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Cheap flights from St. Louis to Ottawa from $183

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Ottawa departing on 7/1. 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
0 bags

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Find the cheapest flights from St. Louis to Ottawa

Cheap round-trip flights

Enter your travel dates to find the best prices.
Air Canada Logo
7:05 am - 1:05 pm
STL
-
YOW
5h 00m
1 stop
Air Canada Logo
2:40 pm - 8:25 pm
YOW
-
STL
6h 45m
1 stop
$421Air Canada
Sat, May 30 - Wed, Jun 3
Air Canada Logo
7:05 am - 1:05 pm
STL
-
YOW
5h 00m
1 stop
Air Canada Logo
2:40 pm - 8:25 pm
YOW
-
STL
6h 45m
1 stop
$449Air Canada
Sat, May 30 - Wed, Jun 3
Air Canada Logo
7:05 am - 1:05 pm
STL
-
YOW
5h 00m
1 stop
Air Canada Logo
2:40 pm - 8:25 pm
YOW
-
STL
6h 45m
1 stop
$483Air Canada
Sat, May 30 - Wed, Jun 3
Air Canada Logo
7:05 am - 1:05 pm
STL
-
YOW
5h 00m
1 stop
Air Canada Logo
2:40 pm - 8:25 pm
YOW
-
STL
6h 45m
1 stop
$484Air Canada
Sat, May 30 - Wed, Jun 3
United Airlines Logo
6:00 am - 1:59 pm
STL
-
YOW
6h 59m
1 stop
United Airlines Logo
6:00 am - 3:46 pm
YOW
-
STL
10h 46m
2 stops
$496United Airlines
Sat, May 30 - Wed, Jun 3
United Airlines Logo
11:25 am - 10:05 pm
STL
-
YOW
9h 40m
2 stops
United Airlines Logo
6:05 am - 3:46 pm
YOW
-
STL
10h 41m
2 stops
$502United Airlines
Tue, Jun 23 - Tue, Jun 30
Air Canada Logo
6:00 am - 5:07 pm
STL
-
YOW
10h 07m
1 stop
Air Canada Logo
9:55 am - 3:46 pm
YOW
-
STL
6h 51m
2 stops
$505Air Canada
Sat, May 30 - Wed, Jun 3
Air Canada Logo
8:55 am - 9:15 pm
STL
-
YOW
11h 20m
1 stop
Air Canada Logo
2:35 pm - 6:42 pm
YOW
-
STL
5h 07m
1 stop
$508Air Canada
Fri, Aug 7 - Wed, Aug 12
Air Canada Logo
1:13 pm - 9:15 pm
STL
-
YOW
7h 02m
2 stops
Air Canada Logo
6:25 am - 12:11 pm
YOW
-
STL
6h 46m
1 stop
$513Air Canada
Fri, Jul 31 - Sun, Aug 2
United Airlines Logo
6:00 am - 3:11 pm
STL
-
YOW
8h 11m
2 stops
United Airlines Logo
2:00 pm - 9:30 pm
YOW
-
STL
8h 30m
2 stops
$526United Airlines
Sat, May 30 - Wed, Jun 3

Air Canada flights from St. Louis to Ottawa

Our best Air Canada deals on St. Louis to Ottawa flight tickets
Air Canada
May 30
STL7:05 amLambert-St Louis
5h 00m
1 stop
YOW1:05 pmOttawa
Jun 3
YOW2:40 pmOttawa
6h 45m
1 stop
STL8:25 pmLambert-St Louis
$421
Air Canada
May 30
STL7:05 amLambert-St Louis
5h 00m
1 stop
YOW1:05 pmOttawa
Jun 3
YOW2:40 pmOttawa
6h 45m
1 stop
STL8:25 pmLambert-St Louis
$449
Air Canada
May 30
STL7:05 amLambert-St Louis
5h 00m
1 stop
YOW1:05 pmOttawa
Jun 3
YOW2:40 pmOttawa
6h 45m
1 stop
STL8:25 pmLambert-St Louis
$483

United Airlines flights from St. Louis to Ottawa

Our best United Airlines deals on St. Louis to Ottawa flight tickets
United Airlines
May 30
STL6:00 amLambert-St Louis
6h 59m
1 stop
YOW1:59 pmOttawa
Jun 3
YOW6:00 amOttawa
10h 46m
2 stops
STL3:46 pmLambert-St Louis
$496
United Airlines
Jun 23
STL11:25 amLambert-St Louis
9h 40m
2 stops
YOW10:05 pmOttawa
Jun 30
YOW6:05 amOttawa
10h 41m
2 stops
STL3:46 pmLambert-St Louis
$502
United Airlines
May 30
STL6:00 amLambert-St Louis
8h 11m
2 stops
YOW3:11 pmOttawa
Jun 3
YOW2:00 pmOttawa
8h 30m
2 stops
STL9:30 pmLambert-St Louis
$526

