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Cheap flights from St. Louis to Toronto from C$ 173

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 8/4. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YTO
2 Apr — 9 Apr1
1 adult

Cheapflights Tip: The best prices from Lambert-St Louis to Toronto are usually found in May or August, booked 52 days in advance, depart on a Wednesday or Monday and return on a Tuesday

Cheap flight deals from St. Louis to Toronto

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Toronto (YTO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 28 March 2025.

Round-trip from

C$ 450

One-way from

C$ 173

Popular in

March

Cheapest in

May

Average price

C$ 833

Good round-trip deal

C$ 312 or less

Good one-way deal

C$ 238 or less
8/5-12/5
  • 8/5-12/5
  • 3 total stops
  • 37h 31m total
  • St. Louis to Toronto
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8/4
  • 8/4
  • 1 total stop
  • 17h 48m total
  • St. Louis to Toronto
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Highest demand for flights based on searches. 5% potential increase in price (C$ 45 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease (C$ 36 potential savings vs. average RT price).
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Average for round-trip flights in March 2025
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Price to beat on a round-trip flight from Lambert-St Louis to Toronto (YTO).
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Price to beat on a one-way flight from Lambert-St Louis to Toronto (YTO).
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Find flight deals from St. Louis to Toronto

Cheapest flights from St. Louis to Toronto
Explore the most affordable flight options available from St. Louis to Toronto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 28 March 2025.

Thu 8/510:10 a.m.STL - YYZ
1 stop9h 50mMultiple Airlines
Mon 12/54:00 p.m.YYZ - STL
2 stops27h 41mMultiple Airlines
Deal found 26/3C$ 450
Thu 8/56:00 a.m.STL - YYZ
1 stop9h 10mDelta
Mon 12/510:20 a.m.YYZ - STL
1 stop8h 42mDelta
Deal found 26/3C$ 552
Tue 6/56:00 a.m.STL - YYZ
1 stop7h 30mAmerican Airlines
Wed 7/511:32 a.m.YYZ - STL
1 stop11h 20mAmerican Airlines
Deal found 27/3C$ 620
Thu 24/46:30 a.m.STL - YYZ
1 stop4h 19mAir Canada
Wed 30/41:40 p.m.YYZ - STL
Nonstop2h 09mAir Canada
Deal found 25/3C$ 679
Tue 22/45:35 p.m.STL - YYZ
1 stop21h 11mUnited Airlines
Thu 24/47:00 a.m.YYZ - STL
1 stop8h 42mUnited Airlines
Deal found 27/3C$ 696
Thu 1/56:00 a.m.STL - YYZ
2 stops11h 04mWestJet
Sun 4/511:34 a.m.YYZ - STL
1 stop4h 37mWestJet
Deal found 27/3C$ 815

Cheapflights Fare Finder

Customize your flight search to find flights from St. Louis to Toronto that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 28 March 2025.
Use the filters below to find and compare flights from St. Louis to Toronto that are best for you.

Fly from

St. Louis

Fly to

Toronto

Route

Depart

Return

Price

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 8/5

10:10 a.m.-9:00 p.m.

1 stop9h 50m

Toronto Pearson Intl

Mon 12/5

4:00 p.m.-6:41 p.m.

2 stops27h 41m

C$ 450

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 8/5

6:00 a.m.-4:10 p.m.

1 stop9h 10m

Toronto Pearson Intl

Mon 12/5

10:20 a.m.-6:02 p.m.

1 stop8h 42m

C$ 552

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 6/5

6:00 a.m.-2:30 p.m.

1 stop7h 30m

Toronto Pearson Intl

Wed 7/5

11:32 a.m.-9:52 p.m.

1 stop11h 20m

C$ 620

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 24/4

6:30 a.m.-11:49 a.m.

1 stop4h 19m

Toronto Pearson Intl

Wed 30/4

1:40 p.m.-2:49 p.m.

Nonstop2h 09m

C$ 679

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 22/4

5:35 p.m.-3:46 p.m.

1 stop21h 11m

Toronto Pearson Intl

Thu 24/4

7:00 a.m.-2:42 p.m.

1 stop8h 42m

C$ 696

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 1/5

6:00 a.m.-6:04 p.m.

2 stops11h 04m

Toronto Pearson Intl

Sun 4/5

11:34 a.m.-3:11 p.m.

1 stop4h 37m

C$ 815

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Sat 19/4

6:44 a.m.-3:00 p.m.

1 stop31h 16m

Toronto Pearson Intl

Fri 25/4

4:45 p.m.-10:28 p.m.

2 stops30h 43m

C$ 1,109

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Wed 9/4

4:57 p.m.-9:58 a.m.

