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Cheap flights from St. Louis to Toronto from C$ 203

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 16/9. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YTO
22 Aug — 29 Aug1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Lambert-St Louis to Toronto are usually found in December or January, booked 53 days in advance, depart on a Wednesday or Thursday and return on a Saturday

Cheap flight deals from St. Louis to Toronto

Enter your travel dates to find the best prices.

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 23 July 2026.

Sat 5/95:00 a.m.
STL
-
YYZ
1 stop8h 33m
American Airlines
Sat 12/93:13 p.m.
YYZ
-
STL
1 stop10h 14m
American Airlines
Deal found 23/7C$ 500
Wed 26/89:32 a.m.
STL
-
YYZ
1 stop7h 58m
American Airlines
Sat 5/91:15 p.m.
YYZ
-
STL
1 stop11h 43m
American Airlines
Deal found 22/7C$ 533
Mon 17/86:00 a.m.
STL
-
YYZ
1 stop7h 33m
American Airlines
Mon 24/83:14 p.m.
YYZ
-
STL
1 stop10h 00m
American Airlines
Deal found 21/7C$ 548
Wed 26/89:32 a.m.
STL
-
YYZ
1 stop7h 58m
American Airlines
Sun 6/97:20 a.m.
YYZ
-
STL
1 stop10h 00m
American Airlines
Deal found 22/7C$ 554
Tue 11/86:00 a.m.
STL
-
YYZ
1 stop7h 33m
American Airlines
Thu 13/81:15 p.m.
YYZ
-
STL
1 stop11h 59m
American Airlines
Deal found 21/7C$ 564
Tue 27/1010:35 a.m.
STL
-
YYZ
2 stops26h 20m
Multiple Airlines
Fri 30/106:30 a.m.
YYZ
-
STL
1 stop14h 09m
Multiple Airlines
Deal found 20/7C$ 579
Wed 9/910:35 a.m.
STL
-
YYZ
2 stops26h 30m
Multiple Airlines
Sun 13/97:45 a.m.
YYZ
-
STL
1 stop12h 54m
Multiple Airlines
Deal found 19/7C$ 583
Thu 10/98:34 p.m.
STL
-
YYZ
1 stop19h 11m
Multiple Airlines
Thu 17/91:30 p.m.
YYZ
-
STL
2 stops21h 10m
Multiple Airlines
Deal found 18/7C$ 590
Thu 17/910:35 a.m.
STL
-
YYZ
2 stops29h 20m
Multiple Airlines
Mon 21/99:50 a.m.
YYZ
-
STL
1 stop10h 49m
Multiple Airlines
Deal found 22/7C$ 598
Fri 2/1010:35 a.m.
STL
-
YYZ
2 stops26h 30m
Multiple Airlines
Mon 5/107:45 a.m.
YYZ
-
STL
1 stop12h 54m
Multiple Airlines
Deal found 23/7C$ 602
Thu 29/108:34 p.m.
STL
-
YYZ
1 stop16h 31m
Multiple Airlines
Fri 13/114:20 p.m.
YYZ
-
STL
2 stops18h 20m
Multiple Airlines
Deal found 22/7C$ 603
Sun 6/92:10 p.m.
STL
-
YYZ
2 stops30h 45m
Multiple Airlines
Sun 13/94:50 p.m.
YYZ
-
STL
1 stop27h 49m
Multiple Airlines
Deal found 23/7C$ 622

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 23 July 2026.

Round-trip from

C$ 500

One-way from

C$ 203

Popular in

August

Cheapest in

December

Average price

C$ 922

Good one-way deal

C$ 260 or less
American Airlines
  • American Airlines
  • 5/9-12/9
  • 2 total stops
  • 18h 47m total
  • St. Louis to Toronto
Search Deals
American Airlines
  • American Airlines
  • 16/9
  • 1 total stop
  • 8h 32m total
  • St. Louis to Toronto
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (C$ 87 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
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 629,999 searches. Data last updated 23 July 2026.
Use the filters below to find and compare flights from St. Louis to Toronto that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Mon 28/9

7:21 a.m.-6:35 p.m.

1 stop10h 14m

Toronto Pearson Intl

Mon 5/10

12:47 p.m.-8:52 p.m.

