HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Pearson Intl

$117+ Cheap flights from St. Louis (STL) to Pearson Intl (YYZ)

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 2/12. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YYZ
Jan 30 — Feb 61
Fri 1/30
Fri 2/6
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from St. Louis to Pearson Intl with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Lambert-St Louis to Toronto Pearson Intl are usually found in May or July, booked 12 days in advance, depart on a Tuesday or Sunday and return on a Saturday

Cheap flight deals from St. Louis to Pearson Intl

Best flights from St. Louis to Pearson Intl
Discover carefully curated flight deals from St. Louis to Pearson Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 31, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/99:45 pmSTL - YYZ
2 stops20h 51mMultiple Airlines
Wed 2/257:15 amYYZ - STL
1 stop16h 12mMultiple Airlines
Deal found 12/31$263
This American Airlines deal was found by Cheapflights users on 12/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/26:00 amSTL - YYZ
1 stop9h 03mAmerican Airlines
Sun 2/87:04 pmYYZ - STL
1 stop16h 16mAmerican Airlines
Deal found 12/30$366
This Kiwi.com deal was found by Cheapflights users on 12/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/29:45 pmSTL - YYZ
2 stops20h 51mMultiple Airlines
Sun 2/88:00 pmYYZ - STL
1 stop25h 50mMultiple Airlines
Deal found 12/30$266
This Kiwi.com deal was found by Cheapflights users on 12/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/1310:11 pmSTL - YYZ
1 stop31h 09mMultiple Airlines
Fri 2/208:20 pmYYZ - STL
1 stop13h 36mMultiple Airlines
Deal found 12/29$267
This Kiwi.com deal was found by Cheapflights users on 12/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/121:07 pmSTL - YYZ
1 stop16h 40mMultiple Airlines
Sat 1/173:40 pmYYZ - STL
2 stops40h 11mMultiple Airlines
Deal found 12/29$301
This American Airlines deal was found by Cheapflights users on 12/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/1410:43 amSTL - YYZ
1 stop9h 46mAmerican Airlines
Sat 2/211:10 pmYYZ - STL
1 stop9h 02mAmerican Airlines
Deal found 12/30$366
This American Airlines deal was found by Cheapflights users on 12/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/146:36 pmSTL - YYZ
1 stop15h 22mAmerican Airlines
Thu 2/196:00 amYYZ - STL
1 stop8h 43mAmerican Airlines
Deal found 12/30$366
This Kiwi.com deal was found by Cheapflights users on 12/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/135:11 pmSTL - YYZ
2 stops26h 00mMultiple Airlines
Sat 1/177:10 amYYZ - STL
1 stop16h 24mMultiple Airlines
Deal found 12/29$322
This Kiwi.com deal was found by Cheapflights users on 12/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/91:40 pmSTL - YYZ
2 stops16h 03mMultiple Airlines
Mon 2/168:20 pmYYZ - STL
1 stop27h 07mMultiple Airlines
Deal found 12/30$363
This Kiwi.com deal was found by Cheapflights users on 12/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/89:32 pmSTL - YYZ
2 stops22h 39mMultiple Airlines
Sat 2/144:45 pmYYZ - STL
1 stop22h 38mMultiple Airlines
Deal found 12/30$364

Find flight deals from St. Louis to Pearson Intl

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Pearson Intl (YYZ). 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 December 31, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$258
(Kiwi.com)

One-way from

$117
(Kiwi.com)

Popular in

October

Cheapest in

May

Average price

$467

Good round-trip deal

$675 or less

Good one-way deal

$296 or less
Provider with most accurate pricing for Lambert-St Louis-Toronto Pearson Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Toronto Pearson Intl flights.
Search Deals
From Lambert-St Louis to Toronto Pearson Intl
Search Deals
One-way flight from Lambert-St Louis to Toronto Pearson Intl
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($40 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Lambert-St Louis to Toronto Pearson Intl.
Search Deals
Price to beat on a one-way flight from Lambert-St Louis to Toronto Pearson Intl.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Pearson Intl 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 2,558,603 searches. Data last updated December 31, 2025.
Use the filters below to find and compare flights from St. Louis to Toronto Pearson Intl Airport that are best for you.

