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Cheap flights from Ottawa to St. Louis from C$ 646

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/9. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
YOW — STL
15 May — 22 May1
1 adult
Wed 15/5
Wed 22/5

Cheap flight deals from Ottawa to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Ottawa (YOW) to St. Louis (STL). 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 10 May 2024.

Popular in

January

Cheapest in

October

Average price

C$ 899

Round-trip from

C$ 501
High demand for flights, 28% potential price rise
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Best time to find cheap flights, 16% potential price drop
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Average for round-trip flights in May 2024
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From Ottawa to Lambert-St Louis
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What is the cheapest day to fly round-trip from Ottawa to St. Louis?

Departing on a Sunday is a good option for securing a great price. You can expect to save up to 33% when planning your travel around this day of the week.

How far in advance should I book a flight from Ottawa to St. Louis?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 38 days in advance, which can save you up to 45% on flights from Ottawa to St. Louis compared to booking the week you need them. Waiting 38 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$ 909. For sooner than that we have options available in the next 3 days from C$ 909.

What is the cheapest month to fly from Ottawa to St. Louis?

October is one of the best times of the year to fly to St. Louis from Ottawa. Prices for October average C$ 859 per person but you can even find prices for as low as C$ 650. The most expensive prices can be found in the month of January. Opting for a October flight can save you 38% on your journey compared to booking in January

When is the cheapest time to fly from Ottawa to St. Louis (YOW - STL)?

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

Cheap Air Canada flights from Ottawa to St. Louis

Explore cheap flight options specifically provided by Air Canada for the route between Ottawa and St. Louis. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 437,143 searches. Data last updated 10 May 2024.
Find some of the cheapest Air Canada flights travelling from Ottawa to St. Louis. Make sure to check back often as deals are often changing.
Tue 28/59:20 a.m.YOW - STL
1 stop7h 01mAir Canada
Fri 7/68:05 a.m.STL - YOW
1 stop7h 59mAir Canada
Deal found 9/5C$ 875
Sun 19/56:35 a.m.YOW - STL
1 stop8h 48mAir Canada
Wed 29/58:05 a.m.STL - YOW
1 stop7h 59mAir Canada
Deal found 9/5C$ 909

Cheap United Airlines flights from Ottawa to St. Louis

Explore cheap flight options specifically provided by United Airlines for the route between Ottawa and St. Louis. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 437,143 searches. Data last updated 10 May 2024.
To aid your search, here are some of the cheapest United Airlines flights we've found from Ottawa to St. Louis. Deals frequently update to provide users with more options.
Tue 28/56:00 p.m.YOW - STL
2 stops19h 46mUnited Airlines
Fri 7/68:05 a.m.STL - YOW
1 stop7h 59mUnited Airlines
Deal found 9/5C$ 892
Sun 19/56:05 a.m.YOW - STL
2 stops10h 41mUnited Airlines
Wed 29/58:05 a.m.STL - YOW
1 stop12h 43mUnited Airlines
Deal found 9/5C$ 922
Sun 19/56:05 a.m.YOW - STL
2 stops10h 41mUnited Airlines
Wed 29/58:05 a.m.STL - YOW
2 stops12h 59mUnited Airlines
Deal found 9/5C$ 929

