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$118+ Cheap flights from St. Louis (STL) to Ontario

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 1/13. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YYZ
nov. 26 — dic. 31
mar. 11/26
mar. 12/3
1 adult, Economy
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Cheap flight deals from St. Louis to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Ontario (CAON). 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 noviembre 21, 2024.

Find flight deals from St. Louis to Ontario

Cheapest flights from St. Louis to Ontario
Explore the most affordable flight options available from St. Louis to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on noviembre 21, 2024.

This Kiwi.com deal was found by Cheapflights users on 11/20. 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.
mié. 12/115:02 pmSTL - YYZ
1 stop15h 52mMultiple Airlines
lun. 12/168:00 pmYYZ - STL
2 stops20h 21mMultiple Airlines
Deal found 11/20$287
This Kiwi.com deal was found by Cheapflights users on 11/20. 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.
mar. 12/104:26 pmSTL - YUL
1 stop21h 29mMultiple Airlines
lun. 1/133:55 pmYUL - STL
1 stop23h 48mMultiple Airlines
Deal found 11/20$358
This Kiwi.com deal was found by Cheapflights users on 11/20. 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.
mié. 12/1811:45 amSTL - YOW
1 stop7h 24mMultiple Airlines
mar. 12/319:20 amYOW - STL
1 stop15h 08mMultiple Airlines
Deal found 11/20$400
This WestJet deal was found by Cheapflights users on 11/20. 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 WestJet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/97:15 pmSTL - YYZ
2 stops26h 58mWestJet
mié. 12/116:15 amYYZ - STL
1 stop28h 07mWestJet
Deal found 11/20$437
This American Airlines deal was found by Cheapflights users on 11/20. 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.
mié. 12/185:45 amSTL - YYZ
1 stop10h 50mAmerican Airlines
mié. 12/256:15 amYYZ - STL
1 stop10h 25mAmerican Airlines
Deal found 11/20$524
This United Airlines deal was found by Cheapflights users on 11/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/1811:20 amSTL - YYZ
1 stop9h 05mUnited Airlines
mié. 12/258:00 amYYZ - STL
1 stop12h 57mUnited Airlines
Deal found 11/20$534
This Justfly.com deal was found by Cheapflights users on 11/20. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/1910:35 amSTL - YYZ
1 stop4h 10mAir Canada
mar. 12/241:50 pmYYZ - STL
Nonstop2h 16mAir Canada
Deal found 11/20$557
This American Airlines deal was found by Cheapflights users on 11/20. 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.
lun. 12/1611:00 amSTL - YUL
2 stops10h 57mAmerican Airlines
lun. 1/1310:54 amYUL - STL
1 stop10h 15mAmerican Airlines
Deal found 11/20$590
This Delta deal was found by Cheapflights users on 11/19. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 12/75:30 pmSTL - YYZ
1 stop4h 06mDelta
mié. 12/116:30 amYYZ - STL
1 stop9h 30mDelta
Deal found 11/19$604
This Delta deal was found by Cheapflights users on 11/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/1610:28 amSTL - YUL
1 stop5h 31mDelta
dom. 1/1211:20 amYUL - STL
1 stop10h 46mDelta
Deal found 11/20$657
This United Airlines deal was found by Cheapflights users on 11/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/105:28 pmSTL - YUL
2 stops22h 32mUnited Airlines
lun. 1/138:00 pmYUL - STL
2 stops15h 24mUnited Airlines
Deal found 11/20$685
This Air Canada deal was found by Cheapflights users on 11/20. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/258:00 amSTL - YUL
1 stop5h 47mAir Canada
dom. 1/59:15 amYUL - STL
1 stop6h 51mAir Canada
Deal found 11/20$749

Find flights from St. Louis to Ontario within your budget

Customize your flight search to find flights from St. Louis to Ontario 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 2,629,791 searches. Data last updated noviembre 21, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

mié. 12/11

5:02 pm-9:54 am

1 stop15h 52m

Toronto Pearson Intl

lun. 12/16

8:00 pm-3:21 pm

2 stops20h 21m

$287

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

mar. 12/10

4:26 pm-2:55 pm

1 stop21h 29m

Montreal Pierre Elliott Trudeau Intl

lun. 1/13

3:55 pm-2:43 pm

1 stop23h 48m

$358

St. LouisOttawa

STL - YOW

STLYOW

Lambert-St Louis

mié. 12/18

11:45 am-8:09 pm

1 stop7h 24m

Ottawa

mar. 12/31

9:20 am-11:28 pm

1 stop15h 08m

$400

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

lun. 12/9

7:15 pm-11:13 pm

2 stops26h 58m

Toronto Pearson Intl

mié. 12/11

6:15 am-9:22 am

1 stop28h 07m

$437

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

jue. 1/23

2:49 pm-3:05 pm

1 stop23h 16m

Toronto Pearson Intl

lun. 1/27

4:20 pm-1:53 pm

1 stop22h 33m

$498

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

mié. 12/18

5:45 am-5:35 pm

1 stop10h 50m

Toronto Pearson Intl

mié. 12/25

6:15 am-3:40 pm

1 stop10h 25m

$524

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

mié. 1/8

1:35 pm-11:42 pm

1 stop9h 07m

Toronto Pearson Intl

mié. 1/22

7:55 am-4:53 pm

1 stop9h 58m

$525

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

mié. 12/18

11:20 am-9:25 pm

1 stop9h 05m

Toronto Pearson Intl

mié. 12/25

8:00 am-7:57 pm

1 stop12h 57m

$534

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

jue. 12/19

10:35 am-3:45 pm

1 stop4h 10m

Toronto Pearson Intl

mar. 12/24

1:50 pm-3:06 pm

Nonstop2h 16m

$557

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

lun. 12/16

11:00 am-10:57 pm

2 stops10h 57m

Montreal Pierre Elliott Trudeau Intl

lun. 1/13

10:54 am-8:09 pm

1 stop10h 15m

$590

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/20

Showing 1-10 of 26 results
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Best time to book a flight from St. Louis to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario 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.

