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?

As of December 2025, there is 1 operator available to choose from 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.

$282 Cheap Flights from Ottawa to St. Louis in 2025/26

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Find the cheapest flights from Ottawa to St. Louis

Round-trip

One-way

Cheap round-trip flights

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4:15 pm - 6:51 am

YOW

STL

39h 36m2 stops

5:42 pm - 5:13 pm

STL

YOW

22h 31m1 stop

$282Multiple Airlines

Mon, Feb 2 - Mon, Feb 9

5:55 pm - 11:59 pm

YOW

STL

7h 04m1 stop

3:11 pm - 9:18 pm

STL

YOW

5h 07m1 stop

$309United Airlines

Mon, Feb 2 - Mon, Feb 9

5:55 pm - 11:59 pm

YOW

STL

7h 04m1 stop

9:57 am - 9:56 pm

STL

YOW

10h 59m2 stops

$312United Airlines

Mon, Jan 19 - Sat, Jan 24

7:00 am - 6:51 am

YOW

STL

24h 51m2 stops

5:42 pm - 11:58 pm

STL

YOW

29h 16m1 stop

$333Multiple Airlines

Sun, Feb 1 - Sun, Feb 8

4:20 pm - 9:21 am

YOW

STL

18h 01m1 stop

5:42 pm - 11:58 pm

STL

YOW

29h 16m1 stop

$356Multiple Airlines

Sun, Feb 1 - Sun, Feb 8

6:00 am - 2:30 pm

YOW

STL

9h 30m2 stops

6:40 pm - 2:30 pm

STL

YOW

18h 50m2 stops

$365United Airlines

Thu, Jan 8 - Mon, Jan 12

6:00 am - 2:30 pm

YOW

STL

9h 30m2 stops

8:05 am - 11:54 pm

STL

YOW

14h 49m2 stops

$372United Airlines

Sun, Feb 1 - Sun, Feb 8

5:40 am - 4:42 pm

YOW

STL

12h 02m2 stops

3:58 pm - 12:39 am

STL

YOW

7h 41m2 stops

$378Delta

Thu, Mar 26 - Mon, Mar 30

5:40 am - 4:37 pm

YOW

STL

11h 57m2 stops

10:19 am - 12:42 am

STL

YOW

13h 23m2 stops

$555Delta

Mon, Jan 19 - Sat, Jan 24

12:00 pm - 10:58 pm

YOW

STL

11h 58m2 stops

9:57 am - 9:18 pm

STL

YOW

10h 21m2 stops

$576United Airlines

Mon, Jan 19 - Sat, Jan 24

United Airlines flights from Ottawa to St. Louis

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

United Airlines

Feb 2

YOW5:55 pmOttawa

7h 04m

1 stop

STL11:59 pmLambert-St Louis

Feb 9

STL3:11 pmLambert-St Louis

5h 07m

1 stop

YOW9:18 pmOttawa

$309

Find similar

United Airlines

Jan 19

YOW5:55 pmOttawa

7h 04m

1 stop

STL11:59 pmLambert-St Louis

Jan 24

STL9:57 amLambert-St Louis

10h 59m

2 stops

YOW9:56 pmOttawa

$312

Find similar

United Airlines

Jan 8

YOW6:00 amOttawa

9h 30m

2 stops

STL2:30 pmLambert-St Louis

Jan 12

STL6:40 pmLambert-St Louis

18h 50m

2 stops

YOW2:30 pmOttawa

$365

Find similar

Delta flights from Ottawa to St. Louis

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

Delta

Mar 26

YOW5:40 amOttawa

12h 02m

2 stops

STL4:42 pmLambert-St Louis

Mar 30

STL3:58 pmLambert-St Louis

7h 41m

2 stops

YOW12:39 amOttawa

$378

Find similar

Delta

Jan 19

YOW5:40 amOttawa

11h 57m

2 stops

STL4:37 pmLambert-St Louis

Jan 24

STL10:19 amLambert-St Louis

13h 23m

2 stops

YOW12:42 amOttawa

$555

Find similar

Delta

Jan 19

YOW5:40 amOttawa

11h 57m

2 stops

STL4:37 pmLambert-St Louis

Jan 24

STL10:19 amLambert-St Louis

13h 23m

2 stops

YOW12:42 amOttawa

$585

Find similar

Fly from

Fly to

Route

Depart

Return

Price

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Mon 2/2

4:15 pm-6:51 am

2 stops39h 36m

Lambert-St Louis

Mon 2/9

5:42 pm-5:13 pm

1 stop22h 31m

$282

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Mon 2/2

5:55 pm-11:59 pm

1 stop7h 04m

Lambert-St Louis

Mon 2/9

3:11 pm-9:18 pm

1 stop5h 07m

$309

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Mon 1/19

5:55 pm-11:59 pm

1 stop7h 04m

Lambert-St Louis

Sat 1/24

9:57 am-9:56 pm

2 stops10h 59m

$312

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Sun 2/1

7:00 am-6:51 am

2 stops24h 51m

Lambert-St Louis

Sun 2/8

5:42 pm-11:58 pm

1 stop29h 16m

$333

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Sun 2/1

4:20 pm-9:21 am

1 stop18h 01m

Lambert-St Louis

Sun 2/8

5:42 pm-11:58 pm

1 stop29h 16m

$356

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 1/8

6:00 am-2:30 pm

2 stops9h 30m

Lambert-St Louis

Mon 1/12

6:40 pm-2:30 pm

2 stops18h 50m

$365

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Sun 2/1

6:00 am-2:30 pm

2 stops9h 30m

Lambert-St Louis

Sun 2/8

8:05 am-11:54 pm

2 stops14h 49m

$372

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 3/26

5:40 am-4:42 pm

2 stops12h 02m

Lambert-St Louis

Mon 3/30

3:58 pm-12:39 am

2 stops7h 41m

$378

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Mon 1/19

5:40 am-4:37 pm

2 stops11h 57m

Lambert-St Louis

Sat 1/24

10:19 am-12:42 am

2 stops13h 23m

$555

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Mon 1/19

12:00 pm-10:58 pm

2 stops11h 58m

Lambert-St Louis

Sat 1/24

9:57 am-9:18 pm

2 stops10h 21m

$576

Flights are sorted by cheapest round-trip flights first.

Sorted 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

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

In general, November 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 $496. The month of September is another great option to travel to St. Louis, with average flight prices from Ottawa averaging around $514.

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

Fastest flight time	6h 47m
Direct flights	None

The fastest flight from Ottawa to St. Louis takes 6h 47m

There are no direct flights from Ottawa to St. Louis. There are no popular flight routes from Ottawa to St. Louis.

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 47m.
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?
As of December 2025, there is 1 operator available to choose from 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?
Based on momondo bookings for flights between Ottawa and St. Louis, the leading airline is Air Canada, making up 100% of the total bookings.

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 Canada	PriceFrom $350	Free Cancellation	Rating 7.1 10,549 reviews		Search Air Canada flights

St. Charles

Chesterfield

Hermann

Fairview Heights

Maryland Heights

O'Fallon

Florissant

Fenton

Wentzville

St. Peters

Collinsville

Alton

Clayton

Festus

Glencoe

Farmington

Eureka

Edwardsville

Litchfield

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.