YOW - STL

$184 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 4/28. 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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41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$291
United Airlines
Sat 4/11Tue 4/14
YOW - STL • 1 stop
Cheapest one-way
$184
United Airlines
Tue 4/28
YOW - STL • 1 stop
Top airlines
United Airlines
Cheapest • from $291 (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
Toronto (YYZ)
Cheapest • Avg $548 (round-trip)
Chicago (ORD)
Shortest trip • 5h 24m (one-way)
Insights
Insights
Insights
Insights
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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, Apr 11 - Tue, Apr 14
United Airlines Logo
2:40 pm - 7:22 pm
YOW
-
STL
5h 42m
1 stop
United Airlines Logo
9:10 am - 5:07 pm
STL
-
YOW
6h 57m
1 stop
$291United Airlines
Sat, Apr 11 - Tue, Apr 14
United Airlines Logo
5:25 pm - 9:13 pm
YOW
-
STL
4h 48m
1 stop
United Airlines Logo
6:30 am - 4:38 pm
STL
-
YOW
9h 08m
2 stops
$295United Airlines
Fri, May 22 - Sun, May 24
United Airlines Logo
5:20 pm - 9:16 pm
YOW
-
STL
4h 56m
1 stop
United Airlines Logo
1:13 pm - 11:54 pm
STL
-
YOW
9h 41m
2 stops
$308United Airlines
Wed, Jun 3 - Sat, Jun 6
United Airlines Logo
10:44 am - 3:46 pm
YOW
-
STL
6h 02m
1 stop
United Airlines Logo
6:00 am - 9:35 pm
STL
-
YOW
14h 35m
1 stop
$309United Airlines
Tue, Apr 14 - Fri, Apr 17
United Airlines Logo
10:44 am - 9:13 pm
YOW
-
STL
11h 29m
1 stop
United Airlines Logo
7:45 am - 1:59 pm
STL
-
YOW
5h 14m
1 stop
$341United Airlines
Mon, Apr 27 - Mon, May 4
United Airlines Logo
10:44 am - 9:13 pm
YOW
-
STL
11h 29m
1 stop
United Airlines Logo
7:45 am - 1:59 pm
STL
-
YOW
5h 14m
1 stop
$344United Airlines
Mon, Apr 13 - Mon, Apr 20
United Airlines Logo
10:25 am - 9:13 pm
YOW
-
STL
11h 48m
2 stops
United Airlines Logo
7:45 am - 5:07 pm
STL
-
YOW
8h 22m
1 stop
$349United Airlines
Sun, Apr 12 - Fri, Apr 17
United Airlines Logo
6:25 am - 10:45 am
YOW
-
STL
5h 20m
1 stop
United Airlines Logo
10:00 am - 9:16 pm
STL
-
YOW
10h 16m
2 stops
$357United Airlines
Sun, Apr 12 - Mon, Apr 20
United Airlines Logo
12:00 pm - 9:13 pm
YOW
-
STL
10h 13m
2 stops
United Airlines Logo
7:45 am - 9:16 pm
STL
-
YOW
12h 31m
2 stops
$366United Airlines
Wed, Jun 3 - Sat, Jun 6
United Airlines Logo
5:20 pm - 9:16 pm
YOW
-
STL
4h 56m
1 stop
United Airlines Logo
6:00 am - 3:11 pm
STL
-
YOW
8h 11m
2 stops
$370United Airlines
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.

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

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Ottawa to St. Louis were found on United Airlines ($291) and Air Canada ($423).

Find deals

Good to know

Cheapest flight$184
Most popular time to fly with an average 11% 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 $184 for a one-way ticket and $291 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 10813 reviews
7.1Comfort
7.3Boarding
6.8Entertainment
7.8Crew
6.3Food
Airline reviews

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!!!

2.0 MediocreFola, Feb 2026
YYZ - PHL
Read more Air Canada reviews

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

We were happy with the service and cost of checking a bag

It's kindof ridiculous that your system is even asking me about this since my flight was canceled and I wasn't rescheduled.

3 hr delay at the gate while they were doing maintenance. Next time, do not board passengers while maintenance is being performed

Digital check in is very poor with air canada compaired to other airlines

Baggage delayed we had to catch our cruise without any clothes 😒

Air Canada Rouge is great. Toronto Airport is the usual nightmare

Good but need to be better with the flight times.

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)