Cheap Ottawa to St. Louis flights in May & June 2024

Find cheap flight options from Ottawa to St. Louis specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 437,143 searches. Prices were last updated on 10 May 2024.
These are some of the most attractive deals on flights from Ottawa to St. Louis in 2024. Check back regularly for other flight deals.
Tue 28/57:50 a.m.YOW - STL
3 stops27h 56mMultiple Airlines
Fri 7/66:10 p.m.STL - YOW
2 stops23h 47mMultiple Airlines
Deal found 9/5C$ 710
Tue 28/56:15 a.m.YOW - STL
2 stops29h 31mMultiple Airlines
Fri 7/66:10 p.m.STL - YOW
2 stops23h 47mMultiple Airlines
Deal found 9/5C$ 739
Tue 28/57:50 a.m.YOW - STL
3 stops27h 56mMultiple Airlines
Fri 7/66:10 p.m.STL - YOW
3 stops24h 14mMultiple Airlines
Deal found 9/5C$ 751
Tue 28/59:20 a.m.YOW - STL
1 stop7h 01mAir Canada
Fri 7/68:05 a.m.STL - YOW
1 stop7h 59mAir Canada
Deal found 9/5C$ 875
Tue 28/56:00 p.m.YOW - STL
2 stops19h 46mUnited Airlines
Fri 7/68:05 a.m.STL - YOW
1 stop7h 59mUnited Airlines
Deal found 9/5C$ 892
Sun 19/56:35 a.m.YOW - STL
1 stop8h 48mAir Canada
Wed 29/58:05 a.m.STL - YOW
1 stop7h 59mAir Canada
Deal found 9/5C$ 909
Sun 19/56:05 a.m.YOW - STL
2 stops10h 41mUnited Airlines
Wed 29/58:05 a.m.STL - YOW
1 stop12h 43mUnited Airlines
Deal found 9/5C$ 922
Sun 19/56:05 a.m.YOW - STL
2 stops10h 41mUnited Airlines
Wed 29/58:05 a.m.STL - YOW
2 stops12h 59mUnited Airlines
Deal found 9/5C$ 929
Sun 19/57:50 a.m.YOW - STL
2 stops11h 50mMultiple Airlines
Wed 29/511:36 a.m.STL - YOW
3 stops24h 03mMultiple Airlines
Deal found 9/5C$ 943

Ottawa to St. Louis 2024 flight deals

Discover exclusive flight deals for travel between Ottawa and St. Louis in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 437,143 searches. Data last updated 10 May 2024.
These are some of the most attractive deals on flights from Ottawa to St. Louis in 2024. Check back regularly for other flight deals.
Sat 7/95:59 p.m.YOW - STL
1 stop5h 57mUnited Airlines
Tue 10/96:02 a.m.STL - YOW
1 stop5h 40mUnited Airlines
Deal found 8/5C$ 646
Sat 7/911:25 a.m.YOW - STL
1 stop5h 24mUnited Airlines
Tue 10/96:02 a.m.STL - YOW
1 stop5h 40mUnited Airlines
Deal found 9/5C$ 647
Sat 7/95:55 a.m.YOW - STL
2 stops10h 54mAir Canada
Tue 10/99:30 a.m.STL - YOW
1 stop11h 19mAir Canada
Deal found 8/5C$ 676
Sat 7/95:55 a.m.YOW - STL
2 stops10h 54mAir Canada
Tue 10/99:30 a.m.STL - YOW
1 stop11h 19mAir Canada
Deal found 9/5C$ 677
Tue 28/57:50 a.m.YOW - STL
3 stops27h 56mMultiple Airlines
Fri 7/66:10 p.m.STL - YOW
2 stops23h 47mMultiple Airlines
Deal found 9/5C$ 710
Tue 28/56:15 a.m.YOW - STL
2 stops29h 31mMultiple Airlines
Fri 7/66:10 p.m.STL - YOW
2 stops23h 47mMultiple Airlines
Deal found 9/5C$ 739
Tue 28/57:50 a.m.YOW - STL
3 stops27h 56mMultiple Airlines
Fri 7/66:10 p.m.STL - YOW
3 stops24h 14mMultiple Airlines
Deal found 9/5C$ 751
Tue 28/59:20 a.m.YOW - STL
1 stop7h 01mAir Canada
Fri 7/68:05 a.m.STL - YOW
1 stop7h 59mAir Canada
Deal found 9/5C$ 875
Tue 28/56:00 p.m.YOW - STL
2 stops19h 46mUnited Airlines
Fri 7/68:05 a.m.STL - YOW
1 stop7h 59mUnited Airlines
Deal found 9/5C$ 892