1 stop16h 01m

C$ 200

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 24/4

6:08 a.m.-4:10 p.m.

1 stop9h 02m

C$ 233

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Wed 23/4

6:30 a.m.-3:46 p.m.

1 stop8h 16m

C$ 310

Flights are sorted by cheapest round-trip flights first.

Deals found on 25/3

Showing 1-10 of 12 results
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Best time to book a flight from St. Louis to Toronto

Have a flexible travel schedule? Discover the best time to fly to Toronto 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.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Toronto

How far ahead should I book a flight from St. Louis to Toronto?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Toronto. Price data was last updated on 21 March 2025.

Booking 52 days in advance of your planned departure date is, on average, the best time to get cheap flights from St. Louis to Toronto. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from St. Louis to Toronto?

Currently, January is the cheapest month in which you can book a flight from St. Louis to Toronto (average of C$ 167). Flying from St. Louis to Toronto 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 YTO?

Find hourly flight availability from St. Louis to Toronto. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 28 March 2025.

One of the essential ways to save on airfare from St. Louis to Toronto is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 67% on airfare.

Rainfall in Toronto by month

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

In terms of precipitation, rainfall in Toronto 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 Toronto when rainfall is around 51.0 mm.

Temperature in Toronto by month

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

If weather is an important factor for your trip to Toronto, 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 Toronto

Get insights into the airlines that provide service to Toronto. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Toronto. Reviews last updated 28 March 2025.
Get a feel of what it's like to fly with Alaska Airlines, Delta and United Airlines from St. Louis to Toronto by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,798 reviews
Check prices

Comfort

7.9

Crew

8.5

Food

7.1

Boarding

8.2

Entertainment

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
9,798 reviews
Alaska Airlines
8.0
Very good
9,798 reviews
Check prices

Comfort

7.9

Crew

8.5

Food

7.1

Boarding

8.2

Entertainment

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,897 reviews
Alaska Airlines
8.0
Very good
9,798 reviews
Check prices

Comfort

7.9

Crew

8.5

Food

7.1

Boarding

8.2

Entertainment

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
United Airlines
7.4
Good
8,603 reviews
Alaska Airlines
8.0
Very good
9,798 reviews
Check prices

Comfort

7.9

Crew

8.5

Food

7.1

Boarding

8.2

Entertainment

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
9,798 reviews
Check prices

Comfort

7.9

Crew

8.5

Food

7.1

Boarding

8.2

Entertainment

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
WestJet
7.2
Good
2,785 reviews
Alaska Airlines
8.0
Very good
9,798 reviews
Check prices

Comfort

7.9

Crew

8.5

Food

7.1

Boarding

8.2

Entertainment

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Toronto. 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 Toronto?

    Most people fly from Lambert-St Louis (STL) if they book a flight from St. Louis to Toronto. On average, Lambert-St Louis has 1 outbound flight to Toronto per day from 1 airline. Lambert-St Louis is conveniently located just 20.4 km from St. Louis’s city centre.

  • What are the cheapest airlines flying from St. Louis to Toronto round-trip?

    Our cheapest airline available from St. Louis to Toronto is Delta. Our recent data shows that you can find tickets from as low as C$ 552 on this airline. Additional options worth looking into are American Airlines and Air Canada, starting at C$ 620 and C$ 679 round-trip. Users have found that Delta is 2% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from St. Louis to Toronto one-way?

    For one-way options, check prices for American Airlines. According to our data, you can fly for as low as C$ 270. Users have also found prices from C$ 280 and C$ 310 on Delta and United Airlines, respectively.

  • What are the most reliable airlines from St. Louis to Toronto?

    Consider Air Canada (71%), Jazz (71%) or United Airlines (71%) when booking your flight. These represent the most reliable airlines when flying from St. Louis to Toronto.

  • What are the cheapest flights from St. Louis to Toronto?

    While on average a flight from St. Louis to Toronto is generally C$ 466, our data shows the cheapest flight currently is C$ 198. When looking at the most popular route, (Lambert-St Louis - Toronto Pearson Intl), you can expect to pay C$ 456 for that flight.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from St. Louis to Toronto 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 Toronto?

    Currently, January is the cheapest month in which you can book a flight from St. Louis to Toronto (average of C$ 167). Flying from St. Louis to Toronto 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

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Top airline flying from St. Louis to Toronto

Discover the top airline that operate flights from St. Louis to Toronto. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 28 March 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 312AverageC$ 802FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

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

Deals for St. Louis to Toronto flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

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

Cheapflights simply makes it quick and affordable to book flights from St. Louis to Toronto by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

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Yes! Cheapflights helps users easily find flights from St. Louis to Toronto with no change fees.

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

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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