What are the cheapest airlines to fly from St. Louis to Region of Ontario one-way?

For one-way options, check prices for Air Canada. According to our data, you can fly for as low as C$ 404. Users have also found prices from C$ 621 and C$ 648 on WestJet and American Airlines, respectively.

What are the most popular routes from St. Louis to Region of Ontario?

The most popular flight routes from St. Louis to Region of Ontario are Lambert-St Louis - Toronto Pearson Intl, Lambert-St Louis - Montreal Pierre Elliott Trudeau Intl and Lambert-St Louis - London.

What are the most reliable airlines from St. Louis to Region of Ontario?

Before booking your flight to Region of Ontario from St. Louis, check out the most reliable airlines to get you to your destination on time: Air Canada (91%), Jazz (91%), United Airlines( 91%).

How far in advance should I book a flight from St. Louis to Region of Ontario?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 24 days in advance, which can save you up to 128% on flights from St. Louis to Region of Ontario compared to booking the week you need them. Waiting 24 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at C$ 365. For sooner than that we have options available in the next 3 days from C$ 660.

What is the cheapest month to fly from St. Louis to Region of Ontario?

March is one of the best times of the year to fly to Region of Ontario from St. Louis. Prices for March average C$ 505 per person but you can even find prices for as low as C$ 245. The most expensive prices can be found in the month of February. Opting for a March flight can save you 81% on your journey compared to booking in February

What airport do you fly from for flights from St. Louis to Ontario?

If you book a flight to Ontario from St. Louis, you will be flying from Lambert-St Louis, which is the city’s only airport. Lambert-St Louis (STL) is located 20.4 km from the centre of St. Louis.

Can I find deals for flights from St. Louis to Ontario that include hotel bookings?

Yes. In addition to deals on St. Louis to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from St. Louis to Ontario?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Ontario.

Can I find deals for business class flights from St. Louis to Ontario?

Yes. Cheapflights offers flight deals from St. Louis to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

C$ 166+ Flights from St. Louis, Missouri to Ontario

Find flight deals from St. Louis to Ontario

Cheapest flights from St. Louis to Ontario
Explore the most affordable flight options available from St. Louis to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 4 November 2024.

