Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Ottawa to St. Louis from $222

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ottawa to St. Louis departing on 7/16. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Ottawa to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
11:00 am - 3:38 pm
YOW
-
STL
5h 38m
1 stop
United Airlines Logo
9:23 am - 5:14 pm
STL
-
YOW
6h 51m
1 stop
$374United Airlines
Tue, Oct 27 - Wed, Oct 28
Air Canada Logo
10:10 am - 3:30 pm
YOW
-
STL
6h 20m
1 stop
Air Canada Logo
4:15 pm - 11:48 pm
STL
-
YOW
6h 33m
1 stop
$381Air Canada
Tue, Oct 27 - Wed, Oct 28
Air Canada Logo
10:10 am - 3:30 pm
YOW
-
STL
6h 20m
1 stop
Air Canada Logo
4:15 pm - 11:48 pm
STL
-
YOW
6h 33m
1 stop
$382Air Canada
Tue, Oct 27 - Wed, Oct 28
United Airlines Logo
3:10 pm - 11:29 pm
YOW
-
STL
9h 19m
2 stops
United Airlines Logo
8:00 am - 1:59 pm
STL
-
YOW
4h 59m
1 stop
$389United Airlines
Fri, Jul 3 - Tue, Jul 7
United Airlines Logo
5:50 pm - 11:44 pm
YOW
-
STL
6h 54m
1 stop
United Airlines Logo
6:00 am - 9:35 pm
STL
-
YOW
14h 35m
1 stop
$390United Airlines
Fri, Jul 31 - Fri, Aug 7
United Airlines Logo
5:20 pm - 9:26 pm
YOW
-
STL
5h 06m
1 stop
United Airlines Logo
6:00 am - 9:35 pm
STL
-
YOW
14h 35m
1 stop
$391United Airlines
Fri, Jul 3 - Tue, Jul 7
United Airlines Logo
3:10 pm - 11:44 pm
YOW
-
STL
9h 34m
1 stop
United Airlines Logo
11:25 am - 5:07 pm
STL
-
YOW
4h 42m
1 stop
$393United Airlines
Fri, Jul 3 - Tue, Jul 7
United Airlines Logo
10:00 am - 9:26 pm
YOW
-
STL
12h 26m
2 stops
United Airlines Logo
8:00 am - 1:59 pm
STL
-
YOW
4h 59m
1 stop
$401United Airlines
Fri, Jul 3 - Tue, Jul 7
Air Canada Logo
9:55 am - 3:41 pm
YOW
-
STL
6h 46m
2 stops
Air Canada Logo
9:40 am - 7:51 pm
STL
-
YOW
9h 11m
2 stops
$430Air Canada
Tue, Oct 27 - Wed, Oct 28
Air Canada Logo
9:55 am - 3:41 pm
YOW
-
STL
6h 46m
2 stops
Air Canada Logo
9:40 am - 7:51 pm
STL
-
YOW
9h 11m
2 stops
$431Air Canada
Tue, Oct 27 - Wed, Oct 28

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

United Airlines flights from Ottawa to St. Louis

Our best United Airlines deals on Ottawa to St. Louis flight tickets
United Airlines
Oct 27
YOW11:00 amOttawa
5h 38m
1 stop
STL3:38 pmLambert-St Louis
Oct 28
STL9:23 amLambert-St Louis
6h 51m
1 stop
YOW5:14 pmOttawa
$374
United Airlines
Jul 3
YOW3:10 pmOttawa
9h 19m
2 stops
STL11:29 pmLambert-St Louis
Jul 7
STL8:00 amLambert-St Louis
4h 59m
1 stop
YOW1:59 pmOttawa
$389
United Airlines
Jul 31
YOW5:50 pmOttawa
6h 54m
1 stop
STL11:44 pmLambert-St Louis
Aug 7
STL6:00 amLambert-St Louis
14h 35m
1 stop
YOW9:35 pmOttawa
$390

American Airlines flights from Ottawa to St. Louis

Our best American Airlines deals on Ottawa to St. Louis flight tickets
American Airlines
Jul 31
YOW7:00 amOttawa
11h 02m
3 stops
STL5:02 pmLambert-St Louis
Aug 7
STL6:00 amLambert-St Louis
7h 55m
2 stops
YOW2:55 pmOttawa
$861
American Airlines
Jul 3
YOW8:40 amOttawa
10h 06m
2 stops
STL5:46 pmLambert-St Louis
Jul 7
STL5:10 amLambert-St Louis
13h 55m
3 stops
YOW8:05 pmOttawa
$1,040
American Airlines
Jul 3
YOW8:40 amOttawa
16h 36m
2 stops
STL12:16 amLambert-St Louis
Jul 7
STL7:32 amLambert-St Louis
13h 03m
3 stops
YOW9:35 pmOttawa
$1,133

momondo Fare Finder

 
Customize your flight search to find flights from Ottawa to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated June 20, 2026.
Use the filters below to find and compare flights from Ottawa to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 10/27

