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Cheap flights from Ottawa to St. Louis from $316

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.
Multiple Airlines Logo
4:00 pm - 6:57 pmYOW  Ottawa-STL Lambert-St Louis
27h 57m3 stops Toronto Pearson Intl Las Vegas Harry Reid Intl Denver Intl
Multiple Airlines Logo
7:59 pm - 1:01 amSTL  Lambert-St Louis-YOW Ottawa
28h 02m3 stops Denver Intl Phoenix Sky Harbor Intl Calgary
$561Multiple Airlines
Fri, Oct 23 - Sat, Oct 31
Air Canada Logo
10:05 am - 3:23 pmYOW  Ottawa-STL Lambert-St Louis
6h 18m1 stop Toronto Pearson Intl
Air Canada Logo
4:05 pm - 11:55 pmSTL  Lambert-St Louis-YOW Ottawa
6h 50m1 stop Toronto Pearson Intl
$580Air Canada
Sun, Nov 1 - Sun, Nov 8
United Airlines Logo
3:10 pm - 9:09 pmYOW  Ottawa-STL Lambert-St Louis
6h 59m1 stop Newark
United Airlines Logo
9:04 am - 9:35 pmSTL  Lambert-St Louis-YOW Ottawa
11h 31m1 stop Chicago O'Hare Intl
$590United Airlines
Thu, Oct 15 - Sun, Oct 18
United Airlines Logo
9:45 am - 4:59 pmYOW  Ottawa-STL Lambert-St Louis
8h 14m2 stops Washington, D.C. Dulles Intl Chicago O'Hare Intl
United Airlines Logo
11:15 am - 9:56 pmSTL  Lambert-St Louis-YOW Ottawa
9h 41m2 stops Chicago O'Hare Intl Newark
$590United Airlines
Fri, Oct 30 - Sat, Oct 31
United Airlines Logo
6:01 pm - 8:48 amYOW  Ottawa-STL Lambert-St Louis
15h 47m1 stop Newark
United Airlines Logo
6:09 am - 1:11 pmSTL  Lambert-St Louis-YOW Ottawa
6h 02m1 stop Newark
$590United Airlines
Fri, Oct 23 - Sat, Oct 31
United Airlines Logo
6:00 am - 2:17 pmYOW  Ottawa-STL Lambert-St Louis
9h 17m2 stops Washington, D.C. Dulles Intl Chicago O'Hare Intl
United Airlines Logo
6:00 am - 5:16 pmSTL  Lambert-St Louis-YOW Ottawa
10h 16m1 stop Chicago O'Hare Intl
$590United Airlines
Thu, Oct 15 - Sun, Oct 18
United Airlines Logo
5:20 pm - 9:21 pmYOW  Ottawa-STL Lambert-St Louis
5h 01m1 stop Chicago O'Hare Intl
United Airlines Logo
7:30 am - 4:38 pmSTL  Lambert-St Louis-YOW Ottawa
8h 08m1 stop Newark
$590United Airlines
Thu, Oct 15 - Mon, Oct 19
United Airlines Logo
6:01 pm - 8:48 amYOW  Ottawa-STL Lambert-St Louis
15h 47m1 stop Newark
United Airlines Logo
5:00 am - 2:09 pmSTL  Lambert-St Louis-YOW Ottawa
8h 09m1 stop Chicago O'Hare Intl
$590United Airlines
Fri, Oct 23 - Sun, Nov 1
United Airlines Logo
6:00 am - 9:21 pmYOW  Ottawa-STL Lambert-St Louis
16h 21m3 stops Washington, D.C. Dulles Intl Indianapolis Chicago O'Hare Intl
United Airlines Logo
3:11 pm - 9:35 pmSTL  Lambert-St Louis-YOW Ottawa
5h 24m1 stop Chicago O'Hare Intl
$590United Airlines
Thu, Oct 15 - Sun, Oct 18
Air Canada Logo
2:50 pm - 6:41 pmYOW  Ottawa-STL Lambert-St Louis
4h 51m1 stop Montreal Pierre Elliott Trudeau Intl
Air Canada Logo
2:40 pm - 9:20 pmSTL  Lambert-St Louis-YOW Ottawa
5h 40m1 stop Toronto Pearson Intl
$597Air Canada
Thu, Oct 15 - Mon, Oct 19

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Air Canada flights from Ottawa to St. Louis

Our best Air Canada deals on Ottawa to St. Louis flight tickets
Air Canada
Nov 1
YOW10:05 amOttawa
6h 18m
1 stop
STL3:23 pmLambert-St Louis
Nov 8
STL4:05 pmLambert-St Louis
6h 50m
1 stop
YOW11:55 pmOttawa
$580
Air Canada
Oct 15
YOW2:50 pmOttawa
4h 51m
1 stop
STL6:41 pmLambert-St Louis
Oct 19
STL2:40 pmLambert-St Louis
5h 40m
1 stop
YOW9:20 pmOttawa
$597
Air Canada
Oct 16
YOW2:50 pmOttawa
4h 51m
1 stop
STL6:41 pmLambert-St Louis
Oct 26
STL4:05 pmLambert-St Louis
6h 50m
1 stop
YOW11:55 pmOttawa
$604

