YOW - STL

C$ 313 Find Cheap Flights from Ottawa to St. Louis

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ottawa to St. Louis departing on 13/9. 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.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to St. Louis

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ottawa to St. Louis, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ottawa to St. Louis, as well as popular online travel agencies
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Flights Deals

Cheap Flights from Ottawa to St. Louis (YOW-STL)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ottawa to St. Louis that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ottawa to St. Louis

Wed, 13 Aug - Thu, 14 Aug
Logo
3:50 p.m. - 9:40 a.m.YOW-STL
18h 50m1 stop
Logo
5:40 p.m. - 5:06 p.m.STL-YOW
22h 26m1 stop
C$ 666
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Thu, 21 Aug - Mon, 25 Aug
Logo
4:25 p.m. - 1:32 p.m.YOW-STL
22h 07m2 stops
Logo
2:30 p.m. - 5:20 p.m.STL-YOW
25h 50m3 stops
C$ 720
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Thu, 21 Aug - Mon, 25 Aug
Logo
4:25 p.m. - 1:32 p.m.YOW-STL
22h 07m2 stops
Logo
3:16 p.m. - 5:06 p.m.STL-YOW
24h 50m1 stop
C$ 752
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Thu, 21 Aug - Mon, 25 Aug
Logo
12:35 p.m. - 1:32 p.m.YOW-STL
25h 57m3 stops
Logo
2:30 p.m. - 5:20 p.m.STL-YOW
25h 50m3 stops
C$ 764
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Tue, 26 Aug - Tue, 2 Sep
United Airlines Logo
6:33 a.m. - 2:33 p.m.YOW-STL
9h 00m1 stop
United Airlines Logo
7:04 p.m. - 2:26 p.m.STL-YOW
18h 22m2 stops
C$ 766United Airlines
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Tue, 26 Aug - Tue, 2 Sep
United Airlines Logo
7:29 p.m. - 10:46 a.m.YOW-STL
16h 17m2 stops
United Airlines Logo
7:04 p.m. - 2:26 p.m.STL-YOW
18h 22m2 stops
C$ 786United Airlines
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Tue, 26 Aug - Tue, 2 Sep
Air Canada Logo
2:25 p.m. - 8:00 p.m.YOW-STL
6h 35m1 stop
Air Canada Logo
9:15 a.m. - 5:04 p.m.STL-YOW
6h 49m1 stop
C$ 843Air Canada
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Mon, 22 Dec - Mon, 5 Jan
United Airlines Logo
5:09 p.m. - 10:43 p.m.YOW-STL
6h 34m1 stop
United Airlines Logo
11:05 a.m. - 9:18 p.m.STL-YOW
9h 13m1 stop
C$ 861United Airlines
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Thu, 21 Aug - Mon, 25 Aug
WestJet Logo
5:55 a.m. - 1:20 p.m.YOW-STL
8h 25m2 stops
WestJet Logo
3:42 p.m. - 12:22 a.m.STL-YOW
7h 40m2 stops
C$ 903WestJet
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Mon, 18 Aug - Sun, 31 Aug
WestJet Logo
5:55 a.m. - 11:14 p.m.YOW-STL
18h 19m2 stops
WestJet Logo
5:11 p.m. - 12:22 a.m.STL-YOW
30h 11m2 stops
C$ 1,037WestJet
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Booking Insights

KAYAK's insights & trends for Ottawa to St. Louis flights

Get data-powered insights and trends into flights from Ottawa to St. Louis to help you find the cheapest flights, the best time to fly and much more.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ottawa to St. Louis, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Ottawa to St. Louis is September, where tickets cost C$ 705 (return) on average. On the other hand, the most expensive months are August and December, where the average cost of round-trip tickets is C$ 1,021 and C$ 1,021 respectively.

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Good to know

Low seasonJune
Cheapest flightC$ 313
Best time to beat the crowds (3% less expensive on average)
Most popular time to fly (6% more expensive on average)
Flight from Ottawa to St. Louis

When to book flights from Ottawa to St. Louis

Are your dates flexible? Find out the best times to travel from Ottawa to St. Louis based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Ottawa to St. Louis

  • What is the cheapest flight from Ottawa to St. Louis?

    In the last 3 days, the lowest price for a flight from Ottawa to St. Louis was C$ 227 for a one-way ticket and C$ 483 for a round-trip.

  • Which airports will I be using when flying from Ottawa to St. Louis?

    Ottawa airport is called Ottawa and the only airport in St. Louis is Lambert-St Louis.

  • Which aircraft models fly most regularly from Ottawa to St. Louis?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Ottawa to St. Louis?

    Star Alliance is the only airline alliance operating flights between Ottawa and St. Louis.

  • How does KAYAK find such low prices on flights from Ottawa to St. Louis?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ottawa to St. Louis.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ottawa to St. Louis?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Ottawa is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ottawa to St. Louis?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to St. Louis with an airline and back to Ottawa with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ottawa to St. Louis?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to St. Louis from Ottawa up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Ottawa to St. Louis

 
See real verified KAYAK customer reviews for airlines flying from Ottawa to St. Louis. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Ottawa to St. Louis? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.1
Air CanadaOverall score based on 9851 reviews
7.8Crew
7.3Boarding
6.8Entertainment
7.1Comfort
6.3Food
Airline reviews

Flight got delayed for no reason. And Air Canada was doing 3 boardings via the same gate. It was chaotic!

2.0 MediocreAnonymous, Jul 2025YYZ - LGA
Read more Air Canada reviews

Flight got delayed for no reason. And Air Canada was doing 3 boardings via the same gate. It was chaotic!

Wonderful airline. All staff were pleasant and helpful. What is sad is that it wasn’t grand gestures just everyday pleasantness and friendliness that are missing from the other airlines I have flown recently.

Friendly efficient crew, but plane had no way to charge phone. That is a near necessity with today’s travel where we carry out travel documents on our phones.

Orlando to Canada, despite being close and an international flight, the plane was not at all comfortable. It felt like the chair was being pushed forward, in addition to not having a TV and having to choose from a tiny glass of drink, for example, water or soda. I couldn't have both. When I asked the flight attendant for an extra glass of water, she looked at me with an ugly face. This is ridiculous. They don't want to give water to passengers. I will never fly with this airline again in my life.

Staff was very courteous and kept things organized. We will definitely use Air Canada for further travel

In a nutshell, my bag, the one I have to pay for, because now you can’t even bring a carry on, did not make it. I am still waiting for an update. The fact that not only were have to pay for it, but on top of that we are stuck without getting it, it’s ridiculous..

Great flights. 90 minute departure delay for maintenance issues, not a great start but, afer that very good. Didn't pay extra for seats and lucked into a window and an aisle seat. Price was excellent at the super low economy level.

This was an excellent experience for a very short flight.

No space in overhead bin, one cookie, 2 oz of juice - is not customer service.

Just a little improvement on food but everything is excellent

Everything you need to know for your flight from Ottawa to St. Louis

Information on your arrival and departure airports

Ottawa (YOW)
St. Louis (STL)

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