Cheap flights from St. Louis (STL) to Ontario from $123

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 9/23. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
STL — YYZ
Jun 11 — Jun 181

How far in advance should I book a flight from St. Louis to Region of Ontario?

To save on the cost of your flight from St. Louis to Region of Ontario, book at least 24 days before your planned departure. Booking around this time can save you about 128% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $259 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $473.

What is the cheapest month to fly from St. Louis to Region of Ontario?

March is one of the best times of the year to fly to Region of Ontario from St. Louis. Prices for March average $360 per person but you can even find prices for as low as $176. The most expensive prices can be found in the month of February. Opting for a March flight can save you 82% on your journey compared to booking in February

What is the cheapest time of day to fly from STL to ON?

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.

Cheap St. Louis to Ontario flights in June & July 2024

Find cheap flight options from St. Louis to Ontario specifically for the months of June and July 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 3,050,429 searches. Prices were last updated on June 6, 2024.
These are some of the most attractive deals on flights from St. Louis to Ontario in 2024. Check back regularly for other flight deals.
Wed 6/191:55 pmSTL - YYZ
1 stop15h 48mMultiple Airlines
Tue 6/256:30 amYYZ - STL
1 stop8h 53mMultiple Airlines
Deal found 6/4$263
Tue 6/187:29 pmSTL - YYZ
1 stop10h 16mMultiple Airlines
Sat 7/68:00 amYYZ - STL
1 stop10h 28mMultiple Airlines
Deal found 6/4$286
Thu 6/137:45 amSTL - YYZ
2 stops12h 15mMultiple Airlines
Tue 6/188:00 pmYYZ - STL
1 stop15h 42mMultiple Airlines
Deal found 6/5$295
Wed 6/191:55 pmSTL - YYZ
1 stop15h 48mMultiple Airlines
Sat 7/138:00 amYYZ - STL
1 stop10h 29mMultiple Airlines
Deal found 6/4$298
Tue 6/2511:57 amSTL - YYZ
1 stop10h 29mMultiple Airlines
Sat 7/138:00 amYYZ - STL
1 stop10h 29mMultiple Airlines
Deal found 6/4$302
Tue 6/1111:57 amSTL - YYZ
1 stop10h 29mMultiple Airlines
Sat 7/68:00 amYYZ - STL
1 stop10h 28mMultiple Airlines
Deal found 6/4$307
Fri 6/147:44 pmSTL - YYZ
1 stop27h 18mMultiple Airlines
Tue 6/188:00 pmYYZ - STL
1 stop18h 05mMultiple Airlines
Deal found 6/6$311
Thu 6/207:45 amSTL - YYZ
2 stops10h 50mMultiple Airlines
Tue 6/256:30 amYYZ - STL
1 stop8h 53mMultiple Airlines
Deal found 6/4$316
Thu 6/138:12 pmSTL - YYZ
1 stop25h 50mMultiple Airlines
Sun 6/167:50 amYYZ - STL
1 stop11h 15mMultiple Airlines
Deal found 6/5$320

St. Louis to Ontario 2024 flight deals

Discover exclusive flight deals for travel between St. Louis and Ontario in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 3,050,429 searches. Data last updated June 6, 2024.
These are some of the most attractive deals on flights from St. Louis to Ontario in 2024. Check back regularly for other flight deals.
Wed 6/191:55 pmSTL - YYZ
1 stop15h 48mMultiple Airlines
Tue 6/256:30 amYYZ - STL
1 stop8h 53mMultiple Airlines
Deal found 6/4$263
Tue 6/187:29 pmSTL - YYZ
1 stop10h 16mMultiple Airlines
Sat 7/68:00 amYYZ - STL
1 stop10h 28mMultiple Airlines
Deal found 6/4$286
Thu 6/137:45 amSTL - YYZ
2 stops12h 15mMultiple Airlines
Tue 6/188:00 pmYYZ - STL
1 stop15h 42mMultiple Airlines
Deal found 6/5$295
Wed 6/191:55 pmSTL - YYZ
1 stop15h 48mMultiple Airlines
Sat 7/138:00 amYYZ - STL
1 stop10h 29mMultiple Airlines
Deal found 6/4$298
Tue 6/2511:57 amSTL - YYZ
1 stop10h 29mMultiple Airlines
Sat 7/138:00 amYYZ - STL
1 stop10h 29mMultiple Airlines
Deal found 6/4$302
Tue 6/1111:57 amSTL - YYZ
1 stop10h 29mMultiple Airlines
Sat 7/68:00 amYYZ - STL
1 stop10h 28mMultiple Airlines
Deal found 6/4$307
Fri 6/147:44 pmSTL - YYZ
1 stop27h 18mMultiple Airlines
Tue 6/188:00 pmYYZ - STL
1 stop18h 05mMultiple Airlines
Deal found 6/6$311
Thu 6/207:45 amSTL - YYZ
2 stops10h 50mMultiple Airlines
Tue 6/256:30 amYYZ - STL
1 stop8h 53mMultiple Airlines
Deal found 6/4$316
Thu 6/138:12 pmSTL - YYZ
1 stop25h 50mMultiple Airlines
Sun 6/167:50 amYYZ - STL
1 stop11h 15mMultiple Airlines
Deal found 6/5$320

St. Louis to Ontario flights leaving soon

Find last-minute flight options from St. Louis to Ontario for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 3,050,429 searches. Data last updated June 6, 2024.
Book one of these great deals on flights from St. Louis to Ontario. Users should double check the flight they book to ensure it matches the day, time, and destination they're looking for.
Thu 6/137:45 amSTL - YYZ
2 stops12h 15mMultiple Airlines
Tue 6/188:00 pmYYZ - STL
1 stop15h 42mMultiple Airlines
Deal found 6/5$295
Tue 6/1111:57 amSTL - YYZ
1 stop10h 29mMultiple Airlines
Sat 7/68:00 amYYZ - STL
1 stop10h 28mMultiple Airlines
Deal found 6/4$307
Fri 6/147:44 pmSTL - YYZ
1 stop27h 18mMultiple Airlines
Tue 6/188:00 pmYYZ - STL
1 stop18h 05mMultiple Airlines
Deal found 6/6$311
Thu 6/138:12 pmSTL - YYZ
1 stop25h 50mMultiple Airlines
Sun 6/167:50 amYYZ - STL
1 stop11h 15mMultiple Airlines
Deal found 6/5$320
Tue 6/117:44 pmSTL - YYZ
1 stop26h 42mMultiple Airlines
Sun 6/167:50 amYYZ - STL
1 stop11h 15mMultiple Airlines
Deal found 6/5$344
Sat 6/1511:34 amSTL - YYZ
1 stop11h 28mMultiple Airlines
Sat 7/68:00 amYYZ - STL
1 stop10h 28mMultiple Airlines
Deal found 6/4$348
Tue 6/1111:57 amSTL - YYZ
1 stop10h 29mMultiple Airlines
Sun 7/79:15 amYYZ - STL
1 stop9h 20mMultiple Airlines
Deal found 6/4$354
Thu 6/137:45 amSTL - YYZ
2 stops12h 15mMultiple Airlines
Sun 6/167:50 amYYZ - STL
1 stop11h 15mMultiple Airlines
Deal found 6/5$356
Thu 6/137:45 amSTL - YYZ
2 stops12h 15mMultiple Airlines
Mon 6/1710:35 amYYZ - STL
1 stop21h 32mMultiple Airlines
Deal found 6/5$360

One-way flights to Ontario from St. Louis

Search for one-way flight options from St. Louis to Ontario. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 3,050,429 searches. Data last updated June 6, 2024.
Users traveling one-way from St. Louis to Ontario can select one of these great deals. Users in need of a round-trip flight from St. Louis to Ontario instead should update the search form at the top of page.
Mon 9/237:57 amSTL - YYZ
1 stop15h 15mMultiple Airlines
Deal found 6/5$123
Thu 7/46:22 pmSTL - YYZ
1 stop18h 33mMultiple Airlines
Deal found 6/5$147
Fri 7/512:23 pmSTL - YYZ
1 stop17h 20mMultiple Airlines
Deal found 6/5$148
Wed 7/107:33 pmSTL - YYZ
1 stop27h 01mMultiple Airlines
Deal found 6/4$152
Mon 6/246:16 pmSTL - YUL
1 stop19h 04mMultiple Airlines
Deal found 6/5$159
Thu 7/46:22 pmSTL - YYZ
2 stops29h 00mMultiple Airlines
Deal found 6/5$166
Fri 8/307:45 amSTL - YYZ
2 stops12h 15mMultiple Airlines
Deal found 6/5$167
Mon 9/237:57 amSTL - YYZ
2 stops12h 10mMultiple Airlines
Deal found 6/5$169
Sat 6/1511:34 amSTL - YUL
1 stop25h 46mMultiple Airlines
Deal found 6/5$172

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 3,050,429 searches. Data last updated June 6, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$263 - $643

Route

Depart

Return

Price

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Wed 6/19

1 stop15h 48m

Toronto Pearson Intl

Tue 6/25

1 stop8h 53m

$263

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 6/18

1 stop10h 16m

Toronto Pearson Intl

Sat 7/6

1 stop10h 28m

$286

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Wed 6/19

1 stop15h 48m

Toronto Pearson Intl

Sat 7/13

1 stop10h 29m

$298

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Sun 6/16

1 stop10h 02m

Toronto Pearson Intl

Sun 7/7

1 stop9h 07m

$380

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 8/13

1 stop7h 29m

Toronto Pearson Intl

Tue 8/20

1 stop10h 02m

$443

Lambert-St LouisMontreal Pierre Elliott Trudeau Intl

STL - YUL

STLYUL

Lambert-St Louis

Tue 9/3

1 stop9h 11m

Montreal Pierre Elliott Trudeau Intl

Sat 9/7

2 stops11h 06m

$451

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Wed 9/11

Nonstop1h 54m

Toronto Pearson Intl

Mon 9/16

Nonstop2h 05m

$533

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 6/27

Nonstop1h 59m

Toronto Pearson Intl

Mon 7/1

1 stop7h 40m

$539

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Sat 6/22

1 stop4h 24m

Toronto Pearson Intl

Wed 7/31

2 stops11h 08m

$643

Flights are sorted by cheapest first

Deals found on 6/4

No data available for this route at this time. Please check back soon.

