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Cheap flights from Ottawa to St. Louis from $665

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
6:00 am - 10:15 pmYOW  Ottawa-STL Lambert-St Louis
17h 15m1 stop Newark
United Airlines Logo
6:30 am - 9:56 pmSTL  Lambert-St Louis-YOW Ottawa
14h 26m2 stops Chicago O'Hare Intl Newark
$665United Airlines
Tue, Dec 8 - Wed, Dec 9
United Airlines Logo
6:00 am - 10:15 pmYOW  Ottawa-STL Lambert-St Louis
17h 15m1 stop Newark
United Airlines Logo
11:00 am - 9:56 pmSTL  Lambert-St Louis-YOW Ottawa
9h 56m1 stop Newark
$665United Airlines
Tue, Dec 8 - Wed, Dec 9
United Airlines Logo
6:00 am - 10:15 pmYOW  Ottawa-STL Lambert-St Louis
17h 15m1 stop Newark
United Airlines Logo
6:30 am - 9:56 pmSTL  Lambert-St Louis-YOW Ottawa
14h 26m2 stops Chicago O'Hare Intl Newark
$666United Airlines
Tue, Dec 8 - Wed, Dec 9
United Airlines Logo
6:00 am - 10:15 pmYOW  Ottawa-STL Lambert-St Louis
17h 15m1 stop Newark
United Airlines Logo
11:00 am - 9:56 pmSTL  Lambert-St Louis-YOW Ottawa
9h 56m1 stop Newark
$666United Airlines
Tue, Dec 8 - Wed, Dec 9
United Airlines Logo
6:15 am - 6:18 pmYOW  Ottawa-STL Lambert-St Louis
13h 03m1 stop Chicago O'Hare Intl
United Airlines Logo
7:18 am - 9:23 pmSTL  Lambert-St Louis-YOW Ottawa
13h 05m1 stop Chicago O'Hare Intl
$689United Airlines
Sat, Dec 19 - Sat, Dec 26
United Airlines Logo
9:45 am - 7:26 pmYOW  Ottawa-STL Lambert-St Louis
10h 41m2 stops Washington, D.C. Dulles Intl Chicago O'Hare Intl
United Airlines Logo
6:30 am - 3:07 pmSTL  Lambert-St Louis-YOW Ottawa
7h 37m2 stops Chicago O'Hare Intl Washington, D.C. Dulles Intl
$689United Airlines
Tue, Dec 8 - Fri, Dec 11
United Airlines Logo
6:15 am - 12:22 pmYOW  Ottawa-STL Lambert-St Louis
7h 07m1 stop Chicago O'Hare Intl
United Airlines Logo
5:25 am - 3:07 pmSTL  Lambert-St Louis-YOW Ottawa
8h 42m2 stops Chicago O'Hare Intl Washington, D.C. Dulles Intl
$689United Airlines
Tue, Dec 8 - Fri, Dec 11
United Airlines Logo
9:45 am - 5:05 pmYOW  Ottawa-STL Lambert-St Louis
8h 20m2 stops Washington, D.C. Dulles Intl Chicago O'Hare Intl
United Airlines Logo
6:30 am - 3:07 pmSTL  Lambert-St Louis-YOW Ottawa
7h 37m2 stops Chicago O'Hare Intl Washington, D.C. Dulles Intl
$689United Airlines
Tue, Dec 8 - Wed, Dec 9
Air Canada Logo
10:00 am - 3:26 pmYOW  Ottawa-STL Lambert-St Louis
6h 26m1 stop Toronto Pearson Intl
Air Canada Logo
8:30 am - 2:09 pmSTL  Lambert-St Louis-YOW Ottawa
4h 39m1 stop Chicago O'Hare Intl
$832Air Canada
Sat, Nov 21 - Sat, Nov 28
Air Canada Logo
10:00 am - 3:26 pmYOW  Ottawa-STL Lambert-St Louis
6h 26m1 stop Toronto Pearson Intl
Air Canada Logo
7:30 am - 7:52 pmSTL  Lambert-St Louis-YOW Ottawa
11h 22m2 stops Chicago O'Hare Intl Toronto Island
$837Air Canada
Sat, Nov 21 - Sat, Nov 28

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United Airlines flights from Ottawa to St. Louis

Our best United Airlines deals on Ottawa to St. Louis flight tickets
United Airlines
Dec 8
YOW6:00 amOttawa
17h 15m
1 stop
STL10:15 pmLambert-St Louis
Dec 9
STL6:30 amLambert-St Louis
14h 26m
2 stops
YOW9:56 pmOttawa
$665
United Airlines
Dec 8
YOW6:00 amOttawa
17h 15m
1 stop
STL10:15 pmLambert-St Louis
Dec 9
STL6:30 amLambert-St Louis
14h 26m
2 stops
YOW9:56 pmOttawa
$666
United Airlines
Dec 8
YOW9:45 amOttawa
8h 20m
2 stops
STL5:05 pmLambert-St Louis
Dec 9
STL6:30 amLambert-St Louis
7h 37m
2 stops
YOW3:07 pmOttawa
$689

