Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from St. Louis to Toronto from C$ 193

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 25/9. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YTO
17 Jun — 24 Jun1
1 adult

Cheapflights Tip: The best prices from Lambert-St Louis to Toronto are usually found in January or April, booked 52 days in advance, depart on a Monday or Tuesday and return on a Thursday

Cheap 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 June 2025.

Round-trip from

C$ 413

One-way from

C$ 193

Popular in

March

Cheapest in

January

Average price

C$ 543

Good round-trip deal

C$ 574 or less
9/7-15/7
  • 9/7-15/7
  • 3 total stops
  • 36h 42m total
  • St. Louis to Toronto
Search Deals
American Airlines
  • American Airlines
  • 25/9
  • 1 total stop
  • 10h 54m total
  • St. Louis to Toronto
Search Deals
High demand for flights, 2% potential price rise
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 28 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2025
Search Deals
Price to beat on a round-trip flight from Lambert-St Louis to Toronto (YTO).
Search Deals

Find flight deals from St. Louis to Toronto

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 June 2025.

Wed 9/711:24 a.m.STL - YYZ
2 stops25h 41mMultiple Airlines
Tue 15/76:30 a.m.YYZ - STL
1 stop11h 01mMultiple Airlines
Deal found 10/6C$ 413
Mon 15/95:55 a.m.STL - YYZ
1 stop10h 54mAmerican Airlines
Wed 17/911:44 a.m.YYZ - STL
1 stop11h 09mAmerican Airlines
Deal found 11/6C$ 461
Sun 29/66:12 a.m.STL - YYZ
1 stop9h 38mSun Country Air
Thu 3/711:40 a.m.YYZ - STL
1 stop24h 50mSun Country Air
Deal found 9/6C$ 495
Sun 22/67:30 a.m.STL - YYZ
Nonstop1h 55mAir Canada
Thu 26/611:30 a.m.YYZ - STL
Nonstop2h 06mAir Canada
Deal found 10/6C$ 509
Fri 20/65:20 a.m.STL - YYZ
1 stop8h 51mUnited Airlines
Fri 20/65:15 p.m.YYZ - STL
1 stop6h 30mUnited Airlines
Deal found 10/6C$ 510
Fri 20/66:40 a.m.STL - YYZ
1 stop7h 01mDelta
Sat 21/63:31 p.m.YYZ - STL
1 stop5h 59mDelta
Deal found 10/6C$ 543

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 June 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

Wed 9/7

11:24 a.m.-2:05 p.m.

2 stops25h 41m

Toronto Pearson Intl

Tue 15/7

6:30 a.m.-4:31 p.m.

1 stop11h 01m

C$ 413

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Mon 15/9

5:55 a.m.-5:49 p.m.

1 stop10h 54m

Toronto Pearson Intl

Wed 17/9

11:44 a.m.-9:53 p.m.

1 stop11h 09m

C$ 461

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Sun 29/6

6:12 a.m.-4:50 p.m.

1 stop9h 38m

Toronto Pearson Intl

Thu 3/7

11:40 a.m.-11:30 a.m.

1 stop24h 50m

C$ 495

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Sun 22/6

7:30 a.m.-10:25 a.m.

Nonstop1h 55m

Toronto Pearson Intl

Thu 26/6

11:30 a.m.-12:36 p.m.

Nonstop2h 06m

C$ 509

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 25/9

12:25 p.m.-9:02 p.m.

1 stop7h 37m

Toronto Pearson Intl

Sun 28/9

2:10 p.m.-2:27 p.m.

1 stop25h 17m

C$ 539

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Fri 27/6

6:40 a.m.-2:41 p.m.

1 stop7h 01m

Toronto Pearson Intl

Tue 22/7

6:05 p.m.-8:36 p.m.

1 stop3h 31m

C$ 681

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 25/9

5:55 a.m.-5:49 p.m.

1 stop10h 54m

C$ 193

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 24/7

10:47 a.m.-9:23 p.m.

2 stops33h 36m

C$ 202

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Sun 6/7

6:36 a.m.-4:50 p.m.

1 stop9h 14m

C$ 209

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Sun 2/11

4:15 p.m.-7:10 p.m.

Nonstop1h 55m

C$ 280

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/6

Showing 1-10 of 11 results
1
2

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 9 June 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, January is the cheapest month in which you can book a flight from St. Louis to Toronto (average of C$ 167). Flying from St. Louis to Toronto in July is currently the most expensive (average of C$ 255). 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 June 2025.

One of the essential ways to save on airfare from St. Louis to Toronto is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 25% on airfare.

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 12 June 2025.

The most flights from STL to YTO are scheduled on a Wednesday (4 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (2 on average).

Rainfall in Toronto by month

Plan your trip to Toronto by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Toronto ranges from 51.0 - 83.0 mm per month. June is typically the wettest month, when rainfall can reach 83.0 mm. February is typically the driest time to visit Toronto when rainfall is around 51.0 mm.

Temperature in Toronto by month

Plan your trip to Toronto by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Toronto, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 21.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -6.0 C).

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 June 2025.
Get a feel of what it's like to fly with Delta, United Airlines and American Airlines from St. Louis to Toronto by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,950 reviews
Check prices

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,950 reviews
Delta
8.0
Very good
7,950 reviews
Check prices

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,790 reviews
Delta
8.0
Very good
7,950 reviews
Check prices

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,950 reviews
Check prices

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Air Canada
7.1
Good
9,531 reviews
Delta
8.0
Very good
7,950 reviews
Check prices

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Sun Country Air
6.9
Okay
345 reviews
Delta
8.0
Very good
7,950 reviews
Check prices

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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.

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

    Our cheapest airline available from St. Louis to Toronto is American Airlines. Our recent data shows that you can find tickets from as low as C$ 461 on this airline. Additional options worth looking into are Sun Country Air and Air Canada, starting at C$ 495 and C$ 509 round-trip. Users have found that American Airlines is 20% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from St. Louis to Toronto one-way?

    For one-way options, check prices for American Airlines. According to our data, you can fly for as low as C$ 193. Users have also found prices from C$ 209 and C$ 280 on Sun Country Air and Air Canada, respectively.

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

    Consider United Airlines (73%), Air Canada (50%) or Jazz (37%) 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$ 586, our data shows the cheapest flight currently is C$ 507. When looking at the most popular route, (Lambert-St Louis - Toronto Pearson Intl), you can expect to pay C$ 413 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, January is the cheapest month in which you can book a flight from St. Louis to Toronto (average of C$ 167). Flying from St. Louis to Toronto in July is currently the most expensive (average of C$ 255). 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

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

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 June 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 298AverageC$ 772FlexibilityNo 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!

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.