Ottawa to St. Louis flights leaving soon

Find last-minute flight options from Ottawa to St. Louis for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 437,143 searches. Data last updated 10 May 2024.
Have a look at some of the last-minute flights available departing from Ottawa to St. Louis. It's wise to confirm all flight details are correct before booking.
Sun 19/56:35 a.m.YOW - STL
1 stop8h 48mAir Canada
Wed 29/58:05 a.m.STL - YOW
1 stop7h 59mAir Canada
Deal found 9/5C$ 909
Sun 19/56:05 a.m.YOW - STL
2 stops10h 41mUnited Airlines
Wed 29/58:05 a.m.STL - YOW
1 stop12h 43mUnited Airlines
Deal found 9/5C$ 922
Sun 19/56:05 a.m.YOW - STL
2 stops10h 41mUnited Airlines
Wed 29/58:05 a.m.STL - YOW
2 stops12h 59mUnited Airlines
Deal found 9/5C$ 929
Sun 19/57:50 a.m.YOW - STL
2 stops11h 50mMultiple Airlines
Wed 29/511:36 a.m.STL - YOW
3 stops24h 03mMultiple Airlines
Deal found 9/5C$ 943
Sun 19/58:00 a.m.YOW - STL
3 stops32h 14mMultiple Airlines
Wed 29/511:36 a.m.STL - YOW
3 stops24h 03mMultiple Airlines
Deal found 9/5C$ 969

Find flights from Ottawa to St. Louis within your budget

Customize your flight search to find flights from Ottawa to St. Louis 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 437,143 searches. Data last updated 10 May 2024.

Fly from

Any airport

Fly to

Any airport

Budget

C$ 710 - C$ 943

Route

Depart

Return

Price

OttawaLambert-St Louis

YOW - STL

YOWSTL

Ottawa

Tue 28/5

3 stops27h 56m

Lambert-St Louis

Fri 7/6

2 stops23h 47m

C$ 710

OttawaLambert-St Louis

YOW - STL

YOWSTL

Ottawa

Tue 28/5

2 stops29h 31m

Lambert-St Louis

Fri 7/6

2 stops23h 47m

C$ 739

OttawaLambert-St Louis

YOW - STL

YOWSTL

Ottawa

Tue 28/5

3 stops27h 56m

Lambert-St Louis

Fri 7/6

3 stops24h 14m

C$ 751

OttawaLambert-St Louis

YOW - STL

YOWSTL

Ottawa

Tue 28/5

1 stop7h 01m

Lambert-St Louis

Fri 7/6

1 stop7h 59m

C$ 875

OttawaLambert-St Louis

YOW - STL

YOWSTL

Ottawa

Tue 28/5

2 stops19h 46m

Lambert-St Louis

Fri 7/6

1 stop7h 59m

C$ 892

OttawaLambert-St Louis

YOW - STL

YOWSTL

Ottawa

Sun 19/5

1 stop8h 48m

Lambert-St Louis

Wed 29/5

1 stop7h 59m

C$ 909

OttawaLambert-St Louis

YOW - STL

YOWSTL

Ottawa

Sun 19/5

2 stops10h 41m

Lambert-St Louis

Wed 29/5

1 stop12h 43m

C$ 922

OttawaLambert-St Louis

YOW - STL

YOWSTL

Ottawa

Sun 19/5

2 stops10h 41m

Lambert-St Louis

Wed 29/5

2 stops12h 59m

C$ 929

OttawaLambert-St Louis

YOW - STL

YOWSTL

Ottawa

Sun 19/5

2 stops11h 50m

Lambert-St Louis

Wed 29/5

3 stops24h 03m

C$ 943

Flights are sorted by cheapest first

Deals found on 9/5

When is the best time to book a flight from Ottawa to St. Louis?

Use this chart to determine the optimal time to book a round-trip flight from Ottawa to St. Louis. Price data was last updated on 3 May 2024.
The best time to book flights from Ottawa to St. Louis is 37 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
Search Deals

When is the cheapest time to fly from Ottawa to St. Louis?

Use this chart to determine the cheapest time to fly round-trip from Ottawa to St. Louis. Price data was last updated on 5 May 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Ottawa to St. Louis flight should consider departing on Monday mornings when fares are most often at their lowest. Saturday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
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Average price of flights to St. Louis by month

Plan your trip from Ottawa to St. Louis by taking into account the cheapest months to travel. The average price of a one-way flight from Ottawa to St. Louis is currently C$ 0 while a round-trip flight costs C$ 852. Price data was last updated on 5 May 2024.

