YOW - STL

$187 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 6/7. 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, 0 bags

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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Everything you should know

Cheapest round-trip
$314
Typical prices: $822-$288
Air Canada
Sat 5/23Sun 5/24
YOW - STL • 1 stop
Cheapest one-way
$187
Air Canada
Sun 6/7
YOW - STL • 1 stop
Top airlines
Air Canada
Cheapest • from $314 (round-trip)
Air Canada
Best reviews • 7.1 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Ottawa and St. Louis. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Chicago (ORD)
Cheapest • Avg $508 (round-trip)
Chicago (ORD)
Shortest trip • 5h 15m (one-way)
Insights
Insights
Insights
Insights
When to travel
February
Cheapest • 100% price drop
May
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to St. Louis!
Flight Deals
Booking Insights
Flight 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

Sat, May 23 - Sun, May 24
Air Canada Logo
2:40 pm - 8:25 pm
YOW
-
STL
6h 45m
1 stop
Air Canada Logo
7:05 am - 1:05 pm
STL
-
YOW
5h 00m
1 stop
$314Air Canada
Sat, May 23 - Wed, May 27
United Airlines Logo
5:50 pm - 11:35 pm
YOW
-
STL
6h 45m
1 stop
United Airlines Logo
6:00 am - 4:38 pm
STL
-
YOW
9h 38m
1 stop
$320United Airlines
Tue, Jun 2 - Wed, Jun 3
United Airlines Logo
10:44 am - 9:16 pm
YOW
-
STL
11h 32m
1 stop
United Airlines Logo
6:00 am - 4:38 pm
STL
-
YOW
9h 38m
1 stop
$321United Airlines
Tue, Jun 2 - Wed, Jun 3
United Airlines Logo
6:00 am - 9:16 pm
YOW
-
STL
16h 16m
2 stops
United Airlines Logo
6:00 am - 4:38 pm
STL
-
YOW
9h 38m
1 stop
$327United Airlines
Fri, Jun 12 - Fri, Jun 19
Air Canada Logo
7:00 am - 12:06 pm
YOW
-
STL
6h 06m
1 stop
Air Canada Logo
2:15 pm - 9:15 pm
STL
-
YOW
6h 00m
1 stop
$328Air Canada
Sat, May 23 - Wed, May 27
United Airlines Logo
2:52 pm - 9:23 pm
YOW
-
STL
7h 31m
2 stops
United Airlines Logo
6:00 am - 5:11 pm
STL
-
YOW
10h 11m
2 stops
$382United Airlines
Sat, May 23 - Sun, May 24
Air Canada Logo
2:40 pm - 9:23 pm
YOW
-
STL
7h 43m
2 stops
Air Canada Logo
7:05 am - 1:05 pm
STL
-
YOW
5h 00m
1 stop
$383Air Canada
Fri, Jul 24 - Sat, Aug 8
United Airlines Logo
5:10 am - 12:11 pm
YOW
-
STL
8h 01m
2 stops
United Airlines Logo
9:23 am - 9:35 pm
STL
-
YOW
11h 12m
1 stop
$390United Airlines
Fri, Jun 12 - Fri, Jun 19
United Airlines Logo
5:05 am - 3:46 pm
YOW
-
STL
11h 41m
2 stops
United Airlines Logo
2:15 pm - 9:15 pm
STL
-
YOW
6h 00m
1 stop
$392United Airlines
Tue, Jun 2 - Wed, Jun 3
Delta Logo
6:55 am - 1:10 pm
YOW
-
STL
7h 15m
2 stops
Delta Logo
1:27 pm - 12:20 am
STL
-
YOW
9h 53m
2 stops
$405Delta
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.

How much is a round-trip flight from Ottawa to St. Louis?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Ottawa to St. Louis departing in May.

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 February, where tickets cost $0 (return) on average. On the other hand, the most expensive months are March and August, where the average cost of round-trip tickets is $649 and $641 respectively.

Find deals

Good to know

Low seasonApril
Cheapest flight$187
Best time to beat the crowds with an average 25% drop in price.
Most popular time to fly and prices are also 13% lower 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 $187 for a one-way ticket and $314 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.

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 10982 reviews
7.3Boarding
6.8Entertainment
7.1Comfort
7.8Crew
6.3Food
Airline reviews

Flight itself was not bad at all. However: my checked bag (checked in Calgary) did not make it onto this flight as I found out after I landed at EWR. I still don't have it but it appears that it is on its way to me.

10.0 ExcellentAnonymous, Apr 2026
YYZ - EWR
Read more Air Canada reviews

Flight itself was not bad at all. However: my checked bag (checked in Calgary) did not make it onto this flight as I found out after I landed at EWR. I still don't have it but it appears that it is on its way to me.

The crew was amazing! I was a bit surprised and disappointed that there was not wifi available for personal use. The only thing I would change would be the seat cushions. They are not comfortable at all for long flights.

Flight and attendance were very good we had 2 hour delay that took the shine of it

The seat design in the premium economy section leaves virtually no room under the seat to store a bag or purse. Other than that, it was a great flight. Arrived early.

The flight was delayed, but not for weather. We landed over 3hrs later than planned.

The stag were helpful, kind and liked the passengers. The plane was pristinely clean! Great flight!

My flight was delayed more than once, but Air Canada updated us regularly. Friends on other airlines had much worse experiences.

Terrible…. Reported missing luggage’s with injectable meds that needed refrigeration. Yet, delivery could not be expedited. Luggage’s were delivered 5 days after arrival. The meds were useless as ice pack had melted. So disappointed!!!

It was a very small plane and was ok. No food or entertainment so there should be an option for NA.

My seat was covered in vomit and I will be reaching out to Air Canada

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)