Tue 19/115:29 p.m.STL - YYZ

1 stop20h 48mMultiple Airlines

Wed 20/118:00 p.m.YYZ - STL

1 stop22h 41mMultiple Airlines

Deal found 3/11C$ 430

Mon 9/128:34 p.m.STL - YUL

1 stop19h 01mMultiple Airlines

Thu 12/125:35 p.m.YUL - STL

1 stop26h 59mMultiple Airlines

Deal found 4/11C$ 463

Tue 19/115:34 p.m.STL - YYZ

1 stop5h 25mWestJet

Wed 20/116:30 a.m.YYZ - STL

2 stops29h 10mWestJet

Deal found 3/11C$ 632

Mon 23/125:03 a.m.STL - YYZ

1 stop12h 26mBritish Airways

Fri 27/126:20 p.m.YYZ - STL

1 stop4h 59mBritish Airways

Deal found 2/11C$ 759

Thu 28/117:00 a.m.STL - YYZ

1 stop30h 55mAlaska Airlines

Sun 8/124:20 p.m.YYZ - STL

1 stop22h 04mAlaska Airlines

Deal found 3/11C$ 766

Mon 23/128:00 a.m.STL - YYZ

1 stop4h 42mAir Canada

Fri 27/121:50 p.m.YYZ - STL

Nonstop2h 16mAir Canada

Deal found 2/11C$ 780

Thu 28/113:50 p.m.STL - YYZ

Nonstop1h 55mUnited Airlines

Sun 8/121:50 p.m.YYZ - STL

Nonstop2h 16mUnited Airlines

Deal found 3/11C$ 814

Fri 13/127:17 a.m.STL - YYZ

1 stop10h 07mAmerican Airlines

Tue 14/17:00 a.m.YYZ - STL

1 stop8h 58mAmerican Airlines

Deal found 4/11C$ 827

Mon 9/126:01 a.m.STL - YUL

1 stop8h 37mDelta

Thu 12/126:05 a.m.YUL - STL

1 stop9h 55mDelta

Deal found 4/11C$ 827

Tue 3/123:30 p.m.STL - YYZ

1 stop6h 25mDelta

Tue 10/126:30 a.m.YYZ - STL

2 stops11h 41mDelta

Deal found 3/11C$ 838

Fri 6/125:06 p.m.STL - YUL

1 stop15h 59mAmerican Airlines

Mon 9/1210:59 a.m.YUL - STL

2 stops12h 06mAmerican Airlines

Deal found 3/11C$ 901

Tue 26/116:30 a.m.STL - YUL

1 stop4h 30mWestJet

Tue 3/127:10 a.m.YUL - STL

1 stop7h 05mWestJet

Deal found 2/11C$ 1,049

Best flights from St. Louis to Ontario
Discover carefully curated flight deals from St. Louis to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 4 November 2024.

Tue 19/115:29 p.m.STL - YYZ

1 stop20h 48mMultiple Airlines

Wed 20/118:00 p.m.YYZ - STL

1 stop22h 41mMultiple Airlines

Deal found 3/11C$ 430

Tue 19/115:34 p.m.STL - YYZ

1 stop5h 25mWestJet

Wed 20/116:30 a.m.YYZ - STL

2 stops29h 10mWestJet

Deal found 3/11C$ 632

Mon 23/125:03 a.m.STL - YYZ

1 stop12h 26mBritish Airways

Fri 27/126:20 p.m.YYZ - STL

1 stop4h 59mBritish Airways

Deal found 2/11C$ 759

Mon 10/22:49 p.m.STL - YYZ

1 stop23h 16mAlaska Airlines

Wed 19/24:10 p.m.YYZ - STL

1 stop32h 49mAlaska Airlines

Deal found 4/11C$ 774

Mon 23/128:00 a.m.STL - YYZ

1 stop4h 42mAir Canada

Fri 27/121:50 p.m.YYZ - STL

Nonstop2h 16mAir Canada

Deal found 2/11C$ 780

Wed 8/11:35 p.m.STL - YYZ

1 stop9h 07mDelta

Sat 11/16:15 a.m.YYZ - STL

2 stops11h 38mDelta

Deal found 4/11C$ 788

Thu 28/113:50 p.m.STL - YYZ

Nonstop1h 55mUnited Airlines

Sun 8/121:50 p.m.YYZ - STL

Nonstop2h 16mUnited Airlines

Deal found 3/11C$ 814

Fri 13/125:05 a.m.STL - YYZ

1 stop5h 09mAmerican Airlines

Tue 14/110:54 a.m.YYZ - STL

1 stop10h 15mAmerican Airlines

Deal found 3/11C$ 827

Mon 9/128:34 p.m.STL - YUL

1 stop19h 01mMultiple Airlines

Thu 12/125:35 p.m.YUL - STL

1 stop26h 59mMultiple Airlines

Deal found 4/11C$ 463

Mon 9/126:01 a.m.STL - YUL

1 stop8h 37mDelta

Thu 12/126:05 a.m.YUL - STL

1 stop9h 55mDelta

Deal found 4/11C$ 827

Fri 6/125:06 p.m.STL - YUL

1 stop15h 59mAmerican Airlines

Mon 9/1210:59 a.m.YUL - STL

2 stops12h 06mAmerican Airlines

Deal found 3/11C$ 901

Fri 6/128:05 a.m.STL - YUL

2 stops8h 40mUnited Airlines

Mon 9/128:25 a.m.YUL - STL

2 stops8h 09mUnited Airlines

Deal found 4/11C$ 969

Direct flights from St. Louis to Ontario
Explore direct flight options from St. Louis to Ontario based on user searches, and compare prices and availability for your desired travel dates. Data last updated 4 November 2024.

Thu 28/113:50 p.m.STL - YYZ

Nonstop1h 55mUnited Airlines

Sun 8/121:50 p.m.YYZ - STL

Nonstop2h 16mUnited Airlines

Deal found 4/11C$ 814

Fri 6/123:50 p.m.STL - YYZ

Nonstop1h 55mAir Canada

Mon 9/121:50 p.m.YYZ - STL

Nonstop2h 16mAir Canada

Deal found 4/11C$ 817

Tue 3/123:50 p.m.STL - YYZ

Nonstop1h 55mMultiple Airlines

Fri 6/121:50 p.m.YYZ - STL

Nonstop2h 16mMultiple Airlines

Deal found 4/11C$ 883

Last-minute flights from St. Louis to Ontario
Discover last-minute flight deals from St. Louis to Ontario. Data last updated 4 November 2024 and is based on user searches.

Wed 13/115:27 p.m.STL - YUL

2 stops20h 13mMultiple Airlines

Sun 17/116:30 a.m.YUL - STL

1 stop11h 04mMultiple Airlines

Deal found 3/11C$ 837

Wed 13/116:30 a.m.STL - YYZ

2 stops10h 16mUnited Airlines

Sat 16/116:15 a.m.YYZ - STL

2 stops14h 36mUnited Airlines

Deal found 4/11C$ 1,283

Thu 14/115:29 p.m.STL - YYZ

1 stop29h 26mMultiple Airlines

Sat 16/117:05 a.m.YYZ - STL

1 stop10h 29mMultiple Airlines

Deal found 4/11C$ 565

Thu 14/1110:00 a.m.STL - YYZ

1 stop10h 29mAmerican Airlines

Sat 16/111:14 p.m.YYZ - STL

1 stop7h 24mAmerican Airlines

Deal found 4/11C$ 1,118

Thu 14/1110:21 a.m.STL - YYZ

2 stops12h 13mWestJet

Fri 15/117:00 p.m.YYZ - STL

2 stops17h 45mWestJet

Deal found 4/11C$ 1,198

Thu 14/116:30 a.m.STL - YYZ

1 stop5h 01mAir Canada

Thu 21/111:50 p.m.YYZ - STL

Nonstop2h 16mAir Canada

Deal found 3/11C$ 1,293

Thu 14/1112:45 p.m.STL - YYZ

1 stop7h 02mDelta

Thu 21/1110:20 a.m.YYZ - STL

2 stops11h 29mDelta

Deal found 3/11C$ 1,304

Tue 19/115:29 p.m.STL - YYZ

1 stop20h 48mMultiple Airlines

Wed 20/118:00 p.m.YYZ - STL

1 stop22h 41mMultiple Airlines

Deal found 3/11C$ 430

Tue 19/115:34 p.m.STL - YYZ

1 stop5h 25mWestJet

Wed 20/116:30 a.m.YYZ - STL

2 stops29h 10mWestJet

Deal found 3/11C$ 632

Sat 23/1111:20 a.m.STL - YYZ

1 stop9h 09mAmerican Airlines

Sun 24/116:15 a.m.YYZ - STL

1 stop5h 50mAmerican Airlines

Deal found 3/11C$ 870

Tue 26/116:30 a.m.STL - YUL

1 stop4h 30mWestJet

Tue 3/127:10 a.m.YUL - STL

1 stop7h 05mWestJet

Deal found 2/11C$ 1,049

Wed 27/113:50 p.m.STL - YYZ

Nonstop1h 55mAir Canada

Sat 30/1111:00 a.m.YYZ - STL

1 stop5h 39mAir Canada

Deal found 3/11C$ 840

One-way flights from St. Louis to Ontario
Search for one-way flight options from St. Louis to Ontario. Find affordable one-way fares based on user searches. Data last updated 4 November 2024.

Tue 3/125:02 p.m.STL - YYZ

1 stop20h 22mMultiple Airlines

Deal found 3/11C$ 166

Tue 3/125:21 p.m.STL - YUL

1 stop23h 14mMultiple Airlines

Deal found 4/11C$ 202

Mon 16/123:50 p.m.STL - YYZ

Nonstop1h 55mAir Canada

Deal found 4/11C$ 404

Thu 26/126:25 a.m.STL - YUL

1 stop9h 54mAir Canada

Deal found 3/11C$ 527

Thu 26/126:04 a.m.STL - YUL

2 stops17h 36mWestJet

Deal found 3/11C$ 621

Mon 11/117:38 a.m.STL - YYZ

1 stop6h 22mAmerican Airlines

Deal found 3/11C$ 648

Mon 11/116:00 a.m.STL - YYZ

1 stop5h 59mDelta

Deal found 4/11C$ 651

Sat 16/113:50 p.m.STL - YYZ

Nonstop1h 55mUnited Airlines

Deal found 4/11C$ 727

Find flights from St. Louis to Ontario within your budget

Fly from

Fly to

Route

Depart

Return

Price

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 3/12

5:02 p.m.-2:24 p.m.

1 stop20h 22m

C$ 166

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 3/12

5:21 p.m.-5:35 p.m.

