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Cheap flights from St. Louis to Toronto from C$ 143

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 3/10. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YTO
11 Oct — 18 Oct1
1 adult
1 adult, Economy

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 Wednesday and return on a Thursday

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 11 September 2025.

Round-trip from

C$ 362

One-way from

C$ 143

Popular in

March

Cheapest in

November

Average price

C$ 676

Good round-trip deal

C$ 841 or less

Good one-way deal

C$ 350 or less
9/10-16/10
  • 9/10-16/10
  • 3 total stops
  • 35h 08m total
  • St. Louis to Toronto
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3/10
  • 3/10
  • 2 total stops
  • 22h 17m total
  • St. Louis to Toronto
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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 (C$ 29 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 11 September 2025.

Thu 9/1010:57 a.m.STL - YYZ
1 stop11h 55mMultiple Airlines
Thu 16/101:30 p.m.YYZ - STL
2 stops23h 13mMultiple Airlines
Deal found 9/9C$ 362
Thu 30/1010:57 a.m.STL - YYZ
1 stop26h 43mMultiple Airlines
Sun 2/114:00 p.m.YYZ - STL
2 stops42h 07mMultiple Airlines
Deal found 11/9C$ 396
Thu 16/1010:57 a.m.STL - YYZ
1 stop11h 55mMultiple Airlines
Sun 19/104:00 p.m.YYZ - STL
2 stops27h 36mMultiple Airlines
Deal found 9/9C$ 428
Thu 23/1010:57 a.m.STL - YYZ
1 stop26h 08mMultiple Airlines
Sun 26/108:00 p.m.YYZ - STL
2 stops24h 26mMultiple Airlines
Deal found 11/9C$ 432
Fri 17/106:00 a.m.STL - YYZ
1 stop10h 40mAmerican Airlines
Tue 21/1011:44 a.m.YYZ - STL
1 stop9h 42mAmerican Airlines
Deal found 9/9C$ 457
Thu 9/1010:57 a.m.STL - YYZ
1 stop11h 55mMultiple Airlines
Mon 13/104:00 p.m.YYZ - STL
2 stops42h 07mMultiple Airlines
Deal found 11/9C$ 459
Wed 24/97:55 p.m.STL - YYZ
2 stops23h 03mMultiple Airlines
Sat 4/109:35 a.m.YYZ - STL
1 stop25h 27mMultiple Airlines
Deal found 10/9C$ 467
Fri 17/106:00 a.m.STL - YYZ
1 stop10h 40mAmerican Airlines
Thu 30/106:30 a.m.YYZ - STL
1 stop10h 34mAmerican Airlines
Deal found 9/9C$ 479
Fri 3/109:32 p.m.STL - YYZ
1 stop15h 20mMultiple Airlines
Mon 6/104:00 p.m.YYZ - STL
2 stops27h 36mMultiple Airlines
Deal found 9/9C$ 482
Thu 23/1010:57 a.m.STL - YYZ
1 stop8h 58mMultiple Airlines
Sat 25/102:50 p.m.YYZ - STL
2 stops19h 32mMultiple Airlines
Deal found 10/9C$ 484

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 629,999 searches. Data last updated 11 September 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 23/10

10:57 a.m.-2:05 p.m.

1 stop26h 08m

Toronto Pearson Intl

Sun 26/10

8:00 p.m.-7:26 p.m.

2 stops24h 26m

C$ 432

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Fri 17/10

6:00 a.m.-5:40 p.m.

1 stop10h 40m

Toronto Pearson Intl

Tue 21/10

11:44 a.m.-8:26 p.m.

1 stop9h 42m

C$ 457

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 9/10

10:57 a.m.-11:52 p.m.

1 stop11h 55m

Toronto Pearson Intl

Sat 11/10

6:30 a.m.-6:10 p.m.

1 stop12h 40m

C$ 567

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 23/10

9:50 a.m.-9:07 p.m.

2 stops10h 17m

Toronto Pearson Intl

Sat 25/10

12:00 p.m.-10:02 a.m.

3 stops23h 02m

C$ 572

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 9/10

10:57 a.m.-10:40 p.m.

2 stops10h 43m

Toronto Pearson Intl

Thu 16/10

6:30 a.m.-12:00 p.m.

3 stops30h 30m

C$ 612

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Wed 8/10

5:00 a.m.-11:49 a.m.

1 stop5h 49m

Toronto Pearson Intl

Sat 11/10

2:15 p.m.-3:18 p.m.

Nonstop2h 03m

C$ 633

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Sat 18/10

6:00 a.m.-4:34 p.m.

1 stop9h 34m

Toronto Pearson Intl

Sun 19/10

1:15 p.m.-8:26 p.m.