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Ottawa 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 May 11, 2026.
Use the filters below to find and compare flights from St. Louis to Ottawa that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

St. LouisOttawa

STL - YOW

STLYOW

Lambert-St Louis

Sat 5/30

7:05 am-1:05 pm

1 stop5h 00m

Ottawa

Wed 6/3

2:40 pm-8:25 pm

1 stop6h 45m

$421

St. LouisOttawa

STL - YOW

STLYOW

Lambert-St Louis

Sat 5/30

7:05 am-1:05 pm

1 stop5h 00m

Ottawa

Wed 6/3

2:40 pm-8:25 pm

1 stop6h 45m

$449

St. LouisOttawa

STL - YOW

STLYOW

Lambert-St Louis

Sat 5/30

7:05 am-1:05 pm

1 stop5h 00m

Ottawa

Wed 6/3

2:40 pm-8:25 pm

1 stop6h 45m

$483

St. LouisOttawa

STL - YOW

STLYOW

Lambert-St Louis

Sat 5/30

7:05 am-1:05 pm

1 stop5h 00m

Ottawa

Wed 6/3

2:40 pm-8:25 pm

1 stop6h 45m

$484

St. LouisOttawa

STL - YOW

STLYOW

Lambert-St Louis

Sat 5/30

6:00 am-1:59 pm

1 stop6h 59m

Ottawa

Wed 6/3

6:00 am-3:46 pm

2 stops10h 46m

$496

St. LouisOttawa

STL - YOW

STLYOW

Lambert-St Louis

Tue 6/23

11:25 am-10:05 pm

2 stops9h 40m

Ottawa

Tue 6/30

6:05 am-3:46 pm

2 stops10h 41m

$502

St. LouisOttawa

STL - YOW

STLYOW

Lambert-St Louis

Sat 5/30

6:00 am-5:07 pm

1 stop10h 07m

Ottawa

Wed 6/3

9:55 am-3:46 pm

2 stops6h 51m

$505

St. LouisOttawa

STL - YOW

STLYOW

Lambert-St Louis

Fri 8/7

8:55 am-9:15 pm

1 stop11h 20m

Ottawa

Wed 8/12

2:35 pm-6:42 pm

1 stop5h 07m

$508

St. LouisOttawa

STL - YOW

STLYOW

Lambert-St Louis

Fri 7/31

1:13 pm-9:15 pm

2 stops7h 02m

Ottawa

Sun 8/2

6:25 am-12:11 pm

1 stop6h 46m

$513

St. LouisOttawa

STL - YOW

STLYOW

Lambert-St Louis

Sat 5/30

6:00 am-3:11 pm

2 stops8h 11m

Ottawa

Wed 6/3

2:00 pm-9:30 pm

2 stops8h 30m

$526

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 resultsSorted by cheapest first
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See travel insights to Ottawa from

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

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 St. Louis and Ottawa?

What is the cheapest month to fly to Ottawa?

In general, January is the cheapest month to fly from St. Louis to Ottawa. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $0. The month of March is another great option to travel to Ottawa, with average flight prices from St. Louis averaging around $350.

Can stopping save me money on St. Louis to Ottawa flights?

You could potentially save up to 2% on your flight if you consider stops on a St. Louis to Ottawa flight.

When to book flights from St. Louis to Ottawa

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

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

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

Fastest flight time

6h 59m

Direct flights

None
The fastest flight from St. Louis to Ottawa takes 6h 59m
There are no direct flights from St. Louis to Ottawa. There are no popular flight routes from St. Louis to Ottawa.
Search flight deals

Frequently asked questions about flying from St. Louis to Ottawa

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

    There are 877.2 mi between Lambert-St Louis and Ottawa. By plane, this route typically takes 6h 59m.

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

    Prices for flights from Lambert-St Louis Airport to Ottawa Airport are updated daily.

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

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Ottawa Airport.

  • What documentation or ID do you need to fly to Ottawa Airport?

    The required travel and health documents for your Ottawa Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Ottawa Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

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

Best airlines flying from St. Louis to Ottawa

Compare and see reviews for airlines that fly from St. Louis to Ottawa with momondo
Airline
Rating
Free Cancellation
Price
Air CanadaPriceFrom $139Free CancellationRating
7.1
11,017 reviews
Search Air Canada flights
United AirlinesPriceFrom $304Free CancellationRating
7.4
9,699 reviews
Search United Airlines flights

Traveling to a place near Ottawa?

Book flights to Ottawa if you plan to visit one of these locations
Gatineau
Pembroke
Petawawa
Smiths Falls
Brockville
Calabogie
Perth
Prescott
Winchester
Wakefield

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from St. Louis to Ottawa. Millions of users trust and use momondo every year so you are in good hands.

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

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

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

momondo provides multiple filters to help you find the best flight to Ottawa from St. Louis. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Yes momondo offers price alerts on flights to Ottawa from St. Louis. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your Ottawa trip

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