Fly from

St. Louis

Fly to

Pearson Intl

Route

Depart

Return

Price

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Mon 2/9

9:45 pm-7:36 pm

2 stops20h 51m

Toronto Pearson Intl

Wed 2/25

7:15 am-10:27 pm

1 stop16h 12m

$263

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Mon 2/2

9:45 pm-7:36 pm

2 stops20h 51m

Toronto Pearson Intl

Sun 2/8

8:00 pm-8:50 pm

1 stop25h 50m

$266

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Fri 2/13

10:11 pm-6:20 am

1 stop31h 09m

Toronto Pearson Intl

Fri 2/20

8:20 pm-8:56 am

1 stop13h 36m

$267

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Mon 1/12

1:07 pm-6:47 am

1 stop16h 40m

Toronto Pearson Intl

Sat 1/17

3:40 pm-6:51 am

2 stops40h 11m

$301

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 1/13

5:11 pm-8:11 pm

2 stops26h 00m

Toronto Pearson Intl

Sat 1/17

7:10 am-10:34 pm

1 stop16h 24m

$322

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Mon 2/9

1:40 pm-6:43 am

2 stops16h 03m

Toronto Pearson Intl

Mon 2/16

8:20 pm-10:27 pm

1 stop27h 07m

$363

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Sun 2/8

9:32 pm-9:11 pm

2 stops22h 39m

Toronto Pearson Intl

Sat 2/14

4:45 pm-2:23 pm

1 stop22h 38m

$364

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Mon 2/2

6:00 am-4:03 pm

1 stop9h 03m

Toronto Pearson Intl

Sun 2/8

7:04 pm-10:20 am

1 stop16h 16m

$366

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Sat 2/14

10:43 am-9:29 pm

1 stop9h 46m

Toronto Pearson Intl

Sat 2/21

1:10 pm-9:12 pm

1 stop9h 02m

$366

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Sat 2/14

6:36 pm-10:58 am

1 stop15h 22m

Toronto Pearson Intl

Thu 2/19

6:00 am-1:43 pm

1 stop8h 43m

$366

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/29

Showing 1-10 of 22 results
1
2
3

Compare providers for flights from St. Louis to Pearson Intl

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Pearson Intl in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on St. Louis-Toronto Pearson Intl Airport flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on St. Louis-Toronto Pearson Intl Airport flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from St. Louis-Toronto Pearson Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-Toronto Pearson Intl Airport flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Toronto Pearson Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from St. Louis to Pearson Intl

Have a flexible travel schedule? Discover the best time to fly to Pearson Intl 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 Pearson Intl Airport

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

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Pearson Intl. Price data was last updated on December 26, 2025.

Booking 12 days in advance of your planned departure date is, on average, the best time to get cheap flights from St. Louis to Toronto Pearson Intl Airport. 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 Pearson Intl Airport?

Currently, June is the cheapest month in which you can book a flight from St. Louis to Toronto Pearson Intl Airport (average of $179). Flying from St. Louis to Toronto Pearson Intl Airport in October is currently the most expensive (average of $516). 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 YYZ?

Find hourly flight availability from St. Louis to Pearson Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 31, 2025.

When flying from St. Louis to Toronto Pearson Intl Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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

The best insider tips for St. Louis to Toronto Pearson Intl Airport flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your St. Louis to Toronto Pearson Intl Airport trip
Airports
STL

Expect security screening at STL to take 5-10 minutes off-peak, but up to 15 minutes during peak times. Check wait times online before heading to the airport.

Read more about STLBy Taryn White
YYZ

For a quick customs experience at YYZ, expect some walking from your gate to customs. Assistance is available for those with mobility concerns.

Read more about YYZBy Kaitlyn McInnis
Our travel experts
Taryn White

Taryn White

Expert on STL

Taryn White

Taryn White

Taryn White is a freelance travel writer, digital creator, and travel advisor who has visited nearly 100 countries and all 50 states. She’s familiar with many airports and enjoys beach hopping, boutique hotels, spa experiences, and exploring local culture. Her work has appeared in Travel + Leisure, Condé Nast Traveler, National Geographic, Smithsonian Magazine, AFAR, and more.

