How long is the flight from St. Louis to Ottawa?

A quick flight from St. Louis to Ottawa can take about 14h 47m. United Airlines provides one of the quickest options available for as low as $749. St. Louis and Ottawa are separated by a distance of 878 mi.

What are the cheapest airlines flying from St. Louis to Ottawa round-trip?

Currently priced at $139, Air Canada will fly you from St. Louis to Ottawa and back. In addition to Air Canada, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on United Airlines for as low as $203. Air Canada is 77% cheaper than the average price of flights available within the next 90 days to this destination.

In terms of precipitation, rainfall in Ottawa ranges from 2.0 - 3.7 inches per month. June is typically the wettest month, when rainfall can reach 3.7 in. February is typically the driest time to visit Ottawa when rainfall is around 2.0 in.

If weather is an important factor for your trip to Ottawa, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 14.0 F).

What is the cheapest time of day to fly from STL to YOW?

When flying from St. Louis to Ottawa, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Most accurate provider : When it comes to deals on St. Louis-Ottawa flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Ottawa flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Ottawa flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on St. Louis-Ottawa flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Ottawa flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Can I find deals for flights from St. Louis to Ottawa that include hotel bookings?

Yes. In addition to deals on St. Louis to Ottawa flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from St. Louis to Ottawa?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Ottawa.

Can I find deals for business class flights from St. Louis to Ottawa?

Yes. Cheapflights offers flight deals from St. Louis to Ottawa by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$301+ Cheap Flights from St. Louis to Ottawa

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Cheap flight deals from St. Louis to Ottawa

Cheapest

Best

Last-minute

One-way

Cheapest flights from St. Louis to Ottawa
Explore the most affordable flight options available from St. Louis to Ottawa. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 11, 2026.

Wed 12/912:02 pm -

2 stops35h 07m

Wed 12/168:00 am -

1 stop17h 12m

Deal found 11/9

$548

Thu 12/245:58 pm -

1 stop19h 32m

Thu 12/315:40 pm -

2 stops32h 01m

Deal found 11/9

$615

Wed 12/91:00 pm -

2 stops9h 40m

Wed 12/165:30 am -

2 stops9h 00m

Deal found 11/9

$644

Sat 12/56:10 am -

1 stop14h 46m

Wed 12/96:00 am -

1 stop17h 15m

Deal found 11/6

$749

Best flights from St. Louis to Ottawa
Discover carefully curated flight deals from St. Louis to Ottawa that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 11, 2026.

Thu 12/245:58 pm -

1 stop19h 32m

Thu 12/315:40 pm -

2 stops32h 01m

Deal found 11/9

$615

Wed 12/96:09 am -

1 stop14h 47m

Wed 12/166:00 am -

1 stop17h 22m

Deal found 11/9

$749

Wed 12/912:02 pm -

3 stops22h 31m

Wed 12/167:00 am -

3 stops34h 50m

Deal found 11/9

$693

Sat 12/56:10 am -

1 stop14h 46m

Wed 12/96:00 am -

1 stop17h 15m

Deal found 11/6

$749

Sat 12/56:30 am -

2 stops14h 26m

Sat 12/126:00 am -

1 stop11h 24m

Deal found 11/7

$759

Wed 1/203:03 pm -

1 stop5h 20m

Wed 1/279:45 am -

1 stop10h 42m

Deal found 11/10

$795

Last-minute flights from St. Louis to Ottawa
Discover last-minute flight deals from St. Louis to Ottawa. Data last updated November 11, 2026 and is based on user searches.

Sat 12/56:10 am -

1 stop14h 46m

Wed 12/96:00 am -

1 stop17h 15m

Deal found 11/6

$749

Wed 12/912:02 pm -

2 stops35h 07m

Wed 12/168:00 am -

1 stop17h 12m

Deal found 11/9

$548

Wed 12/91:00 pm -

2 stops9h 40m

Wed 12/165:30 am -

2 stops9h 00m

Deal found 11/9

$644

Thu 12/245:58 pm -

1 stop19h 32m

Thu 12/315:40 pm -

2 stops32h 01m

Deal found 11/9

$615

One-way flights from St. Louis to Ottawa
Search for one-way flight options from St. Louis to Ottawa. Find affordable one-way fares based on user searches. Data last updated November 11, 2026.

Wed 11/256:35 pm -

3 stops45h 49m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 11/10

$301

Fri 12/256:20 pm -

2 stops21h 55m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 11/10

$307

Tue 11/245:15 pm -

3 stops29h 25m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 11/10

$326

Tue 11/241:00 pm -

1 stop5h 27m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 11/10

$354

Wed 11/255:00 am -

2 stops13h 27m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 11/10

$374

Mon 11/236:35 pm -

3 stops28h 05m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 11/10

$381

Mon 11/167:59 pm -

3 stops50h 20m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 11/10

$405

Mon 11/165:00 am -

1 stop15h 16m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 11/9

$423

Find flight deals from St. Louis to Ottawa

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$548 (Kiwi.com)
One-way from	$301 (Kiwi.com)
Popular in	December
Cheapest in	June
Average price	$871

Provider with most accurate pricing for Lambert-St Louis-Ottawa flight deals.

