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YOW - STL

$259 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 7/19. 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
0 bags
Sat 6/1
Sat 6/8

Search 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
In the last 7 days travelers have searched 43,740,974 times on KAYAK, and here is why:

Save 22% or moreCompare multiple travel sites with one search.

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Filter your dealsChoose cabin class, free Wi-Fi and more.

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Cheap flight deals 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 and deals for you by selecting your travel dates.
Choose your dates
5:59 pm - 10:56 pmYOW-STL
5h 57m1 stop
6:02 am - 12:42 pmSTL-YOW
5h 40m1 stop
$571United Airlines
Find Deal
Sat, Sep 7 - Wed, Sep 11
11:25 am - 3:49 pmYOW-STL
5h 24m1 stop
9:30 am - 9:49 pmSTL-YOW
11h 19m1 stop
$572United Airlines
Find Deal
Sat, Sep 7 - Wed, Sep 11
6:05 am - 11:34 amYOW-STL
6h 29m1 stop
6:02 am - 12:42 pmSTL-YOW
5h 40m1 stop
$589United Airlines
Find Deal
Thu, Sep 5 - Mon, Sep 9
5:55 am - 3:49 pmYOW-STL
10h 54m2 stops
11:10 am - 9:49 pmSTL-YOW
9h 39m1 stop
$593Air Canada
Find Deal
Sat, Sep 7 - Wed, Sep 11
8:10 am - 3:49 pmYOW-STL
8h 39m2 stops
9:30 am - 5:11 pmSTL-YOW
6h 41m1 stop
$594Air Canada
Find Deal
Sat, Sep 7 - Wed, Sep 11
7:30 pm - 10:07 amYOW-STL
15h 37m2 stops
4:05 pm - 11:43 pmSTL-YOW
6h 38m1 stop
Thu, Sep 5 - Mon, Sep 9
7:30 pm - 2:48 pmYOW-STL
20h 18m2 stops
11:09 am - 9:55 pmSTL-YOW
9h 46m1 stop
$612United Airlines
Find Deal
Fri, Sep 27 - Sun, Sep 29
6:05 am - 9:28 pmYOW-STL
16h 23m2 stops
5:20 pm - 12:42 pmSTL-YOW
18h 22m2 stops
$659United Airlines
Find Deal
Thu, Sep 5 - Mon, Sep 9
8:05 am - 6:29 pmYOW-STL
11h 24m2 stops
9:45 am - 3:29 pmSTL-YOW
28h 44m3 stops
Thu, Sep 5 - Mon, Sep 9
3:25 pm - 9:31 pmYOW-STL
31h 06m2 stops
11:51 am - 8:50 pmSTL-YOW
31h 59m2 stops
$768WestJet
Find Deal
Fri, Sep 27 - Sun, Sep 29

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

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

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

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 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 March, where tickets cost $498 on average. On the other hand, the most expensive months are May and February, where the average cost of tickets is $831 and $705 respectively.

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

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from Ottawa to St. Louis, removes the top 0.1% to account for outliers, and then takes the average of all the values for each month.
To get a below average price on the flight from Ottawa to St. Louis, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 75 days before departure.

Which airlines provide the cheapest flights from Ottawa to St. Louis?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
The cheapest return flight ticket from Ottawa to St. Louis found by KAYAK users in the last 72 hours was for $571 on United Airlines, followed by Air Canada ($593). One-way flight deals have also been found from as low as $321 on WestJet and from $327 on Air Canada.

Good to know

Low season

February

High season

December

Cheapest flight

$259
Best time to beat the crowds but there is an average 20% increase in price.
Most popular time to fly with an average 2% increase in price.
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 $259 for a one-way ticket and $571 for a round-trip.

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

    Yes

  • 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. Booking your flights between Ottawa and STL 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 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.

See more FAQs

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.
7.0
Air CanadaOverall score based on 6891 reviews
7.0Comfort
7.8Crew
6.8Entertainment
7.2Boarding
6.2Food
Airline reviews

It was an excellent experience, traveling from Toronto to Denver with United.

10.0 ExcellentJoshua, Apr 2024YYZ - DEN
Read more about Air Canada reviews

It was an excellent experience, traveling from Toronto to Denver with United.

Ontime boarding. Almost 1 hour take off delay. We could have boarded slightly later since the pilots were in traffic

This was the first AC flight in a long time that we experienced no delays or frustrations. The gate attendant was extremely polite and accommodating to my husband who has Parkinson’s disease which made boarding extremely stress free. Flight departed ON TIME and was a smooth ride. If only all my AC experiences could be like this.

I didn’t like the fact that all the customs officers went to lunch so I was in line for 90 minutes due to where the staff directed me. We were told three very different reasons for why the plane was delayed. It was a crowded plane with difficult storage situations for the Carry On bags. The Air Canada airline staff were all very good and professional. I was so disappointed in my cheese and fruit box as the cheese had molded and the fruit wasn’t fresh so I couldn’t eat the majority of the food. This was the last meal I could find as the restaurants had closed when I got in to my destination. I think you could work on improving the food quality.

Once again my complaint is how close the seats are together. Also, the bathrooms were not very clean by the second half of the flight.

Excellent in flight service, perhaps the best we've ever had. Business class feels tired and needs improvement to compete with other airlines. The food looked good but tasted terrible. Check in was quick, the flight arrived early and our luggage was on our flight with us.

The staff were so kind and helpful. We flew back from NY with another airline and it was horrible. We will always stick with Air Canada as everything was far better!

The boarding process in Toronto bad as they share space with domestic flights and when those domestic flights come in you are locked out behind closed doors until they are done and then its a mad rush to get your boarding gates and board. This is not so much due to Air Canada but with the GTAA, but Air Canada could use different gates especially early morning in order to prevent such travel angst.

Terrible quality wifi and they charge a lot for it. They nickel and dime you for everything.

Not happy with Air Canada . Flight was cancelled got the run around trying to get another flight that was direct none to be found ended up going to Denver then onto Austin adding 7 hours to our trip. Was travelling with some one who had walking issues that’s why we were happy to have a direct flight then it didn’t happen adding more stress on her

Book cheap flights from Ottawa to St. Louis

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Ottawa to St. Louis found on KAYAK in the last 72 hours.
7/19Fri
1 stop
19h 19mYOW-STL
$259
6/8Sat
1 stop
15h 53mYOW-STL
$277
6/8Sat
3 stops
29h 02mYOW-STL
$284
6/8Sat
2 stops
25h 17mYOW-STL
$300
9/9Mon
2 stops
15h 09mYOW-STL
$302
7/19Fri
2 stopsWestJet
13h 51mYOW-STL
$321
9/9Mon
1 stopAir Canada
7h 00mYOW-STL
$327
7/19Fri
3 stops
16h 39mYOW-STL
$359
9/9Mon
3 stops
19h 55mYOW-STL
$393

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Ottawa - St. Louis Flights

Departure:

Ottawa (YOW)Canada

Destination:

St. Louis (STL)United States

Return flight deals:

St. Louis - Ottawa

Cabin classes: