STL - YOW

$354 Find Cheap Flights from St. Louis to Ottawa

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Ottawa departing on 3/2. 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.
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These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Ottawa, 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 St. Louis to Ottawa, as well as popular online travel agencies
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Cheap Flight Deals from St. Louis to Ottawa (STL-YOW)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Ottawa 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.

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

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from St. Louis to Ottawa.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
11:08 pm - 4:45 pmSTL-YOW
16h 37m1 stop
4:20 pm - 5:52 pmYOW-STL
26h 32m1 stop
Sun, Mar 2 - Mon, Mar 31
9:50 am - 1:47 pmSTL-YOW
26h 57m3 stops
9:25 am - 5:52 pmYOW-STL
9h 27m1 stop
Fri, Apr 4 - Tue, Apr 8
4:00 pm - 5:40 pmSTL-YOW
24h 40m1 stop
4:25 pm - 5:52 pmYOW-STL
26h 27m2 stops
Sun, Mar 2 - Mon, Mar 31
4:00 pm - 5:40 pmSTL-YOW
24h 40m1 stop
6:15 am - 5:52 pmYOW-STL
36h 37m3 stops
Sun, Mar 2 - Mon, Mar 31
9:39 am - 9:35 pmSTL-YOW
10h 56m1 stop
6:33 am - 2:42 pmYOW-STL
9h 09m1 stop
$792United Airlines
Find Deal
Fri, Apr 4 - Tue, Apr 8
1:30 pm - 8:15 pmSTL-YOW
5h 45m1 stop
10:00 am - 3:16 pmYOW-STL
6h 16m1 stop
$805Air Canada
Find Deal
Thu, Jul 3 - Mon, Jul 7
6:30 am - 2:04 pmSTL-YOW
6h 34m1 stop
5:25 pm - 9:48 pmYOW-STL
5h 23m1 stop
$813United Airlines
Find Deal
Sun, Apr 6 - Sun, Apr 13
1:30 pm - 8:15 pmSTL-YOW
5h 45m1 stop
6:00 am - 3:42 pmYOW-STL
10h 42m2 stops
$814Air Canada
Find Deal
Thu, Jul 3 - Mon, Jul 7
6:30 am - 2:35 pmSTL-YOW
7h 05m2 stops
7:30 pm - 10:08 amYOW-STL
15h 38m1 stop
$815United Airlines
Find Deal
Thu, Mar 13 - Mon, Mar 17
1:10 pm - 10:05 pmSTL-YOW
7h 55m2 stops
6:00 am - 3:42 pmYOW-STL
10h 42m2 stops
$824Air Canada
Find Deal
Thu, Jul 3 - Mon, Jul 7

Flights from St. Louis to Ottawa - Travel Insights & Trends

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

What’s the cheapest day of the week to fly from St. Louis to Ottawa?

The average price of all round-trip flights from St. Louis to Ottawa clicked on KAYAK for each day over the last 12 months.
For St. Louis to Ottawa, Saturday is the cheapest day to fly on average and Monday is the most expensive. Flying from Ottawa back to St. Louis, the best deals are generally found on Wednesday, with Monday being the most expensive.

Good to know

Cheapest flight

$354
Flight from St. Louis to Ottawa

When to book flights from St. Louis to Ottawa

Are your dates flexible? Find out the best times to travel from St. Louis to Ottawa 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 St. Louis to Ottawa

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

    In the last 3 days, the lowest price for a flight from St. Louis to Ottawa was $354 for a round-trip ticket.

  • Do I need a passport to fly between St. Louis and Ottawa?

    Yes, you'll most likely have to show a valid passport before boarding the plane in St. Louis and on arrival in Ottawa.

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

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

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

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

  • Which is the best airline for flights from St. Louis to Ottawa, United Airlines or Air Canada?

    The two airlines most popular with KAYAK users for flights from St. Louis to Ottawa are United Airlines and Air Canada. With an average price for the route of $816 and an overall rating of 7.4, United Airlines is the most popular choice. Air Canada is also a great choice for the route, with an average price of $764 and an overall rating of 7.0.

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

    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 St. Louis to Ottawa.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ottawa from St. Louis 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 St. Louis to Ottawa?