American Airlines flights from Ottawa to St. Louis

Our best American Airlines deals on Ottawa to St. Louis flight tickets
American Airlines
Oct 16
YOW7:00 amOttawa
14h 57m
2 stops
STL8:57 pmLambert-St Louis
Oct 26
STL11:31 amLambert-St Louis
29h 27m
2 stops
YOW5:58 pmOttawa
$631
American Airlines
Oct 16
YOW7:00 amOttawa
14h 57m
2 stops
STL8:57 pmLambert-St Louis
Oct 26
STL11:31 amLambert-St Louis
29h 27m
2 stops
YOW5:58 pmOttawa
$644
American Airlines
Oct 16
YOW7:00 amOttawa
14h 57m
2 stops
STL8:57 pmLambert-St Louis
Oct 26
STL6:10 pmLambert-St Louis
22h 48m
3 stops
YOW5:58 pmOttawa
$860

momondo Fare Finder

 
Use the filters below to find and compare flights from Ottawa to St. Louis that are best for you.

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Route

Depart

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Price

Cheapest round-trip

OttawaSt. Louis

YOW Ottawa - STL Lambert-St Louis

YOWSTL

Ottawa

Fri 10/23

4:00 pm-6:57 pm

3 stops27h 57m

Lambert-St Louis

Sat 10/31

7:59 pm-1:01 am

3 stops28h 02m

$561

OttawaSt. Louis

YOW Ottawa - STL Lambert-St Louis

YOWSTL

Ottawa

Sun 11/1

10:05 am-3:23 pm

1 stop6h 18m

Lambert-St Louis

Sun 11/8

4:05 pm-11:55 pm

1 stop6h 50m

$580

OttawaSt. Louis

YOW Ottawa - STL Lambert-St Louis

YOWSTL

Ottawa

Thu 10/15

3:10 pm-9:09 pm

1 stop6h 59m

Lambert-St Louis

Sun 10/18

9:04 am-9:35 pm

1 stop11h 31m

$590

OttawaSt. Louis

YOW Ottawa - STL Lambert-St Louis

YOWSTL

Ottawa

Fri 10/30

9:45 am-4:59 pm

2 stops8h 14m

Lambert-St Louis

Sat 10/31

11:15 am-9:56 pm

2 stops9h 41m

$590

OttawaSt. Louis

YOW Ottawa - STL Lambert-St Louis

YOWSTL

Ottawa

Fri 10/23

6:01 pm-8:48 am

1 stop15h 47m

Lambert-St Louis

Sat 10/31

6:09 am-1:11 pm

1 stop6h 02m

$590

OttawaSt. Louis

YOW Ottawa - STL Lambert-St Louis

YOWSTL

Ottawa

Thu 10/15

6:00 am-2:17 pm

2 stops9h 17m

Lambert-St Louis

Sun 10/18

6:00 am-5:16 pm

1 stop10h 16m

$590

OttawaSt. Louis

YOW Ottawa - STL Lambert-St Louis

YOWSTL

Ottawa

Thu 10/15

5:20 pm-9:21 pm

1 stop5h 01m

Lambert-St Louis

Mon 10/19

7:30 am-4:38 pm

1 stop8h 08m

$590

OttawaSt. Louis

YOW Ottawa - STL Lambert-St Louis

YOWSTL

Ottawa

Fri 10/23

6:01 pm-8:48 am

1 stop15h 47m

Lambert-St Louis

Sun 11/1

5:00 am-2:09 pm

1 stop8h 09m

$590

OttawaSt. Louis

YOW Ottawa - STL Lambert-St Louis

YOWSTL

Ottawa

Thu 10/15

6:00 am-9:21 pm

3 stops16h 21m

Lambert-St Louis

Sun 10/18

3:11 pm-9:35 pm

1 stop5h 24m

$590
Quickest round-trip

OttawaSt. Louis

YOW Ottawa - STL Lambert-St Louis

YOWSTL

Ottawa

Thu 10/15

2:50 pm-6:41 pm

1 stop4h 51m

Lambert-St Louis

Mon 10/19

2:40 pm-9:20 pm

1 stop5h 40m

$597

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 resultsSorted by cheapest first
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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 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

Best Price Found

$316

Fastest flight time

5h 20m

Direct flights

None
The best one-way flight to St. Louis from Ottawa in the past 72 hours is $316. The best round-trip flight deal from Ottawa to St. Louis found on momondo in the last 72 hours is $561.
The fastest flight from Ottawa to St. Louis takes 5h 20m
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 5h 20m.

  • 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
11,661 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
Maryland Heights
St. Peters
Alton
Collinsville
Florissant
Hermann
Clayton
O'Fallon
Farmington
Festus
Fenton
Edwardsville
Wentzville
Eureka
Litchfield
Grafton
Waterloo

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.

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