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Cheap flights from St. Louis to Toronto from C$ 129

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 24/2. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YTO
26 Feb — 5 Mar1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Lambert-St Louis to Toronto are usually found in June or May, booked 46 days in advance, depart on a Friday or Wednesday and return on a Thursday

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 27 January 2026.

Mon 2/33:49 p.m.
STL
-
YYZ
1 stop7h 25m
Multiple Airlines
Tue 3/37:15 a.m.
YYZ
-
STL
1 stop16h 12m
Multiple Airlines
Deal found 26/1C$ 311
Sun 1/310:11 p.m.
STL
-
YYZ
1 stop31h 32m
Multiple Airlines
Thu 5/38:20 p.m.
YYZ
-
STL
1 stop11h 42m
Multiple Airlines
Deal found 26/1C$ 340
Sun 1/310:11 p.m.
STL
-
YYZ
2 stops20h 25m
Multiple Airlines
Tue 3/37:10 a.m.
YYZ
-
STL
1 stop16h 17m
Multiple Airlines
Deal found 26/1C$ 342
Wed 18/23:49 p.m.
STL
-
YYZ
1 stop7h 25m
Multiple Airlines
Fri 20/27:10 a.m.
YYZ
-
STL
1 stop18h 17m
Multiple Airlines
Deal found 27/1C$ 356
Sat 28/22:51 p.m.
STL
-
YYZ
2 stops38h 52m
Multiple Airlines
Wed 4/38:20 p.m.
YYZ
-
STL
1 stop28h 39m
Multiple Airlines
Deal found 27/1C$ 366
Tue 3/33:49 p.m.
STL
-
YYZ
1 stop7h 25m
Multiple Airlines
Tue 17/37:15 a.m.
YYZ
-
STL
2 stops28h 22m
Multiple Airlines
Deal found 26/1C$ 393
Fri 27/23:49 p.m.
STL
-
YYZ
2 stops26h 45m
Multiple Airlines
Tue 3/37:15 a.m.
YYZ
-
STL
1 stop16h 12m
Multiple Airlines
Deal found 27/1C$ 404
Tue 7/44:54 p.m.
STL
-
YYZ
1 stop30h 20m
Multiple Airlines
Tue 14/43:40 p.m.
YYZ
-
STL
2 stops16h 10m
Multiple Airlines
Deal found 27/1C$ 409
Fri 27/23:49 p.m.
STL
-
YYZ
2 stops26h 45m
Multiple Airlines
Wed 4/37:15 a.m.
YYZ
-
STL
1 stop16h 12m
Multiple Airlines
Deal found 27/1C$ 446

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 27 January 2026.

Round-trip from

C$ 311

One-way from

C$ 129

Popular in

November

Cheapest in

June

Average price

C$ 728
2/3-3/3
  • 2/3-3/3
  • 2 total stops
  • 23h 37m total
  • St. Louis to Toronto
Search Deals
24/2
  • 24/2
  • 1 total stop
  • 7h 25m total
  • St. Louis to Toronto
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (C$ 109 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 31 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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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 27 January 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

Sun 1/3

10:11 p.m.-9:11 p.m.

2 stops22h 00m

Toronto Pearson Intl

Thu 5/3

8:20 p.m.-7:02 a.m.

1 stop11h 42m

C$ 345

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Mon 13/4

8:41 a.m.-12:14 a.m.

1 stop14h 33m

Toronto Pearson Intl

Tue 14/4

3:40 p.m.-6:50 a.m.

2 stops16h 10m

C$ 456

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Mon 23/2

8:22 p.m.-7:05 p.m.

2 stops21h 43m

Toronto Pearson Intl

Thu 26/2

7:10 a.m.-11:59 p.m.

1 stop17h 49m

C$ 493

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 26/2

3:49 p.m.-12:14 a.m.

1 stop7h 25m

Toronto Pearson Intl

Wed 4/3

7:15 a.m.-10:27 p.m.

1 stop16h 12m

C$ 531

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Sat 7/3

8:00 a.m.-9:29 p.m.

1 stop12h 29m

Toronto Pearson Intl

Tue 17/3

11:40 a.m.-9:11 p.m.

1 stop10h 31m

C$ 533

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 19/2

8:00 a.m.-5:36 p.m.

1 stop8h 36m

Toronto Pearson Intl

Thu 26/2

6:00 a.m.-3:42 p.m.

1 stop10h 42m

C$ 533

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Sun 12/4

11:21 a.m.-2:53 p.m.

2 stops26h 32m

Toronto Pearson Intl

Thu 16/4

7:15 a.m.-11:19 p.m.

1 stop17h 04m

C$ 587

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Sat 28/2

3:49 p.m.-12:14 a.m.

1 stop7h 25m

Toronto Pearson Intl

Mon 2/3

7:15 a.m.-11:59 p.m.

1 stop17h 44m

C$ 609

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Fri 20/2

5:50 p.m.-10:40 p.m.

1 stop3h 50m

Toronto Pearson Intl

Mon 23/2

3:40 p.m.-6:51 a.m.

2 stops40h 11m

C$ 616

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Wed 15/4

7:45 a.m.-7:37 p.m.

1 stop10h 52m

Toronto Pearson Intl

Sun 19/4

9:00 p.m.-9:08 p.m.

1 stop25h 08m

C$ 634

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/1

Showing 1-10 of 20 results
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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 23 January 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 C$ 244). Flying from St. Louis to Toronto in January is currently the most expensive (average of C$ 1,069). 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 27 January 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.

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

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 1 outbound flight 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 12h 29m. American Airlines provides one of the quickest options available for as low as C$ 533. 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$ 298 on this airline. Users have found that Air Canada is 57% cheaper than the other options available to this destination.

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

    Consider Air Canada (72%), Jazz (72%) or United Airlines (72%) when booking your flight. These represent the most reliable airlines when flying from St. Louis to Toronto.

  • 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 C$ 244). Flying from St. Louis to Toronto in January is currently the most expensive (average of C$ 1,069). 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 27 January 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 298AverageC$ 638FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

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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?

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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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