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.

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 June 6, 2024.
Peruse reviews from past customers who have flown with WestJet, Delta 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.
8.0
Very good
10,368 reviews

Entertainment

8.0

Crew

8.6

Overall

8.0

Food

7.4

Boarding

8.2

Comfort

7.9

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

8.0
Very good
10,368 reviews
8.0
Very good
10,368 reviews

Entertainment

8.0

Crew

8.6

Overall

8.0

Food

7.4

Boarding

8.2

Comfort

7.9

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

7.5
Good
2,856 reviews
8.0
Very good
10,368 reviews

Entertainment

8.0

Crew

8.6

Overall

8.0

Food

7.4

Boarding

8.2

Comfort

7.9

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

7.4
Good
10,696 reviews
8.0
Very good
10,368 reviews

Entertainment

8.0

Crew

8.6

Overall

8.0

Food

7.4

Boarding

8.2

Comfort

7.9

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

7.3
Good
14,227 reviews
8.0
Very good
10,368 reviews

Entertainment

8.0

Crew

8.6

Overall

8.0

Food

7.4

Boarding

8.2

Comfort

7.9

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

7.2
Good
593 reviews
8.0
Very good
10,368 reviews

Entertainment

8.0

Crew

8.6

Overall

8.0

Food

7.4

Boarding

8.2

Comfort

7.9

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

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.

  • Can I find flights from St. Louis to Region of Ontario for under $300 on Cheapflights?

    Yes, there are multiple flights from St. Louis to Region of Ontario for under $300. The cheapest flight booked recently is on Multiple Airlines for just $263, but on average you can expect to pay $346.

  • Are there nonstop flights from St. Louis to Region of Ontario for under $600 on Cheapflights?

    Cheapflights has at least 20 direct flights from St. Louis to Region of Ontario under $600. A good price for a nonstop flight from St. Louis to Region of Ontario is less than $638.

  • Are there last-minute flights available from St. Louis to Region of Ontario for under $300?

    There are currently 20+ open flights from St. Louis to Region of Ontario within the next 7 days for less than $300.

  • 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 $194 on American Airlines. Other airlines that offer cheap prices include Air Canada from $242 and United Airlines from $245 one-way.

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

  • 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 United Airlines (82%), Air Canada (78%) or Jazz (78%) 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 $1,201, our data indicates the cheapest price to be $242. The most popular route (Lambert-St Louis - Toronto Pearson Intl), is priced around $263.

  • What does STL to YYZ mean?

    Great question - STL to YYZ just means Lambert-St Louis Airport to Toronto Pearson Intl Airport. Now you’ll know what these unique codes when you look for flights! This flight route has multiple associated airports, so we think it might be helpful to learn the name and codes of them as well. They are Ottawa Airport (YOW), Hamilton Airport (YHM), Toronto Island Airport (YTZ), Toronto Kitchener-Waterloo Airport (YKF), London Airport (YXU).

  • Can I find deals for flights from St. Louis to Ontario that include extra baggage allowance?

    The amount of baggage you can bring on your St. Louis to Ontario flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from St. Louis to Ontario with specific airlines?

    Yes, Cheapflights allows you to browse and filter St. Louis to Ontario flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • 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.

  • Can I find deals for flights from St. Louis to Ontario that allow pets onboard?

    Many airlines flying from St. Louis to Ontario offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from St. Louis to Ontario?

    Yes, you can often find last-minute deals on St. Louis to Ontario flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the St. Louis to Region of Ontario flight deals updated?

    The St. Louis to Region of Ontario flight deals you see on this page were last updated on 6/6.

  • What are the most popular airlines that fly from St. Louis to Region of Ontario?

  • 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 $237). Flying from St. Louis to Region of Ontario in July is currently the most expensive (average of $387). 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

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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 3,050,429 searches. Data last updated June 6, 2024.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$188Average$446FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$225Average$666FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$299Average$551FlexibilityNo cancel feeOn-time71%

Search flights from St. Louis to Ontario by cabin class

Find flights from St. Louis to Ontario, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Hourly flight availability from St. Louis to Ontario

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 June 6, 2024.
0%of flight departuresEarly morningMidnight to 6 am
50%of flight departuresMorning6 am to noon
50%of flight departuresAfternoonNoon to 6 pm
0%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM
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