Search Deals

Provider most trusted by Cheapflights users for Lambert-St Louis-Ottawa flights.

Search Deals

From Lambert-St Louis to Ottawa

Search Deals

One-way flight from Lambert-St Louis to Ottawa

Search Deals

Highest demand for flights based on searches. 33% potential increase in price ($306 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 6% potential price decrease ($37 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in November 2026

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisOttawa

STL Lambert-St Louis - YOW Ottawa

STLYOW

Lambert-St Louis

Tue 11/24

5:15 pm-11:40 pm

3 stops29h 25m

Ottawa

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$326

Quickest round-trip

St. LouisOttawa

STL Lambert-St Louis - YOW Ottawa

STLYOW

Lambert-St Louis

Tue 11/24

1:00 pm-7:27 pm

1 stop5h 27m

Ottawa

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$354

St. LouisOttawa

STL Lambert-St Louis - YOW Ottawa

STLYOW

Lambert-St Louis

Wed 11/25

5:00 am-7:27 pm

2 stops13h 27m

Ottawa

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$374

St. LouisOttawa

STL Lambert-St Louis - YOW Ottawa

STLYOW

Lambert-St Louis

Mon 11/23

7:30 am-9:16 pm

1 stop12h 46m

Ottawa

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$405

St. LouisOttawa

STL Lambert-St Louis - YOW Ottawa

STLYOW

Lambert-St Louis

Mon 11/16

7:59 pm-11:19 pm

3 stops50h 20m

Ottawa

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$406

St. LouisOttawa

STL Lambert-St Louis - YOW Ottawa

STLYOW

Lambert-St Louis

Mon 11/16

5:00 am-9:16 pm

1 stop15h 16m

Ottawa

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$423

St. LouisOttawa

STL Lambert-St Louis - YOW Ottawa

STLYOW

Lambert-St Louis

Sat 11/21

5:15 pm-5:15 pm

3 stops23h 00m

Ottawa

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$433

St. LouisOttawa

STL Lambert-St Louis - YOW Ottawa

STLYOW

Lambert-St Louis

Sat 11/21

9:40 am-9:16 pm

1 stop10h 36m

Ottawa

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$515

St. LouisOttawa

STL Lambert-St Louis - YOW Ottawa

STLYOW

Lambert-St Louis

Thu 12/24

5:58 pm-2:30 pm

1 stop19h 32m

Ottawa

Thu 12/31

5:40 pm-12:41 am

2 stops32h 01m

$615

St. LouisOttawa

STL Lambert-St Louis - YOW Ottawa

STLYOW

Lambert-St Louis

Wed 12/9

12:02 pm-11:33 am

3 stops22h 31m

Ottawa

Wed 12/16

7:00 am-4:50 pm

3 stops34h 50m

$693

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/10

Showing 1-10 of 14 resultsSorted by cheapest first

Compare providers for flights from St. Louis to Ottawa

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Ottawa in November.

Provider	Price Accuracy	Trust Score*
FlightHub	Price Accuracy3 stars	Trust Score*3 stars
eDreams	Price Accuracy2 stars	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on St. Louis-Ottawa flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Ottawa flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Ottawa flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on St. Louis-Ottawa flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Ottawa flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from St. Louis to Ottawa

Have a flexible travel schedule? Discover the best time to fly to Ottawa from St. Louis with our price prediction graph.

STL-YOW

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Reviews of airlines servicing Ottawa

Get a feel of what it's like to fly with United Airlines and Air Canada from St. Louis to Ottawa by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

United Airlines

7.3

Good

10,474 reviews

Reviews

1 / 20

6.0

Good

Miz,Oct 2024

EWR - YYZ

I booked on United but it was really Air Canada. It was very confusing when I went to the airport. The ride to NY was very turbulent and shaky. The ride back was better. It would be nicer with more leg room and to get rid of the tilting the seat back thing. Fine for an hour flight but any longer would have been not great. Please put subtitles on the programs so we don;t have t use headphones if we forget them.

