What is the cheapest airline that flies from Ottawa to Lambert-St Louis?

United Airlines is the most popular carrier operating from Ottawa to Lambert-St Louis

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 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.

$227 Cheap Flights from Ottawa to St. Louis in 2025

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Find the cheapest flights from Ottawa to St. Louis

Round-trip

One-way

Last minute

Cheap round-trip flights

3:50 pm - 9:40 amYOW-STL

18h 50m1 stop

5:40 pm - 5:06 pmSTL-YOW

22h 26m1 stop

$483

Find Deal

Wed, Aug 13 - Thu, Aug 14

4:25 pm - 1:32 pmYOW-STL

22h 07m2 stops

2:30 pm - 5:20 pmSTL-YOW

25h 50m3 stops

$522

Find Deal

Thu, Aug 21 - Mon, Aug 25

4:25 pm - 1:32 pmYOW-STL

22h 07m2 stops

3:16 pm - 5:06 pmSTL-YOW

24h 50m1 stop

$545

Find Deal

Thu, Aug 21 - Mon, Aug 25

12:35 pm - 1:32 pmYOW-STL

25h 57m3 stops

2:30 pm - 5:20 pmSTL-YOW

25h 50m3 stops

$554

Find Deal

Thu, Aug 21 - Mon, Aug 25

6:33 am - 2:33 pmYOW-STL

9h 00m1 stop

7:04 pm - 2:26 pmSTL-YOW

18h 22m2 stops

$555United Airlines

Find Deal

Tue, Aug 26 - Tue, Sep 2

7:29 pm - 10:46 amYOW-STL

16h 17m2 stops

7:04 pm - 2:26 pmSTL-YOW

18h 22m2 stops

$570United Airlines

Find Deal

Tue, Aug 26 - Tue, Sep 2

2:25 pm - 8:00 pmYOW-STL

6h 35m1 stop

9:15 am - 5:04 pmSTL-YOW

6h 49m1 stop

$611Air Canada

Find Deal

Tue, Aug 26 - Tue, Sep 2

5:09 pm - 10:43 pmYOW-STL

6h 34m1 stop

11:05 am - 9:18 pmSTL-YOW

9h 13m1 stop

$624United Airlines

Find Deal

Mon, Dec 22 - Mon, Jan 5

5:55 am - 1:20 pmYOW-STL

8h 25m2 stops

3:42 pm - 12:22 amSTL-YOW

7h 40m2 stops

$655WestJet

Find Deal

Thu, Aug 21 - Mon, Aug 25

5:55 am - 11:14 pmYOW-STL

18h 19m2 stops

5:11 pm - 12:22 amSTL-YOW

30h 11m2 stops

$752WestJet

Find Deal

Mon, Aug 18 - Sun, Aug 31

United Airlines flights from Ottawa to St. Louis

Our best United Airlines deals on Ottawa to St. Louis flight tickets

United Airlines

Aug 26

YOW6:33 amOttawa

9h 00m

1 stop

STL2:33 pmLambert-St Louis

Sep 2

STL7:04 pmLambert-St Louis

18h 22m

2 stops

YOW2:26 pmOttawa

$555

Find similar

United Airlines

Aug 26

YOW7:29 pmOttawa

16h 17m

2 stops

STL10:46 amLambert-St Louis

Sep 2

STL7:04 pmLambert-St Louis

18h 22m

2 stops

YOW2:26 pmOttawa

$570

Find similar

United Airlines

Dec 22

YOW5:09 pmOttawa

6h 34m

1 stop

STL10:43 pmLambert-St Louis

Jan 5

STL11:05 amLambert-St Louis

9h 13m

1 stop

YOW9:18 pmOttawa

$624

Find similar

WestJet flights from Ottawa to St. Louis

Our best WestJet deals on Ottawa to St. Louis flight tickets

WestJet

Aug 21

YOW5:55 amOttawa

8h 25m

2 stops

STL1:20 pmLambert-St Louis

Aug 25

STL3:42 pmLambert-St Louis

7h 40m

2 stops

YOW12:22 amOttawa

$655

Find similar

WestJet

Aug 18

YOW5:55 amOttawa

18h 19m

2 stops

STL11:14 pmLambert-St Louis

Aug 31

STL5:11 pmLambert-St Louis

30h 11m

2 stops

YOW12:22 amOttawa

$752

Find similar

WestJet

Aug 13

YOW5:55 amOttawa

28h 37m

2 stops

STL9:32 amLambert-St Louis

Aug 14

STL1:26 pmLambert-St Louis

9h 56m

2 stops

YOW12:22 amOttawa

$781

Find similar

Fly from

Fly to

Route

Depart

Return

Price

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Wed 8/13

3:50 pm-9:40 am

1 stop18h 50m

Lambert-St Louis

Thu 8/14

5:40 pm-5:06 pm

1 stop22h 26m

$483

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 8/21

4:25 pm-1:32 pm

2 stops22h 07m

Lambert-St Louis

Mon 8/25

2:30 pm-5:20 pm

3 stops25h 50m

$522

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 8/21

4:25 pm-1:32 pm

2 stops22h 07m

Lambert-St Louis

Mon 8/25

3:16 pm-5:06 pm

1 stop24h 50m

$545

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 8/21

12:35 pm-1:32 pm

3 stops25h 57m

Lambert-St Louis

Mon 8/25

2:30 pm-5:20 pm

3 stops25h 50m

$554

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 8/26

6:33 am-2:33 pm

1 stop9h 00m

Lambert-St Louis

Tue 9/2

7:04 pm-2:26 pm

2 stops18h 22m

$555

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 8/26

7:29 pm-10:46 am

2 stops16h 17m

Lambert-St Louis

Tue 9/2

7:04 pm-2:26 pm

2 stops18h 22m

$570

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 8/26

2:25 pm-8:00 pm

1 stop6h 35m

Lambert-St Louis

Tue 9/2

9:15 am-5:04 pm

1 stop6h 49m

$611

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Mon 12/22

5:09 pm-10:43 pm

1 stop6h 34m

Lambert-St Louis

Mon 1/5

11:05 am-9:18 pm

1 stop9h 13m

$624

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 8/21

5:55 am-1:20 pm

2 stops8h 25m

Lambert-St Louis

Mon 8/25

3:42 pm-12:22 am

2 stops7h 40m

$655

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Mon 8/18

5:55 am-11:14 pm

2 stops18h 19m

Lambert-St Louis

Sun 8/31

5:11 pm-12:22 am

2 stops30h 11m

$752

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 resultsSorted by cheapest first

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

Prices

Airlines

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

In general, September 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 $511. The month of April is another great option to travel to St. Louis, with average flight prices from Ottawa averaging around $586.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Wednesday when prices can be found for as low as $614. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $667. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

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	$227
Fastest flight time	6h 34m
Direct flights	None
Airports in St. Louis	1 airport

The best one-way flight to St. Louis from Ottawa in the past 72 hours is $227. The best round-trip flight deal from Ottawa to St. Louis found on momondo in the last 72 hours is $483.

The fastest flight from Ottawa to St. Louis takes 6h 34m

There are no direct flights from Ottawa to St. Louis. Popular non-direct route for this connection is Ottawa Airport - Lambert-St Louis Airport.

There is 1 airport near St. Louis: Lambert-St Louis (STL)

Search flight deals

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 6h 34m.
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 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.

St. Charles

Chesterfield

Hermann

Fairview Heights

Maryland Heights

Florissant

Fenton

Collinsville

O'Fallon

Alton

St. Peters

Farmington

Wentzville

Festus

Glencoe

Eureka

Edwardsville

Clayton

Shrewsbury

Grafton

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.