1 stop23h 14m

C$ 202

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Mon 16/12

3:50 p.m.-6:45 p.m.

Nonstop1h 55m

C$ 404

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 2/1

6:15 a.m.-4:38 p.m.

1 stop9h 23m

C$ 410

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 2/1

8:00 a.m.-6:57 p.m.

2 stops9h 57m

C$ 424

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 26/12

6:04 a.m.-12:40 a.m.

2 stops17h 36m

C$ 621

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Mon 11/11

6:00 a.m.-12:59 p.m.

1 stop5h 59m

C$ 651

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 26/12

6:25 a.m.-5:19 p.m.

1 stop9h 54m

C$ 527

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 19/11

5:29 p.m.-3:17 p.m.

1 stop20h 48m

Toronto Pearson Intl

Wed 20/11

8:00 p.m.-5:41 p.m.

1 stop22h 41m

C$ 430

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 19/11

5:34 p.m.-11:59 p.m.

1 stop5h 25m

Toronto Pearson Intl

Wed 20/11

6:30 a.m.-10:40 a.m.

2 stops29h 10m

C$ 632

Flights are sorted by cheapest first

Deals found on 3/11

Showing 1-10 of 23 results

Best time to book a flight from St. Louis to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from St. Louis with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Travel insights for flights from St. Louis to Ontario

Get recent, data-driven insights about flights from St. Louis to Ontario including ideal travel times, pricing trends, and more.

What is the cheapest month to book a flight from St. Louis to Region of Ontario?

Currently, October is the cheapest month in which you can book a flight from St. Louis to Region of Ontario (average of C$ 178). Flying from St. Louis to Region of Ontario in July is currently the most expensive (average of C$ 258). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from STL to ON?

When flying from St. Louis to Region of Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from St. Louis to Region of Ontario

The most flights from STL to CAON are scheduled on a Monday (2 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (2 on average).

Rainfall in Ontario by month

In terms of precipitation, rainfall in Region of Ontario ranges from 51.0 - 83.0 mm per month. June is typically the wettest month, when rainfall can reach 83.0 mm. February is typically the driest time to visit Region of Ontario when rainfall is around 51.0 mm.

Temperature in Ontario by month

If weather is an important factor for your trip to Region of Ontario, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 21.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -6.0 C).

Reviews of airlines servicing Ontario

Read through reviews of airlines operating flights from St. Louis to Ontario, such as American Airlines, United Airlines and Delta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Alaska Airlines

8.0

Very good

9,423 reviews

Check prices

Reviews

1 / 10

Service was good. We pre-ordered a snack but never made it to us.

Alaska Airlines

8.0

Very good

9,423 reviews

Alaska Airlines

8.0

Very good

9,423 reviews

Check prices

Reviews

1 / 10

Service was good. We pre-ordered a snack but never made it to us.

Delta

8.0

Very good

8,829 reviews

Alaska Airlines

8.0

Very good

9,423 reviews

Check prices

Reviews

1 / 10

Service was good. We pre-ordered a snack but never made it to us.

United Airlines

7.4

Good

9,226 reviews

Alaska Airlines

8.0

Very good

9,423 reviews

Check prices

Reviews

1 / 10

Service was good. We pre-ordered a snack but never made it to us.

WestJet

7.3

Good

2,803 reviews

Alaska Airlines

8.0

Very good

9,423 reviews

Check prices

Reviews

1 / 10

Service was good. We pre-ordered a snack but never made it to us.

American Airlines

7.2

Good

10,000 reviews

Alaska Airlines

8.0

Very good

9,423 reviews

Check prices

Reviews

1 / 10

Service was good. We pre-ordered a snack but never made it to us.