Read more
Kaitlyn McInnis

Kaitlyn McInnis

Expert on YYZ

Kaitlyn McInnis

Kaitlyn McInnis

Kaitlyn is a guidebook author and travel writer splitting her time between Atlantic Canada and Istanbul, Türkiye. She has visited over fifty countries and all seven continents, so she is very familiar with many hotels, airports and airlines around the globe. But her favorite type of vacation is sunbathing by the sea with a good book in hand.

Read more

Reviews of airlines servicing Pearson Intl

Get insights into the airlines that provide service to Pearson Intl. 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 Pearson Intl. Reviews last updated December 31, 2025.
Read reviews from past customers who have flown United Airlines, American Airlines, and Air Canada from St. Louis to Toronto Pearson Intl Airport. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,122 reviews

Food

6.6

Overall

7.4

Entertainment

7.1

Comfort

7.3

Boarding

7.7

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.
United Airlines
7.4
Good
9,122 reviews
United Airlines
7.4
Good
9,122 reviews

Food

6.6

Overall

7.4

Entertainment

7.1

Comfort

7.3

Boarding

7.7

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.
American Airlines
7.2
Good
11,069 reviews
United Airlines
7.4
Good
9,122 reviews

Food

6.6

Overall

7.4

Entertainment

7.1

Comfort

7.3

Boarding

7.7

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.
Air Canada
7.1
Good
10,571 reviews
United Airlines
7.4
Good
9,122 reviews

Food

6.6

Overall

7.4

Entertainment

7.1

Comfort

7.3

Boarding

7.7

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Pearson Intl. 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 Pearson Intl?

    If you book a flight to Toronto Pearson Intl from St. Louis, you will be flying from Lambert-St Louis, which is the city’s only airport. Lambert-St Louis (STL) is located 12.7 mi from the center of St. Louis. There are 2 flights from Lambert-St Louis to Toronto Pearson Intl per day from 3 different airlines.

  • What are the cheapest airlines flying from St. Louis to Toronto Pearson Intl Airport round-trip?

    Flying on United Airlines is currently your cheapest option to Toronto Pearson Intl Airport, with prices starting at $199. Additional round-trip tickets that might be worth considering are offered by Air Canada and American Airlines, with the lowest prices starting at $214 and $270, respectively. United Airlines is priced at 60% lower than the current average price of a flight leaving 3 months from now.

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

    Before booking your flight to Toronto Pearson Intl Airport from St. Louis, check out the most reliable airlines to get you to your destination on time: Air Canada (93%), Jazz (93%), United Airlines( 93%).

  • What are the cheapest flights from St. Louis to Toronto Pearson Intl Airport?

    The cheapest flight price from St. Louis to Toronto Pearson Intl Airport is $209. On average you can expect to pay $1,388. The most popular route, (Lambert-St Louis - Toronto Pearson Intl), can usually be booked for $258.

  • Can I find deals for flights from St. Louis to Pearson Intl that include hotel bookings?

    Yes. In addition to deals on St. Louis to Pearson Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Pearson Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Pearson Intl.

  • Can I find deals for business class flights from St. Louis to Pearson Intl?

    Yes. Cheapflights offers flight deals from St. Louis to Pearson Intl 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 Pearson Intl Airport?

    Currently, June is the cheapest month in which you can book a flight from St. Louis to Toronto Pearson Intl Airport (average of $179). Flying from St. Louis to Toronto Pearson Intl Airport in October is currently the most expensive (average of $516). 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

Traveling to a place near Toronto Pearson Intl Airport?

Book flights to Toronto Pearson Intl Airport if you plan to visit one of these locations
Brampton
Kitchener
Markham
Collingwood
Oakville
Brantford
Pickering
Lindsay
Peterborough
Barrie
Cambridge
Milton
Oshawa
Burlington
Owen Sound
Ajax
Orillia
Vaughan
Richmond Hill
Gravenhurst

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 3 airlines flying from St. Louis to Pearson Intl

Discover the top 3 airlines that operate flights from St. Louis to Pearson Intl. 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 2,558,603 searches. Data last updated December 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$199Average$489FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$221Average$535FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$270Average$545FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
Site
©2025 Cheapflights