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Cheap flights from St. Louis to Toronto from C$ 177

STL — YTO
12 Oct — 19 Oct1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Lambert-St Louis to Toronto are usually found in December or March, booked 53 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

Cheap flight deals from St. Louis to Toronto

Enter your travel dates to find the best prices.

Cheapest flights from St. Louis to Toronto

Mon 9/114:26 p.m. -
1 stop20h 44m
Tue 17/1112:20 p.m. -
2 stops30h 20m
Deal found 9/9C$ 489
Mon 7/126:05 p.m. -
1 stop19h 05m
Fri 11/125:15 p.m. -
1 stop8h 26m
Deal found 10/9C$ 490
Thu 1/105:00 a.m. -
1 stop8h 32m
Tue 6/101:15 p.m. -
1 stop12h 04m
Deal found 10/9C$ 492
Thu 19/116:00 a.m. -
1 stop7h 33m
Thu 26/116:00 a.m. -
2 stops11h 34m
Deal found 8/9C$ 504
Fri 4/126:05 p.m. -
1 stop18h 35m
Mon 7/127:15 a.m. -
1 stop18h 26m
Deal found 8/9C$ 515
Sat 7/114:26 p.m. -
1 stop20h 14m
Thu 12/116:30 a.m. -
2 stops36h 10m
Deal found 7/9C$ 528
Fri 2/105:00 a.m. -
1 stop8h 32m
Wed 7/1011:40 a.m. -
1 stop10h 17m
Deal found 10/9C$ 529
Sat 10/1011:20 a.m. -
1 stop10h 55m
Thu 15/106:30 a.m. -
1 stop17h 51m
Deal found 8/9C$ 539
Thu 22/104:30 p.m. -
1 stop26h 35m
Thu 29/109:35 a.m. -
1 stop14h 41m
Deal found 7/9C$ 540
Wed 25/115:59 p.m. -
1 stop18h 41m
Mon 30/112:25 p.m. -
2 stops41h 44m
Deal found 8/9C$ 546
Fri 23/104:30 p.m. -
1 stop20h 15m
Sun 25/106:30 a.m. -
1 stop17h 43m
Deal found 9/9C$ 549
Mon 9/117:00 a.m. -
1 stop8h 34m
Tue 17/113:15 p.m. -
1 stop8h 00m
Deal found 9/9C$ 557

Find flight deals from St. Louis to Toronto

Round-trip from

C$ 489

One-way from

C$ 177

Popular in

August

Cheapest in

December

Average price

C$ 955
9/11-17/11
  • 9/11-17/11
  • 3 total stops
  • 51h 04m total
  • St. Louis to Toronto
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23/10-31/12
  • 23/10-31/12
  • 2 total stops
  • 44h 40m total
  • St. Louis to Toronto
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (C$ 149 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease (C$ 24 potential savings vs. average RT price).
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Average for round-trip flights in September 2026
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Cheapflights Fare Finder

 
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 Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Fri 16/10

5:00 a.m.-2:33 p.m.

1 stop8h 33m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 242

St. LouisToronto

STL Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Fri 16/10

6:35 p.m.-7:55 p.m.

3 stops24h 20m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 245

St. LouisToronto

STL Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Fri 23/10

6:35 p.m.-7:55 p.m.

3 stops24h 20m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 263

St. LouisToronto

STL Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Thu 15/10

7:03 a.m.-4:47 p.m.

1 stop8h 44m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 277

St. LouisToronto

STL Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Fri 27/11

6:53 a.m.-4:33 p.m.

1 stop8h 40m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 316

St. LouisToronto

STL Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Wed 16/9

2:29 p.m.-2:05 p.m.

2 stops22h 36m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 382
Quickest round-trip

St. LouisToronto

STL Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Wed 30/9

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

Nonstop1h 54m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 427

St. LouisToronto

STL Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Wed 30/9

12:17 p.m.-12:10 a.m.

3 stops34h 53m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 429

St. LouisToronto

STL Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Fri 16/10

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

Nonstop1h 54m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 432

St. LouisToronto

STL Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Fri 18/9

2:29 p.m.-11:35 a.m.

2 stops20h 06m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 441

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/9

Showing 1-10 of 21 resultsSorted by cheapest first
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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

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$ 664). Flying from St. Louis to Toronto in January is currently the most expensive (average of C$ 1,164). 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?

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

The most flights from STL to YTO are scheduled on a Monday (5 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (4 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$ 740 and C$ 1,016 in November.
The cheapest round-trip price found within the last 5 days was C$ 489 on Multiple Airlines (9 Nov-17 Nov).

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

Booking 87 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

  • 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 4 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 7h 33m. American Airlines provides one of the quickest options available for as low as C$ 504. 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$ 328 on this airline. Users have found that Air Canada is 61% cheaper than the other options available to this destination.

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

    Consider Air Canada (63%), Jazz (63%) or United Airlines (63%) 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, December is the cheapest month in which you can book a flight from St. Louis to Toronto (average of C$ 664). Flying from St. Louis to Toronto in January is currently the most expensive (average of C$ 1,164). 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

Top airline flying from St. Louis to Toronto

AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 328AverageC$ 730FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

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