    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 Ottawa with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and YOW can sometimes prove cheaper using this method.

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

    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 Ottawa from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top airlines flying from St. Louis to Ottawa

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Ottawa. 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 St. Louis to Ottawa? 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.
7.4
United AirlinesOverall score based on 8766 reviews
8.1Crew
6.7Food
7.3Comfort
7.7Boarding
7.1Entertainment
Airline reviews

I don’t understand the purpose of the orange “priority” tag on my bag. This tagged, my bag is last or near to the last bag to come down the carousel at IAH.

4.0 OkayDonald, Feb 2025EGE - IAH
Read more United Airlines reviews

I don’t understand the purpose of the orange “priority” tag on my bag. This tagged, my bag is last or near to the last bag to come down the carousel at IAH.

The tv monitor in front of my seat was not responding. The flight crew reset it and it still didn’t work.

The agents was very rude and they charged me $50 for a carry-on bag saying that it was too big and then I saw someone going on a plane with the same size bag as me

Liked nothing. As per previous segment it was delay delay delay.

Terrible. First of all we were delayed 4 3/4 hours departing Honolulu. As we had to leave our condo and the rental car had to be returned we had to go to the airport. Even though we had a business class boarding pass to Washington, since we did not have business class to Montreal we could not access the lounge without paying a $59 fee each. This does not make sense to us. Since we could not meet our original connection United booked us to Montreal via New York LaGuardia on Air Canada. In Washington a further delay got us into LaGuardia too late to make our connection to Montreal so we were booked on another Air Canada flight 3 hours later. We were originally scheduled to arrive in Montreal at 10:40 and arrived at 19:55. A totally exhausting day, United did not offer a meal voucher or any type of compensation. Air Canada did give us a digital meal voucher. The food in United business class is poor among all meals offered. The pods look nice but are not that confortable. Overall would not fly on United again.

Plenty of room for me and the cat in Premium Economy. Seat was comfortable. Boarding was a breeze. The lady at the special check-in desk was great, super helpful and professional.

For the most part united was a good experience, how ever when they came by with the snacks and water, they completely passed by my wife and I. As we were in separate rows. On a 5 hr flight we were not offered water

Fantastic crew. Flight was delayed at last minute but we were given updates every 20 minutes and the crew was so friendly and considerate. I miss the touch screens on the back of the seats, wish they would bring that back though.

Our seats were all the way in back of the plane,

Food choices were very limited. Taste of the dishes was average.

I liked nothing about this flight nor the incredible lack of service and communication on this flight from the Captain to every staff member. Arrogant, entitled and lacking any kind of basic customer service

Everything should be better, terrible flight and airport service. Delayed for 6 hours, flying around for 1 hr, and keeping us on a plane for another 2,5 -3hrs.

I booked my flight ni November and was placed on standby? How does this happen. Flight was 1 1/2 hours late departure plane was switched to a smaller plane easy to tell this is a government run company they don’t care about anyone

Boarding was a disaster one person checking in 200 people took 25 min to check in zone 1&2.

Delayed in Fort Lauderdale 3 hours , gave us $15 coupon for meals at 20:50, when most of the restuarant closed at 21:00.

Most expensive flight… and they are trying to pinch more and more money out of you. Baggage, snacks, pillows, headphones… — so many airlines do far better than this… surely a national airline can do better?

Everything was good till we got to yyz...then we got to the gate and there was NO GATE AGENT. We waited 15 min before disembarking. No internet No IFE Old aircraft Second leg in two weeks NOT IMPRESSED

The flight was delayed at the last moment quoting an absurd weather reason. This delay led to an issue with my connecting flight. I was made to run (literary) from this flight to the next one ( as they preponed departure. I was still in my DCA to YYZ flight when the boarding started for the next connecting flight. After my sprint to get the connecting flight, found that no place for my carry on. Had to sit for 3 hours with my back-pack on my lap , it was the most uncomfortable and inconvenient journey with little to no empathy shown by cabin crew in both flights. Another poor show from Air Canada!! Cant help because of lack of options !!

I was not even asked if I want some water. Joke. Steward gave me a biscuit cover in chocolate and did not even look at me.

Ok Did not like that the second leg of flight was moved earlier making it a rush to make

Traveling to a place near Ottawa?

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