Related info for your journey

What airport do you fly from for flights from St. Louis to Ontario?
If you book a flight to Ontario from St. Louis, you will be flying from Lambert-St Louis, which is the city’s only airport. Lambert-St Louis (STL) is located 20.4 km from the centre of St. Louis.
What are the cheapest airlines to fly from St. Louis to Region of Ontario one-way?
For one-way options, check prices for Air Canada. According to our data, you can fly for as low as C$ 404. Users have also found prices from C$ 621 and C$ 648 on WestJet and American Airlines, respectively.
What are the most popular routes from St. Louis to Region of Ontario?
The most popular flight routes from St. Louis to Region of Ontario are Lambert-St Louis - Toronto Pearson Intl, Lambert-St Louis - Montreal Pierre Elliott Trudeau Intl and Lambert-St Louis - London.
What are the most reliable airlines from St. Louis to Region of Ontario?
Before booking your flight to Region of Ontario from St. Louis, check out the most reliable airlines to get you to your destination on time: Air Canada (91%), Jazz (91%), United Airlines( 91%).
Can I find deals for flights from St. Louis to Ontario that include hotel bookings?
Yes. In addition to deals on St. Louis to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from St. Louis to Ontario?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Ontario.
Can I find deals for business class flights from St. Louis to Ontario?
Yes. Cheapflights offers flight deals from St. Louis to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from St. Louis to Region of Ontario?
Currently, October is the cheapest month in which you can book a flight from St. Louis to Region of Ontario (average of C$ 178). Flying from St. Louis to Region of Ontario in July is currently the most expensive (average of C$ 258). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for St. Louis to Ontario

Complete your trip

Region of Ontario car rentals

Toronto Pearson Intl Airport car rentals

Ottawa Airport car rentals

Toronto Island Airport car rentals

London Airport car rentals

Hamilton Airport car rentals

Toronto Region of Waterloo Intl Airport car rentals

Thunder Bay Airport car rentals

Sault Ste Marie Airport car rentals

Timmins Airport car rentals

Kingston Airport car rentals

North Bay Airport car rentals

Direct flights to Canada

Top airline flying from St. Louis to Ontario

Airline	Cheapest	Average	Flexibility	On-time
Air Canada	CheapestC$ 307	AverageC$ 682	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights

Fly with Cheapflights

How does Cheapflights help users find flights from St. Louis to Ontario?

Cheapflights helps you search for flights from St. Louis to Ontario via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from St. Louis to Ontario?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Ontario from St. Louis.

Can Cheapflights find flights from St. Louis to Ontario with no change fees?

Certainly. Search results for flights to Ontario from St. Louis shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from St. Louis to Ontario become cheaper?

Yes! Start tracking prices for St. Louis to Ontario flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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Cheap flights from St. Louis to Ontario from C$ 166

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/12. Fares are subject to change and may not be available on all flights or dates of travel.

Find flight deals from St. Louis to Ontario

Cheapest flights from St. Louis to OntarioExplore the most affordable flight options available from St. Louis to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 4 November 2024.

Explore the most affordable flight options available from St. Louis to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 4 November 2024.

Find flights from St. Louis to Ontario within your budget

Best time to book a flight from St. Louis to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from St. Louis with our price prediction graph.

Travel insights for flights from St. Louis to Ontario

Get recent, data-driven insights about flights from St. Louis to Ontario including ideal travel times, pricing trends, and more.

What is the cheapest month to book a flight from St. Louis to Region of Ontario?

What is the cheapest time of day to fly from STL to ON?

Find hourly flight availability from St. Louis to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 4 November 2024.

Weekly flight availability from St. Louis to Region of Ontario

Explore weekly flight availability from St. Louis to Ontario. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 4 November 2024.

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

Reviews of airlines servicing Ontario

Read through reviews of airlines operating flights from St. Louis to Ontario, such as American Airlines, United Airlines and Delta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly from for flights from St. Louis to Ontario?

What are the cheapest airlines to fly from St. Louis to Region of Ontario one-way?

What are the most popular routes from St. Louis to Region of Ontario?

What are the most reliable airlines from St. Louis to Region of Ontario?

Can I find deals for flights from St. Louis to Ontario that include hotel bookings?

How can I find direct flights from St. Louis to Ontario?

Can I find deals for business class flights from St. Louis to Ontario?

What is the cheapest month to book a flight from St. Louis to Region of Ontario?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for St. Louis to Ontario

See prices for flight routes from nearby airports that may be better suited for you.

Top airline flying from St. Louis to Ontario

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from St. Louis to Ontario?

Why should you use Cheapflights to find cheap flight tickets from St. Louis to Ontario?

Can Cheapflights find flights from St. Louis to Ontario with no change fees?

Can Cheapflights notify me if prices for flights from St. Louis to Ontario become cheaper?

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Cheapest flights from St. Louis to Ontario
Explore the most affordable flight options available from St. Louis to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 4 November 2024.