11:00 am-3:38 pm

1 stop5h 38m

Lambert-St Louis

Wed 10/28

9:23 am-5:14 pm

1 stop6h 51m

$374

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 10/27

10:10 am-3:30 pm

1 stop6h 20m

Lambert-St Louis

Wed 10/28

4:15 pm-11:48 pm

1 stop6h 33m

$381

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 10/27

10:10 am-3:30 pm

1 stop6h 20m

Lambert-St Louis

Wed 10/28

4:15 pm-11:48 pm

1 stop6h 33m

$382

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 7/3

3:10 pm-11:29 pm

2 stops9h 19m

Lambert-St Louis

Tue 7/7

8:00 am-1:59 pm

1 stop4h 59m

$389

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 7/31

5:50 pm-11:44 pm

1 stop6h 54m

Lambert-St Louis

Fri 8/7

6:00 am-9:35 pm

1 stop14h 35m

$390

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 7/3

5:20 pm-9:26 pm

1 stop5h 06m

Lambert-St Louis

Tue 7/7

6:00 am-9:35 pm

1 stop14h 35m

$391

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 7/3

3:10 pm-11:44 pm

1 stop9h 34m

Lambert-St Louis

Tue 7/7

11:25 am-5:07 pm

1 stop4h 42m

$393

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 7/3

10:00 am-9:26 pm

2 stops12h 26m

Lambert-St Louis

Tue 7/7

8:00 am-1:59 pm

1 stop4h 59m

$401

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 10/27

9:55 am-3:41 pm

2 stops6h 46m

Lambert-St Louis

Wed 10/28

9:40 am-7:51 pm

2 stops9h 11m

$430

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 10/27

9:55 am-3:41 pm

2 stops6h 46m

Lambert-St Louis

Wed 10/28

9:40 am-7:51 pm

2 stops9h 11m

$431

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 resultsSorted by cheapest first
1
2

See travel insights to St. Louis from

How to get the cheapest flight ticket from Ottawa to St. Louis

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between Ottawa and St. Louis?

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

In general, February is the cheapest month to fly from Ottawa to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $0. The month of May is another great option to travel to St. Louis, with average flight prices from Ottawa averaging around $294.

When to book flights from Ottawa to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from Ottawa to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ottawa to St. Louis (YOW to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ottawa to St. Louis

Fastest flight time

4h 39m

Direct flights

None
The fastest flight from Ottawa to St. Louis takes 4h 39m
There are no direct flights from Ottawa to St. Louis. There are no popular flight routes from Ottawa to St. Louis.
Search flight deals

Frequently asked questions about flying from Ottawa to St. Louis

  • How far is Ottawa to Lambert-St Louis by plane?

    The straight-line distance from Ottawa to Lambert-St Louis is 877.2 mi. By plane, this route typically takes 4h 39m.

  • When did momondo last update prices for flights from Ottawa Airport to Lambert-St Louis Airport?

    Prices for flights from Ottawa Airport to Lambert-St Louis Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Ottawa Airport to Lambert-St Louis Airport?

  • How old do you have to be to fly from Ottawa Airport to Lambert-St Louis Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ottawa Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The travel and health documents you'll need for your trip to Lambert-St Louis Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Lambert-St Louis Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Ottawa to St. Louis?

Best airlines flying from Ottawa to St. Louis

Compare and see reviews for airlines that fly from Ottawa to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
Air CanadaPriceFrom $285Free CancellationRating
7.1
11,231 reviews
Search Air Canada flights

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Fairview Heights
Hermann
Maryland Heights
Florissant
O'Fallon
St. Peters
Collinsville
Alton
Wentzville
Clayton
Fenton
Farmington
Festus
Eureka
Litchfield
Edwardsville
Grafton
Shrewsbury

Why use momondo?

Why should I use momondo to find a flight deal from Ottawa to St. Louis?

Finding the right flight to St. Louis from Ottawa is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to St. Louis quick and easy, saving you time and money.

Can I find flights from Ottawa to St. Louis with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to St. Louis from Ottawa with this policy.

How can momondo help me find flights from Ottawa to St. Louis?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Ottawa to St. Louis.

I’m not ready to book a flight from Ottawa to St. Louis right now. Can momondo alert me if prices change?

If you are simply researching potential flights to St. Louis, momondo offers a useful price alert feature which will track prices for flights to St. Louis from Ottawa and alert you when they change.

An easier way to manage your St. Louis trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Mon 7/20
Mon 7/27
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States