HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Toronto

$139+ Cheap flights from St. Louis (STL) to Toronto (YTO)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/18. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YTO
Mar 14 — Mar 211
Sat 3/14
Sat 3/21
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from St. Louis to Toronto with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.
Cheapflights Tip: The best prices from Lambert-St Louis to Toronto are usually found in June or April, booked 46 days in advance, depart on a Tuesday or Sunday and return on a Sunday

Cheap flight deals from St. Louis to Toronto

Cheapest flights from St. Louis to Toronto
Explore the most affordable flight options available from St. Louis to Toronto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 12, 2026.

This Kiwi.com deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/104:51 pm
STL
-
YYZ
1 stop17h 35m
Multiple Airlines
Tue 3/173:40 pm
YYZ
-
STL
2 stops19h 57m
Multiple Airlines
Deal found 2/9$297
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/33:49 pm
STL
-
YYZ
1 stop7h 25m
Multiple Airlines
Fri 3/68:00 pm
YYZ
-
STL
1 stop16h 19m
Multiple Airlines
Deal found 2/10$298
This Kiwi.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/2611:21 am
STL
-
YYZ
2 stops25h 59m
Multiple Airlines
Mon 3/307:55 pm
YYZ
-
STL
1 stop16h 24m
Multiple Airlines
Deal found 2/11$311
This Kiwi.com deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/158:06 pm
STL
-
YYZ
1 stop22h 49m
Multiple Airlines
Tue 3/173:40 pm
YYZ
-
STL
2 stops19h 57m
Multiple Airlines
Deal found 2/9$315
This Kiwi.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/2411:27 am
STL
-
YYZ
2 stops35h 47m
Multiple Airlines
Mon 3/307:55 pm
YYZ
-
STL
1 stop16h 24m
Multiple Airlines
Deal found 2/11$324
This Kiwi.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/2512:14 pm
STL
-
YYZ
2 stops30h 22m
Multiple Airlines
Mon 3/307:55 pm
YYZ
-
STL
1 stop16h 24m
Multiple Airlines
Deal found 2/11$325
This American Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/108:00 am
STL
-
YYZ
1 stop8h 36m
American Airlines
Tue 3/1711:40 am
YYZ
-
STL
1 stop13h 04m
American Airlines
Deal found 2/9$326
This American Airlines deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/112:05 pm
STL
-
YYZ
1 stop8h 24m
American Airlines
Sat 4/41:10 pm
YYZ
-
STL
1 stop9h 01m
American Airlines
Deal found 2/8$327
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/28:22 pm
STL
-
YYZ
2 stops26h 52m
Multiple Airlines
Fri 3/68:00 pm
YYZ
-
STL
1 stop16h 19m
Multiple Airlines
Deal found 2/10$330
This Kiwi.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/2712:14 pm
STL
-
YYZ
1 stop17h 29m
Multiple Airlines
Mon 3/307:10 am
YYZ
-
STL
2 stops28h 22m
Multiple Airlines
Deal found 2/11$334

Find flight deals from St. Louis to Toronto

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Toronto (YTO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated February 12, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$297
(Kiwi.com)

One-way from

$139
(Kiwi.com)

Popular in

November

Cheapest in

June

Average price

$463

Good round-trip deal

$651 or less

Good one-way deal

$309 or less
Provider with most accurate pricing for Lambert-St Louis-Toronto (YTO) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Toronto (YTO) flights.
Search Deals
From Lambert-St Louis to Toronto (YTO)
Search Deals
One-way flight from Lambert-St Louis to Toronto (YTO)
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($60 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals
Price to beat on a round-trip flight from Lambert-St Louis to Toronto (YTO).
Search Deals
Price to beat on a one-way flight from Lambert-St Louis to Toronto (YTO).
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Toronto 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, Cheapflights users made 2,558,603 searches. Data last updated February 12, 2026.
Use the filters below to find and compare flights from St. Louis to Toronto that are best for you.