1 stop9h 05m

C$ 737

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 15/9

8:00 a.m.-5:01 p.m.

1 stop8h 01m

Toronto Pearson Intl

Sat 19/9

8:50 a.m.-3:38 p.m.

1 stop7h 48m

C$ 844

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 11/8

8:50 a.m.-3:46 p.m.

1 stop5h 56m

Toronto Pearson Intl

Tue 11/8

7:15 p.m.-8:24 p.m.

Nonstop2h 09m

C$ 946
Quickest round-trip

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 1/9

5:30 p.m.-11:59 p.m.

1 stop5h 29m

Toronto Pearson Intl

Mon 7/9

12:55 p.m.-2:02 p.m.

Nonstop2h 07m

C$ 958

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 27/10

5:34 p.m.-11:59 p.m.

1 stop5h 25m

Toronto Pearson Intl

Fri 30/10

2:10 p.m.-3:26 p.m.

Nonstop2h 16m

C$ 965

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Fri 11/9

5:30 p.m.-12:13 a.m.

1 stop5h 43m

Toronto Pearson Intl

Sat 12/9

12:55 p.m.-2:00 p.m.

Nonstop2h 05m

C$ 974

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Fri 28/8

5:30 p.m.-11:59 p.m.

1 stop5h 29m

Toronto Pearson Intl

Mon 31/8

7:15 p.m.-8:24 p.m.

Nonstop2h 09m

C$ 974

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Fri 21/8

5:30 p.m.-11:59 p.m.

1 stop5h 29m

Toronto Pearson Intl

Fri 28/8

7:15 p.m.-8:24 p.m.

Nonstop2h 09m

C$ 974

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Sun 6/9

6:00 a.m.-11:49 a.m.

1 stop4h 49m

Toronto Pearson Intl

Mon 7/9

8:50 a.m.-12:02 p.m.

1 stop4h 12m

C$ 987

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Fri 16/10

8:55 a.m.-11:49 a.m.

Nonstop1h 54m

Toronto Pearson Intl

Sun 18/10

7:00 a.m.-12:15 p.m.

1 stop6h 15m

C$ 1,154

Flights are sorted by cheapest round-trip flights first.

Deals found on 19/7

Showing 1-10 of 20 resultsSorted by cheapest first
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

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

Currently, December is the cheapest month in which you can book a flight from St. Louis to Toronto (average of C$ 657). Flying from St. Louis to Toronto in January is currently the most expensive (average of C$ 1,184). 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 23 July 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from St. Louis to Toronto as you normally would.

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 23 July 2026.

The most flights from STL to YTO are scheduled on a Monday (4 on average). You will have fewer flight options on Thursday, 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?

Airfare is below average for this route at the moment.
St. Louis to Toronto flights typically cost between C$ 786 and C$ 1,142 in September.
The cheapest round-trip price found within the last 5 days was C$ 500 on American Airlines (5 Sep-12 Sep).

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

Booking 88 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.

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 3 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 8h 01m. American Airlines provides one of the quickest options available for as low as C$ 844. The distance between St. Louis and Toronto is about 1051 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • 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$ 334 on this airline. Users have found that Air Canada is 59% cheaper than the other options available to this destination.

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

    Consider Air Canada (69%), Jazz (67%) or United Airlines (47%) 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$ 360, our data shows the cheapest flight currently is C$ 195. When looking at the most popular route, (Lambert-St Louis - Toronto Pearson Intl), you can expect to pay C$ 579 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, December is the cheapest month in which you can book a flight from St. Louis to Toronto (average of C$ 657). Flying from St. Louis to Toronto in January is currently the most expensive (average of C$ 1,184). 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

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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 23 July 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 334AverageC$ 743FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from St. Louis to Toronto?

Deals for St. Louis to Toronto flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from St. Louis to Toronto?

Cheapflights simply makes it quick and affordable to book flights from St. Louis to Toronto by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from St. Louis to Toronto with no change fees?

Yes! Cheapflights helps users easily find flights from St. Louis to Toronto with no change fees.

Can Cheapflights notify me if prices for flights from St. Louis to Toronto become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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