Travel insights for flights from St. Louis to Ontario

Get recent, data-driven insights about flights from St. Louis to Ontario including ideal travel times, pricing trends, and more.

What is the cheapest month to book a flight from St. Louis to Region of Ontario?

Currently, January is the cheapest month in which you can book a flight from St. Louis to Region of Ontario (average of $242). Flying from St. Louis to Region of Ontario in July is currently the most expensive (average of $359). 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 ON?

Find hourly flight availability from St. Louis to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated noviembre 21, 2024.

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

Weekly flight availability from St. Louis to Region of Ontario

Explore weekly flight availability from St. Louis to Ontario. 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 noviembre 21, 2024.

The most flights from STL to CAON are scheduled on a Wednesday (2 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (1 on average).

Rainfall in Ontario by month

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

In terms of precipitation, rainfall in Region of Ontario ranges from 2.0 - 3.3 inches per month. June is typically the wettest month, when rainfall can reach 3.3 in. February is typically the driest time to visit Region of Ontario when rainfall is around 2.0 in.

Temperature in Ontario by month

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

If weather is an important factor for your trip to Region of Ontario, 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 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 21.2 F).

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated noviembre 21, 2024.
Peruse reviews from past customers who have flown with WestJet, Alaska Airlines and American Airlines from St. Louis to Ontario to help guide your decision. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,458 reviews

Comfort

7.9

Food

7.2

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 10

Service was good. We pre-ordered a snack but never made it to us.

Alaska Airlines
8.0
Very good
9,458 reviews
Alaska Airlines
8.0
Very good
9,458 reviews

Comfort

7.9

Food

7.2

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 10

Service was good. We pre-ordered a snack but never made it to us.

Delta
8.0
Very good
8,759 reviews
Alaska Airlines
8.0
Very good
9,458 reviews

Comfort

7.9

Food

7.2

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 10

Service was good. We pre-ordered a snack but never made it to us.

United Airlines
7.4
Good
9,173 reviews
Alaska Airlines
8.0
Very good
9,458 reviews

Comfort

7.9

Food

7.2

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 10

Service was good. We pre-ordered a snack but never made it to us.

WestJet
7.3
Good
2,810 reviews
Alaska Airlines
8.0
Very good
9,458 reviews

Comfort

7.9

Food

7.2

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 10

Service was good. We pre-ordered a snack but never made it to us.

American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
9,458 reviews

Comfort

7.9

Food

7.2

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 10

Service was good. We pre-ordered a snack but never made it to us.

Related info for your journey

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

    Lambert-St Louis (STL) is the airport you will fly out of if you book a flight from St. Louis to Ontario. It is only a 12.7 mi journey to Lambert-St Louis (STL) from St. Louis’s city center.

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

    One-way options have recently been found by users for as low as $279 on American Airlines. Other airlines that offer cheap prices include United Airlines from $295 and Air Canada from $323 one-way.

  • What are the most popular routes from St. Louis to Region of Ontario?

    When deciding which route to take from St. Louis to Region of Ontario consider Lambert-St Louis - Toronto Pearson Intl, Lambert-St Louis - Montreal Pierre Elliott Trudeau Intl or Lambert-St Louis - Ottawa as they are the most popular.

  • What are the most reliable airlines from St. Louis to Region of Ontario?

    No one likes to see their flight delayed. When booking a flight from St. Louis to Region of Ontario consider choosing Air Canada (90%), Jazz (90%) or United Airlines (90%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from St. Louis to Region of Ontario?

    Looking for the cheapest flight from St. Louis to Region of Ontario? While on average our users pay $1,117, our data indicates the cheapest price to be $179. The most popular route (Lambert-St Louis - Toronto Pearson Intl), is priced around $287.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from St. Louis to Ontario 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 Region of Ontario?

    Currently, January is the cheapest month in which you can book a flight from St. Louis to Region of Ontario (average of $242). Flying from St. Louis to Region of Ontario in July is currently the most expensive (average of $359). 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.

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Alternative routes for St. Louis to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
Kansas City to Vancouver Intl flights
St. Louis to Pearson Intl flights
St. Louis to Vancouver Intl flights
Kansas City to Pearson Intl flights
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St. Louis to Pierre Elliott Trudeau Intl flights
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St. Louis to Edmonton flights
Kansas City to Calgary flights
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St. Louis to Ottawa flights
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Kansas City to Halifax flights
Springfield to Pierre Elliott Trudeau Intl flights
Columbia to Pearson Intl flights
Kansas City to Winnipeg flights
Joplin to Pearson Intl flights
Springfield to Vancouver Intl flights
St. Louis to St. John's flights
Kansas City to Ottawa flights
St. Louis to Winnipeg flights
St. Louis to Grande Prairie flights
Springfield to Pearson Intl flights
Kansas City to Saskatoon flights
St. Louis to Kelowna flights
Kansas City to Moncton flights
Columbia to Pierre Elliott Trudeau Intl flights
St. Louis to Saskatoon flights
Springfield to Calgary flights
St. Louis to Sydney flights
Springfield to Toronto Island flights
Kansas City to St. John's flights
Joplin to Pierre Elliott Trudeau Intl flights
St. Louis to Victoria flights

Top 3 airlines flying from St. Louis to Ontario

Discover the top 3 airlines that operate flights from St. Louis to Ontario. 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 2,629,791 searches. Data last updated noviembre 21, 2024.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$197Average$578FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$225Average$533FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$304Average$552FlexibilityNo cancel feeOn-time71%
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