United Airlines

7.3

Good

10,474 reviews

United Airlines

7.3

Good

10,474 reviews

Reviews

1 / 20

6.0

Good

Miz,Oct 2024

EWR - YYZ

Air Canada

7.1

Good

11,885 reviews

United Airlines

7.3

Good

10,474 reviews

Reviews

1 / 20

6.0

Good

Miz,Oct 2024

EWR - YYZ

Related info for your journey

How long is the flight from St. Louis to Ottawa?
A quick flight from St. Louis to Ottawa can take about 14h 47m. United Airlines provides one of the quickest options available for as low as $749. St. Louis and Ottawa are separated by a distance of 878 mi.
What are the cheapest airlines flying from St. Louis to Ottawa round-trip?
Currently priced at $139, Air Canada will fly you from St. Louis to Ottawa and back. In addition to Air Canada, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on United Airlines for as low as $203. Air Canada is 77% cheaper than the average price of flights available within the next 90 days to this destination.
Can I find deals for flights from St. Louis to Ottawa that include hotel bookings?
Yes. In addition to deals on St. Louis to Ottawa flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from St. Louis to Ottawa?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Ottawa.
Can I find deals for business class flights from St. Louis to Ottawa?
Yes. Cheapflights offers flight deals from St. Louis to Ottawa by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Gatineau

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Alternative routes

Complete your trip

Flights by cabin class

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Other flights from St. Louis

Ottawa flight routes

Popular flights

Alternative routes for St. Louis to Ottawa

St. Louis to Pearson Intl flights

Kansas City to Pierre Elliott Trudeau Intl flights

St. Louis to Pierre Elliott Trudeau Intl flights

Kansas City to Pearson Intl flights

Kansas City to Toronto Island flights

Columbia to Pearson Intl flights

Kansas City to Ottawa flights

Columbia to Pierre Elliott Trudeau Intl flights

Top 2 airlines flying from St. Louis to Ottawa

Airline	Cheapest	Average	Flexibility	On-time
Air Canada	Cheapest$139	Average$489	FlexibilityNo cancel fee	On-time67%
United Airlines	Cheapest$203	Average$709	FlexibilityNo cancel fee	On-time69%

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$301+ Cheap flights from St. Louis (STL) to Ottawa (YOW)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/25. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from St. Louis to Ottawa with Cheapflights

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Cheap flight deals from St. Louis to Ottawa

Cheapest flights from St. Louis to OttawaExplore the most affordable flight options available from St. Louis to Ottawa. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 11, 2026.

Explore the most affordable flight options available from St. Louis to Ottawa. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 11, 2026.

Best flights from St. Louis to OttawaDiscover carefully curated flight deals from St. Louis to Ottawa that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 11, 2026.

Discover carefully curated flight deals from St. Louis to Ottawa that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 11, 2026.

Last-minute flights from St. Louis to OttawaDiscover last-minute flight deals from St. Louis to Ottawa. Data last updated November 11, 2026 and is based on user searches.

Discover last-minute flight deals from St. Louis to Ottawa. Data last updated November 11, 2026 and is based on user searches.

One-way flights from St. Louis to OttawaSearch for one-way flight options from St. Louis to Ottawa. Find affordable one-way fares based on user searches. Data last updated November 11, 2026.

Search for one-way flight options from St. Louis to Ottawa. Find affordable one-way fares based on user searches. Data last updated November 11, 2026.

Find flight deals from St. Louis to Ottawa

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Most trusted provider

Round-trip from

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Cheapflights Fare Finder

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

Compare providers for flights from St. Louis to Ottawa

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Ottawa in November.

Best time to book a flight from St. Louis to Ottawa

Have a flexible travel schedule? Discover the best time to fly to Ottawa from St. Louis with our price prediction graph.

Reviews of airlines servicing Ottawa

Get a feel of what it's like to fly with United Airlines and Air Canada from St. Louis to Ottawa by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

How long is the flight from St. Louis to Ottawa?

What are the cheapest airlines flying from St. Louis to Ottawa round-trip?

Can I find deals for flights from St. Louis to Ottawa that include hotel bookings?

How can I find direct flights from St. Louis to Ottawa?

Can I find deals for business class flights from St. Louis to Ottawa?

Traveling to a place near Ottawa?

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for St. Louis to Ottawa

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to Ottawa by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from St. Louis to Ottawa by cabin class

Find flights from St. Louis to Ottawa, based on your preferred cabin class, be it economy, premium economy, business, or first class.

St. Louis and Ottawa flights

Browse other St. Louis and Ottawa flight options. Last updated on November 11, 2026.

Other flights from St. Louis

Browse through other flights departing from St. Louis. Flights are based on user searches made on Cheapflights and were last updated on November 11, 2026.

Other flights to Ottawa

Explore flights to Ottawa departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on November 11, 2026.

Popular flight searches

Check out other popular destinations found by fellow travelers in 2026

Top 2 airlines flying from St. Louis to Ottawa

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Cheapest flights from St. Louis to Ottawa
Explore the most affordable flight options available from St. Louis to Ottawa. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 11, 2026.

Best flights from St. Louis to Ottawa
Discover carefully curated flight deals from St. Louis to Ottawa that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 11, 2026.

Last-minute flights from St. Louis to Ottawa
Discover last-minute flight deals from St. Louis to Ottawa. Data last updated November 11, 2026 and is based on user searches.

One-way flights from St. Louis to Ottawa
Search for one-way flight options from St. Louis to Ottawa. Find affordable one-way fares based on user searches. Data last updated November 11, 2026.