Fly from

St. Louis

Fly to

Toronto

Route

Depart

Return

Price

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 3/3

3:49 pm-12:14 am

1 stop7h 25m

Toronto Pearson Intl

Fri 3/6

8:00 pm-11:19 am

1 stop16h 19m

$310

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Wed 3/4

9:37 am-9:29 pm

1 stop10h 52m

Toronto Pearson Intl

Wed 3/11

11:40 am-11:44 pm

1 stop13h 04m

$337

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Fri 2/27

11:41 am-9:37 pm

1 stop8h 56m

Toronto Pearson Intl

Tue 3/3

1:10 pm-9:12 pm

1 stop9h 02m

$417

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Fri 3/27

12:14 pm-6:43 am

1 stop17h 29m

Toronto Pearson Intl

Fri 4/3

7:45 am-3:13 pm

1 stop8h 28m

$449

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 3/24

11:27 am-10:40 pm

2 stops10h 13m

Toronto Pearson Intl

Thu 4/2

6:08 pm-8:42 pm

1 stop3h 34m

$456

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Sun 3/8

6:00 am-4:03 pm

1 stop9h 03m

Toronto Pearson Intl

Sun 3/15

6:00 am-10:03 am

1 stop5h 03m

$464

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Mon 3/9

9:37 am-9:29 pm

1 stop10h 52m

Toronto Pearson Intl

Sun 3/15

12:35 pm-11:02 pm

1 stop11h 27m

$475

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Mon 3/2

2:47 pm-3:35 pm

1 stop23h 48m

Toronto Pearson Intl

Wed 3/4

4:45 pm-11:59 pm

1 stop32h 14m

$479

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Wed 4/1

8:30 am-2:19 pm

1 stop4h 49m

Toronto Pearson Intl

Wed 4/1

5:15 pm-9:08 pm

1 stop4h 53m

$483

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Wed 3/4

4:05 pm-7:06 pm

Nonstop2h 01m

Toronto Pearson Intl

Wed 3/11

2:00 pm-3:29 pm

Nonstop2h 29m

$483

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/10

Showing 1-10 of 20 results
1
2

Compare providers for flights from St. Louis to Toronto

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 Toronto in February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust 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-Toronto flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Toronto flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Toronto flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-Toronto 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-Toronto 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 Toronto

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

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Toronto

How far ahead should I book a flight from St. Louis to Toronto?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Toronto. Price data was last updated on February 6, 2026.

Booking 46 days in advance of your planned departure date is, on average, the best time to get cheap flights from St. Louis to Toronto. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from St. Louis to Toronto?

Currently, June is the cheapest month in which you can book a flight from St. Louis to Toronto (average of $177). Flying from St. Louis to Toronto in January is currently the most expensive (average of $781). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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

Find hourly flight availability from St. Louis to Toronto. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated February 12, 2026.

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

Weekly flight availability from St. Louis to Toronto

Explore weekly flight availability from St. Louis to Toronto. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated February 12, 2026.

The most flights from STL to YTO are scheduled on a Monday (2 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (2 on average).

How much does it cost to fly round-trip from St. Louis to Toronto?

Reviews of airlines servicing Toronto

Get insights into the airlines that provide service to Toronto. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Toronto. Reviews last updated February 12, 2026.
Read through reviews of airlines operating flights from St. Louis to Toronto, such as Delta, United Airlines, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,181 reviews

Overall

7.9

Comfort

7.9

Crew

8.5

Boarding

8.1

Entertainment

7.8

Food

7.2

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,181 reviews
Delta
7.9
Good
8,181 reviews

Overall

7.9

Comfort

7.9

Crew

8.5

Boarding

8.1

Entertainment

7.8

Food

7.2

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,279 reviews
Delta
7.9
Good
8,181 reviews

Overall

7.9

Comfort

7.9

Crew

8.5

Boarding

8.1

Entertainment

7.8

Food

7.2

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
American Airlines
7.2
Good
11,271 reviews
Delta
7.9
Good
8,181 reviews

Overall

7.9

Comfort

7.9

Crew

8.5

Boarding

8.1

Entertainment

7.8

Food

7.2

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Air Canada
7.1
Good
10,709 reviews
Delta
7.9
Good
8,181 reviews

Overall

7.9

Comfort

7.9

Crew

8.5

Boarding

8.1

Entertainment

7.8

Food

7.2

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Toronto. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from St. Louis to Toronto?

    Lambert-St Louis (STL) is the airport you will fly out of if you book a flight from St. Louis to Toronto. You should not have trouble finding flights to Toronto from Lambert-St Louis; the airport handles an average of 2 outbound flights to Toronto per day. You should also have plenty of airline options to choose from since 3 airlines have flights from the St. Louis airport to Toronto. It is only a 12.7 mi journey to Lambert-St Louis (STL) from St. Louis’s city center.

  • How long is the flight from St. Louis to Toronto?

    For as low as $337, American Airlines can have you in Toronto from St. Louis in 10h 52m. St. Louis and Toronto are separated by a distance of 653 mi.

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

    Our cheapest airline available from St. Louis to Toronto is United Airlines. Our recent data shows that you can find tickets from as low as $199 on this airline. Additional options worth looking into are Air Canada and American Airlines, starting at $214 and $270 round-trip. United Airlines is currently priced 60% below the average price you’ll pay for this route.

  • What are the most reliable airlines from St. Louis to Toronto?

    Consider Air Canada (58%), Jazz (58%) or United Airlines (58%) when booking your flight. These represent the most reliable airlines when flying from St. Louis to Toronto.

  • What are the cheapest flights from St. Louis to Toronto?

    The cheapest flight price from St. Louis to Toronto is $243. On average you can expect to pay $612. The most popular route, (Lambert-St Louis - Toronto Pearson Intl), can usually be booked for $298.

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

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

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

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

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

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

  • What is the cheapest month to book a flight from St. Louis to Toronto?

    Currently, June is the cheapest month in which you can book a flight from St. Louis to Toronto (average of $177). Flying from St. Louis to Toronto in January is currently the most expensive (average of $781). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 3 airlines flying from St. Louis to Toronto

Discover the top 3 airlines that operate flights from St. Louis to Toronto. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 12, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$199Average$389FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$214Average$493FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$270Average$558FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
Site
©2026 Cheapflights