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Cheap flights from St. Louis to Toronto from C$ 149

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 25/1. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YTO
11 ene. — 18 ene.1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from Lambert-St Louis to Toronto are usually found in April or June, booked 52 days in advance, depart on a Wednesday or Thursday 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 12 diciembre 2025.

jue. 25/126:00 a.m.STL - YYZ
1 stop3h 56mAmerican Airlines
mar. 30/121:12 p.m.YYZ - STL
1 stop11h 32mAmerican Airlines
Deal found 11/12C$ 681
jue. 25/128:05 a.m.STL - YYZ
2 stops9h 52mUnited Airlines
mar. 30/125:30 p.m.YYZ - STL
1 stop5h 13mUnited Airlines
Deal found 10/12C$ 694
mar. 30/126:35 p.m.STL - YYZ
1 stop4h 24mAir Canada
vie. 2/16:45 p.m.YYZ - STL
1 stop4h 58mAir Canada
Deal found 11/12C$ 785
jue. 25/123:10 p.m.STL - YYZ
2 stops7h 36mAir Canada
mar. 30/124:50 p.m.YYZ - STL
1 stop5h 53mAir Canada
Deal found 11/12C$ 798
vie. 19/128:37 p.m.STL - YYZ
1 stop14h 06mMultiple Airlines
dom. 4/18:20 p.m.YYZ - STL
1 stop14h 25mMultiple Airlines
Deal found 9/12C$ 811
mar. 30/126:35 p.m.STL - YYZ
1 stop4h 24mUnited Airlines
jue. 1/19:00 a.m.YYZ - STL
2 stops14h 22mUnited Airlines
Deal found 10/12C$ 844
dom. 14/123:30 p.m.STL - YYZ
1 stop19h 13mMultiple Airlines
mar. 16/128:30 p.m.YYZ - STL
2 stops38h 10mMultiple Airlines
Deal found 10/12C$ 885
mar. 23/1211:51 a.m.STL - YYZ
1 stop22h 52mMultiple Airlines
jue. 25/127:40 a.m.YYZ - STL
2 stops15h 53mMultiple Airlines
Deal found 10/12C$ 907
mar. 23/126:35 p.m.STL - YYZ
1 stop4h 24mUnited Airlines
jue. 25/126:40 p.m.YYZ - STL
1 stop6h 03mUnited Airlines
Deal found 10/12C$ 910
lun. 15/1210:47 a.m.STL - YYZ
2 stops12h 38mMultiple Airlines
sáb. 3/17:10 a.m.YYZ - STL
1 stop16h 23mMultiple Airlines
Deal found 10/12C$ 938

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 12 diciembre 2025.

Round-trip from

C$ 356

One-way from

C$ 149

Popular in

November

Cheapest in

April

Average price

C$ 679
8/1-15/1
  • 8/1-15/1
  • 3 total stops
  • 35h 24m total
  • St. Louis to Toronto
Search Deals
25/1
  • 25/1
  • 2 total stops
  • 25h 29m total
  • St. Louis to Toronto
Search Deals
Highest demand for flights based on searches. 14% potential increase in price (C$ 159 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 35 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 12 diciembre 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

dom. 25/1

5:42 p.m.-8:11 p.m.

2 stops25h 29m

Toronto Pearson Intl

dom. 1/2

8:00 p.m.-8:50 p.m.

1 stop25h 50m

C$ 385

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

sáb. 14/2

6:35 p.m.-10:56 a.m.

1 stop15h 21m

Toronto Pearson Intl

sáb. 21/2

6:00 a.m.-2:45 p.m.

1 stop9h 45m

C$ 484

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

vie. 27/3

9:50 a.m.-9:09 p.m.

2 stops10h 19m

Toronto Pearson Intl

lun. 30/3

7:10 a.m.-11:19 p.m.

1 stop17h 09m

C$ 579

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

lun. 16/3

4:05 p.m.-7:06 p.m.

Nonstop2h 01m

Toronto Pearson Intl

vie. 20/3

2:00 p.m.-3:29 p.m.

Nonstop2h 29m

C$ 647

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

vie. 6/3

4:05 p.m.-7:06 p.m.

Nonstop2h 01m

Toronto Pearson Intl

dom. 8/3

2:00 p.m.-3:29 p.m.

Nonstop2h 29m

C$ 647

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

vie. 27/3

4:05 p.m.-7:06 p.m.

Nonstop2h 01m

Toronto Pearson Intl

dom. 29/3

2:10 p.m.-3:24 p.m.

Nonstop2h 14m

C$ 647

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

dom. 25/1

4:05 p.m.-7:06 p.m.

Nonstop2h 01m

Toronto Pearson Intl

dom. 1/2

2:00 p.m.-3:29 p.m.

Nonstop2h 29m

C$ 647

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

jue. 8/1

4:05 p.m.-7:06 p.m.

Nonstop2h 01m

Toronto Pearson Intl

jue. 15/1

2:00 p.m.-3:29 p.m.

Nonstop2h 29m

C$ 647

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

sáb. 14/2

4:05 p.m.-7:06 p.m.

Nonstop2h 01m

Toronto Pearson Intl

sáb. 21/2

2:00 p.m.-3:29 p.m.

Nonstop2h 29m

C$ 647

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

dom. 25/1

5:42 p.m.-8:11 p.m.

2 stops25h 29m

C$ 149

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/12

Showing 1-10 of 15 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 5 December 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, June is the cheapest month in which you can book a flight from St. Louis to Toronto (average of C$ 247). Flying from St. Louis to Toronto in October is currently the most expensive (average of C$ 712). 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 12 diciembre 2025.

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.

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 12 diciembre 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
10,516 reviews
Check prices

Crew

7.8

Food

6.3

Comfort

7.1

Entertainment

6.8

Boarding

7.3

Overall

7.1

Reviews

1 / 20
2.0
Mediocre

Shawna,Sep 2025

DCA - YYZ

Business class cabin was *freezing*. Landing was so hard it injured my back - no apology or explanation given
Air Canada
7.1
Good
10,516 reviews
Air Canada
7.1
Good
10,516 reviews
Check prices

Crew

7.8

Food

6.3

Comfort

7.1

Entertainment

6.8

Boarding

7.3

Overall

7.1

Reviews

1 / 20
2.0
Mediocre

Shawna,Sep 2025

DCA - YYZ

Business class cabin was *freezing*. Landing was so hard it injured my back - no apology or explanation given

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 15h 21m. American Airlines provides one of the quickest options available for as low as C$ 484. 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$ 294 on this airline. Users have found that Air Canada is 55% cheaper than the other options available to this destination.

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

    Consider Air Canada (94%), Jazz (94%) or United Airlines (94%) 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$ 247). Flying from St. Louis to Toronto in October is currently the most expensive (average of C$ 712). 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 12 diciembre 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 301AverageC$ 643FlexibilityNo 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.

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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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