Currently, January is the cheapest month in which you can book a flight from Ottawa to St. Louis (average of C$ 365). Flying from Ottawa to St. Louis in July is currently the most expensive (average of C$ 559). 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.

January

C$ 500

February

C$ 550

March

C$ 613

April

C$ 555

May

C$ 589

June

C$ 720

July

C$ 766

August

C$ 622

September

C$ 621

October

C$ 657

November

C$ 552

December

C$ 521

Temperature and rainfall in St. Louis by month

Plan your trip to St. Louis by taking into account the average temperature and rainfall totals by month.

STL

Temperature

0 - 27 °C

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated 10 May 2024.
Read reviews from past customers who have flown Air Canada and United Airlines from Ottawa to St. Louis. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
11,016 reviews
Check prices

Food

6.7

Entertainment

7.1

Boarding

7.7

Overall

7.4

Comfort

7.2

Crew

8.1

Reviews

1 / 10

The staff were pleasant. There was no food or entertainment.

United Airlines
7.4
Good
11,016 reviews
United Airlines
7.4
Good
11,016 reviews
Check prices

Food

6.7

Entertainment

7.1

Boarding

7.7

Overall

7.4

Comfort

7.2

Crew

8.1

Reviews

1 / 10

The staff were pleasant. There was no food or entertainment.

Air Canada
7.0
Good
6,929 reviews
United Airlines
7.4
Good
11,016 reviews
Check prices

Food

6.7

Entertainment

7.1

Boarding

7.7

Overall

7.4

Comfort

7.2

Crew

8.1

Reviews

1 / 10

The staff were pleasant. There was no food or entertainment.

Related info for your journey

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

  • Can I find flights from Ottawa to St. Louis for under C$ 800 on Cheapflights?

    Yes, there are multiple flights from Ottawa to St. Louis for under C$ 800. The cheapest flight booked recently is on Multiple Airlines for just C$ 710, but on average you can expect to pay C$ 864.

  • Are there last-minute flights available from Ottawa to St. Louis for under C$ 1,000?

    There are currently 5+ open flights from Ottawa to St. Louis within the next 7 days for less than C$ 1,000.

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

    Air Canada, at C$ 875, was found to be the cheapest airline from Ottawa to St. Louis. An alternate airline flying to your destination would be United Airlines.

  • What does YOW to STL mean?

    These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Ottawa Airport to Lambert-St Louis Airport flight would often be abbreviated as a YOW to STL flight.

  • Can I find deals for flights from Ottawa to St. Louis that include extra baggage allowance?

    The amount of baggage you can bring on your Ottawa to St. Louis flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Ottawa to St. Louis with specific airlines?

    Yes, Cheapflights allows you to browse and filter Ottawa to St. Louis flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

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

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

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

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

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

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

  • Can I find deals for flights from Ottawa to St. Louis that allow pets onboard?

    Many airlines flying from Ottawa to St. Louis offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Ottawa to St. Louis?

    Yes, you can often find last-minute deals on Ottawa to St. Louis flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Ottawa to St. Louis flight deals updated?

    The Ottawa to St. Louis flight deals you see on this page were last updated on 9/5.

See more FAQs

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Alternative routes for Ottawa to St. Louis
See prices for flight routes from nearby airports that may be better suited for you.

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Top airline flying from Ottawa to St. Louis

Discover the top airline that operate flights from Ottawa to St. Louis. 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 437,143 searches. Data last updated 10 May 2024.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 629AverageC$ 735FlexibilityNo cancel feeOn-time67%
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Search flights from Ottawa to St. Louis by cabin class

Find flights from Ottawa to St. Louis, based on your preferred cabin class, be it economy, premium economy, business, or first class.
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Business Class
Prem Econ Class
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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 Ottawa to St. Louis?

When you search for this flight from Ottawa to St. Louis, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

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

Cheapflights helps you find that perfect flight to St. Louis from Ottawa by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

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

Users can book flights with no change fees policies with our dedicated filters. Book flights from Ottawa to St. Louis flexibly with Cheapflights today.

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

Yes! Start tracking prices for Ottawa to St. Louis 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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