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$103+ 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 10/24. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YTO
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Toronto are usually found in November or January, booked 52 days in advance, depart on a Tuesday or Thursday and return on a Tuesday

Cheap 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 September 11, 2025.

Round-trip from

$261
(Kiwi.com)

One-way from

$103
(Kiwi.com)

Popular in

March

Cheapest in

November

Average price

$488

Good round-trip deal

$672 or less

Good one-way deal

$349 or less
From Lambert-St Louis to Toronto (YTO)
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One-way flight from Lambert-St Louis to Toronto (YTO)
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High demand for flights, 1% potential price rise
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Cheapest flight prices on average. 3% potential price decrease ($15 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Lambert-St Louis to Toronto (YTO).
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Price to beat on a one-way flight from Lambert-St Louis to Toronto (YTO).
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Find 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 September 11, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/9. 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.
Thu 10/910:57 amSTL - YYZ
1 stop11h 55mMultiple Airlines
Thu 10/161:30 pmYYZ - STL
2 stops23h 13mMultiple Airlines
Deal found 9/9$261
This Kiwi.com deal was found by Cheapflights users on 9/11. 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 10/3010:57 amSTL - YYZ
1 stop26h 43mMultiple Airlines
Sun 11/24:00 pmYYZ - STL
2 stops42h 07mMultiple Airlines
Deal found 9/11$286
This Kiwi.com deal was found by Cheapflights users on 9/9. 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.
Thu 10/1610:57 amSTL - YYZ
1 stop11h 55mMultiple Airlines
Sun 10/194:00 pmYYZ - STL
2 stops27h 36mMultiple Airlines
Deal found 9/9$309
This Kiwi.com deal was found by Cheapflights users on 9/11. 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 10/2310:57 amSTL - YYZ
1 stop26h 08mMultiple Airlines
Sun 10/268:00 pmYYZ - STL
2 stops24h 26mMultiple Airlines
Deal found 9/11$312
This American Airlines deal was found by Cheapflights users on 9/9. 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.
Fri 10/176:00 amSTL - YYZ
1 stop10h 40mAmerican Airlines
Tue 10/2111:44 amYYZ - STL
1 stop9h 42mAmerican Airlines
Deal found 9/9$330
This Kiwi.com deal was found by Cheapflights users on 9/11. 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 10/910:57 amSTL - YYZ
1 stop11h 55mMultiple Airlines
Mon 10/134:00 pmYYZ - STL
2 stops42h 07mMultiple Airlines
Deal found 9/11$331
This Kiwi.com deal was found by Cheapflights users on 9/10. 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.
Wed 9/247:55 pmSTL - YYZ
2 stops23h 03mMultiple Airlines
Sat 10/49:35 amYYZ - STL
1 stop25h 27mMultiple Airlines
Deal found 9/10$337
This American Airlines deal was found by Cheapflights users on 9/9. 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.
Fri 10/176:00 amSTL - YYZ
1 stop10h 40mAmerican Airlines
Thu 10/306:30 amYYZ - STL
1 stop10h 34mAmerican Airlines
Deal found 9/9$346
This Kiwi.com deal was found by Cheapflights users on 9/9. 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.
Fri 10/39:32 pmSTL - YYZ
1 stop15h 20mMultiple Airlines
Mon 10/64:00 pmYYZ - STL
2 stops27h 36mMultiple Airlines
Deal found 9/9$348
This Kiwi.com deal was found by Cheapflights users on 9/10. 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.
Thu 10/2310:57 amSTL - YYZ
1 stop8h 58mMultiple Airlines
Sat 10/252:50 pmYYZ - STL
2 stops19h 32mMultiple Airlines
Deal found 9/10$349

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 September 11, 2025.
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

Thu 10/23

10:57 am-11:52 pm

1 stop11h 55m

Toronto Pearson Intl

Sat 10/25

12:00 pm-10:02 am

3 stops23h 02m

$379

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 10/9

10:57 am-11:52 pm

1 stop11h 55m

Toronto Pearson Intl

Sat 10/11

6:30 am-6:10 pm

1 stop12h 40m

$409

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Fri 10/17

5:30 am-11:10 am

1 stop4h 40m

Toronto Pearson Intl

Thu 10/30

1:15 pm-11:54 pm

1 stop11h 39m

$428

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 10/9

10:57 am-10:40 pm

2 stops10h 43m

Toronto Pearson Intl

Thu 10/16

6:30 am-12:00 pm

3 stops30h 30m

$442

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 10/23

10:57 am-11:52 pm

1 stop11h 55m

Toronto Pearson Intl

Sun 10/26

2:00 pm-3:29 pm

Nonstop2h 29m

$451

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Wed 10/8

5:00 am-11:49 am

1 stop5h 49m

Toronto Pearson Intl

Sat 10/11

2:15 pm-3:18 pm

Nonstop2h 03m

$457

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Sat 10/11

6:00 am-4:34 pm

1 stop9h 34m

Toronto Pearson Intl

Sun 10/12

11:44 am-4:04 pm

1 stop5h 20m

$462

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Wed 12/3

6:00 am-4:24 pm

1 stop9h 24m

Toronto Pearson Intl

Fri 12/5

6:05 am-8:17 pm

1 stop15h 12m

$465

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 10/7

7:52 pm-7:58 pm

2 stops23h 06m

Toronto Pearson Intl

Tue 10/14

6:15 am-9:37 am

1 stop4h 22m

$465

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Wed 9/24

3:20 pm-8:44 pm

1 stop4h 24m

Toronto Pearson Intl

Sun 9/28

7:00 am-10:49 am

1 stop4h 49m

$467

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 16 results
1
2

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 August 29, 2025.

Booking 52 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, January is the cheapest month in which you can book a flight from St. Louis to Toronto (average of $243). Flying from St. Louis to Toronto in August is currently the most expensive (average of $348). 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 September 11, 2025.

It’s typically best to fly out from St. Louis to Toronto in the afternoon. Doing so could potentially save you 24% on the flight price compared to flying at noon, which is usually more expensive.

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 September 11, 2025.

The most flights from STL to YTO are scheduled on a Monday (5 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (5 on average).

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 September 11, 2025.
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
8.0
Very good
7,960 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

7.9

Boarding

8.2

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,960 reviews
Delta
8.0
Very good
7,960 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

7.9

Boarding

8.2

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,937 reviews
Delta
8.0
Very good
7,960 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

7.9

Boarding

8.2

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,960 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

7.9

Boarding

8.2

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Air Canada
7.1
Good
10,000 reviews
Delta
8.0
Very good
7,960 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

7.9

Boarding

8.2

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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 5 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 $428, American Airlines can have you in Toronto from St. Louis in 4h 40m. 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 $214 on this airline. Additional options worth looking into are Air Canada and American Airlines, starting at $220 and $330 round-trip. United Airlines is currently priced 49% below the average price you’ll pay for this route.

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

    Consider Air Canada (86%), Jazz (86%) or United Airlines (57%) 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 $252. On average you can expect to pay $1,023. The most popular route, (Lambert-St Louis - Toronto Pearson Intl), can usually be booked for $261.

  • 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, January is the cheapest month in which you can book a flight from St. Louis to Toronto (average of $243). Flying from St. Louis to Toronto in August is currently the most expensive (average of $348). 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

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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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$214Average$511FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$220Average$502FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$330Average$612FlexibilityNo cancel feeOn-time71%

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