1 stop8h 11m

C$ 640

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Sat 11/10

6:00 a.m.-4:34 p.m.

1 stop9h 34m

Toronto Pearson Intl

Sun 12/10

11:44 a.m.-4:04 p.m.

1 stop5h 20m

C$ 640

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Wed 3/12

6:00 a.m.-4:24 p.m.

1 stop9h 24m

Toronto Pearson Intl

Fri 5/12

6:05 a.m.-8:17 p.m.

1 stop15h 12m

C$ 644

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Wed 24/9

3:20 p.m.-8:44 p.m.

1 stop4h 24m

Toronto Pearson Intl

Sun 28/9

7:00 a.m.-10:49 a.m.

1 stop4h 49m

C$ 647

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 17 results
1
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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 29 August 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 C$ 168). Flying from St. Louis to Toronto in July is currently the most expensive (average of C$ 258). 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 11 September 2025.

One of the essential ways to save on airfare from St. Louis to Toronto is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 25% on airfare.

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 11 September 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).

What’s the top layover airport for flights from St. Louis to Toronto?

Share of one-stop round-trip flights from St. Louis to Toronto chosen by Cheapflights users in the past 12 months, using the same layover each way.

Chicago (ORD) – chosen by Cheapflights users on 67% of one-stop itineraries from St. Louis to Toronto on Cheapflights.

What’s the cheapest layover airport for flights from St. Louis to Toronto?

Average round-trip fare for 1-stop flights from St. Louis to Toronto, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Chicago (ORD) is the most affordable 1-stop option, with an average round-trip price of C$ 698.

What’s the fastest layover option from St. Louis to Toronto?

Shortest average travel time for 1-stop one-way flights from St. Louis to Toronto, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Chicago (ORD) have the shortest average one-way travel time for 1-stop routes: 5h 29m.

Which airport typically offers the quickest layover for flights from St. Louis to Toronto?

Average layover duration for 1-stop one-way flights from St. Louis to Toronto, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Toronto (YYZ) offer the fastest connection on this route, with an average layover time of 2h 08m.

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 11 September 2025.
Check out reviews from past customers who have flown with Air Canada from St. Louis to Toronto to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Air Canada
7.1
Good
10,000 reviews
Check prices

Crew

7.8

Food

6.3

Overall

7.1

Boarding

7.3

Comfort

7.1

Entertainment

6.8

Reviews

1 / 20
10.0
Excellent

janet,Sep 2025

YOW - YYZ

Really appreciated the leg room despite purchasing an economy ticket. Appreciated the extra complimentary wine. Nice touch. Was given immediate support without asking at check in, at the machine!! Ottawa's boarding was very organized with distinct rows in waiting room. Allowed for the main hall to not be blocked by people waiting to board.
Air Canada
7.1
Good
10,000 reviews
Air Canada
7.1
Good
10,000 reviews
Check prices

Crew

7.8

Food

6.3

Overall

7.1

Boarding

7.3

Comfort

7.1

Entertainment

6.8

Reviews

1 / 20
10.0
Excellent

janet,Sep 2025

YOW - YYZ

Really appreciated the leg room despite purchasing an economy ticket. Appreciated the extra complimentary wine. Nice touch. Was given immediate support without asking at check in, at the machine!! Ottawa's boarding was very organized with distinct rows in waiting room. Allowed for the main hall to not be blocked by people waiting to board.

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?

    Most people fly from Lambert-St Louis (STL) if they book a flight from St. Louis to Toronto. On average, Lambert-St Louis has 5 outbound flights to Toronto per day from 1 airline. Lambert-St Louis is conveniently located just 20.4 km from St. Louis’s city centre.

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

    A quick flight from St. Louis to Toronto can take about 10h 40m. American Airlines provides one of the quickest options available for as low as C$ 457. The distance between St. Louis and Toronto is about 1051 km.

  • What is the cheapest airline to fly from St. Louis to Toronto round-trip?

    Our cheapest airline available from St. Louis to Toronto is Air Canada. Our recent data shows that you can find tickets from as low as C$ 302 on this airline. Users have found that Air Canada is 48% cheaper than the other options available to this destination.

  • 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?

    While on average a flight from St. Louis to Toronto is generally C$ 827, our data shows the cheapest flight currently is C$ 350. When looking at the most popular route, (Lambert-St Louis - Toronto Pearson Intl), you can expect to pay C$ 362 for that flight.

  • 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 C$ 168). Flying from St. Louis to Toronto in July is currently the most expensive (average of C$ 258). 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 airline flying from St. Louis to Toronto

Discover the top airline 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 629,999 searches. Data last updated 11 September 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 302AverageC$ 672FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

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