Delta flights from Ottawa to St. Louis

Our best Delta deals on Ottawa to St. Louis flight tickets
Delta
Nov 21
YOW5:30 amOttawa
11h 17m
2 stops
STL3:47 pmLambert-St Louis
Nov 28
STL10:20 amLambert-St Louis
12h 20m
2 stops
YOW11:40 pmOttawa
$791
Delta
Nov 21
YOW5:30 amOttawa
11h 17m
2 stops
STL3:47 pmLambert-St Louis
Nov 28
STL10:20 amLambert-St Louis
12h 20m
2 stops
YOW11:40 pmOttawa
$899
Delta
Nov 21
YOW5:30 amOttawa
11h 17m
2 stops
STL3:47 pmLambert-St Louis
Nov 28
STL10:20 amLambert-St Louis
12h 20m
2 stops
YOW11:40 pmOttawa
$976

momondo Fare Finder

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

Fly from

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Route

Depart

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Price

Cheapest round-trip

OttawaSt. Louis

YOW Ottawa - STL Lambert-St Louis

YOWSTL

Ottawa

Tue 12/8

6:00 am-10:15 pm

1 stop17h 15m

Lambert-St Louis

Wed 12/9

6:30 am-9:56 pm

2 stops14h 26m

$665

OttawaSt. Louis

YOW Ottawa - STL Lambert-St Louis

YOWSTL

Ottawa

Tue 12/8

6:00 am-10:15 pm

1 stop17h 15m

Lambert-St Louis

Wed 12/9

11:00 am-9:56 pm

1 stop9h 56m

$665

OttawaSt. Louis

YOW Ottawa - STL Lambert-St Louis

YOWSTL

Ottawa

Tue 12/8

6:00 am-10:15 pm

1 stop17h 15m

Lambert-St Louis

Wed 12/9

6:30 am-9:56 pm

2 stops14h 26m

$666

OttawaSt. Louis

YOW Ottawa - STL Lambert-St Louis

YOWSTL

Ottawa

Tue 12/8

6:00 am-10:15 pm

1 stop17h 15m

Lambert-St Louis

Wed 12/9

11:00 am-9:56 pm

1 stop9h 56m

$666

OttawaSt. Louis

YOW Ottawa - STL Lambert-St Louis

YOWSTL

Ottawa

Sat 12/19

6:15 am-6:18 pm

1 stop13h 03m

Lambert-St Louis

Sat 12/26

7:18 am-9:23 pm

1 stop13h 05m

$689

OttawaSt. Louis

YOW Ottawa - STL Lambert-St Louis

YOWSTL

Ottawa

Tue 12/8

9:45 am-7:26 pm

2 stops10h 41m

Lambert-St Louis

Fri 12/11

6:30 am-3:07 pm

2 stops7h 37m

$689

OttawaSt. Louis

YOW Ottawa - STL Lambert-St Louis

YOWSTL

Ottawa

Tue 12/8

6:15 am-12:22 pm

1 stop7h 07m

Lambert-St Louis

Fri 12/11

5:25 am-3:07 pm

2 stops8h 42m

$689

OttawaSt. Louis

YOW Ottawa - STL Lambert-St Louis

YOWSTL

Ottawa

Tue 12/8

9:45 am-5:05 pm

2 stops8h 20m

Lambert-St Louis

Wed 12/9

6:30 am-3:07 pm

2 stops7h 37m

$689
Quickest round-trip

OttawaSt. Louis

YOW Ottawa - STL Lambert-St Louis

YOWSTL

Ottawa

Sat 11/21

10:00 am-3:26 pm

1 stop6h 26m

Lambert-St Louis

Sat 11/28

8:30 am-2:09 pm

1 stop4h 39m

$832

OttawaSt. Louis

YOW Ottawa - STL Lambert-St Louis

YOWSTL

Ottawa

Sat 11/21

10:00 am-3:26 pm

1 stop6h 26m

Lambert-St Louis

Sat 11/28

7:30 am-7:52 pm

2 stops11h 22m

$837

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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, May 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 $294. The month of September is another great option to travel to St. Louis, with average flight prices from Ottawa averaging around $352.

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

$665

Fastest flight time

7h 38m

Direct flights

None
The best flight deal from Ottawa to St. Louis found on momondo in the last 72 hours is $665
The fastest flight from Ottawa to St. Louis takes 7h 38m
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 7h 38m.

  • 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
11,861 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
Farmington
Florissant
Festus
Hermann
Clayton
Fenton
Edwardsville
O'Fallon
Eureka
Wentzville
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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