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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 5/30. 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
May 13 — May 201
From?
To?
Mon 5/13
Mon 5/20
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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 $367 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 78% on your journey compared to booking in February

When is the cheapest time to fly from St. Louis to Region of Ontario (STL - 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 American Airlines flights from St. Louis to Ontario

Explore cheap flight options specifically provided by American Airlines for the route between St. Louis and Ontario. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,752,338 searches. Data last updated May 8, 2024.
Check out some of the cheapest American Airlines flights we've come across from St. Louis to Ontario. It's recommended that users confirm their flight details before booking.
Thu 6/206:00 amSTL - YYZ
1 stop5h 40mAmerican Airlines
Thu 6/203:45 pmYYZ - STL
1 stop9h 18mAmerican Airlines
Deal found 5/7$431
Thu 5/304:20 pmSTL - YYZ
1 stop5h 00mAmerican Airlines
Thu 6/63:45 pmYYZ - STL
1 stop9h 18mAmerican Airlines
Deal found 5/8$465
Wed 5/228:07 amSTL - YYZ
1 stop9h 23mAmerican Airlines
Sun 5/266:00 amYYZ - STL
1 stop10h 28mAmerican Airlines
Deal found 5/7$466
Mon 6/246:11 amSTL - YYZ
1 stop15h 58mAmerican Airlines
Thu 6/275:19 pmYYZ - STL
2 stops16h 17mAmerican Airlines
Deal found 5/7$691

Cheap Air Canada flights from St. Louis to Ontario

Explore cheap flight options specifically provided by Air Canada for the route between St. Louis and Ontario. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,752,338 searches. Data last updated May 8, 2024.
Take a gander at the lowest prices we've found on Air Canada flights from St. Louis to Ontario. Check back soon if you're not seeing flights that suit your needs.
Sat 6/19:50 amSTL - YYZ
Nonstop2h 01mAir Canada
Sun 6/22:15 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 5/7$438
Sat 6/19:50 amSTL - YYZ
Nonstop2h 01mAir Canada
Sun 6/22:15 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 5/7$442
Wed 9/114:05 pmSTL - YYZ
Nonstop1h 54mAir Canada
Sat 9/142:15 pmYYZ - STL
Nonstop2h 05mAir Canada
Deal found 5/7$443
Wed 5/229:50 amSTL - YYZ
Nonstop2h 01mAir Canada
Sun 5/264:00 pmYYZ - STL
1 stop6h 05mAir Canada
Deal found 5/8$448
Thu 5/308:05 amSTL - YYZ
1 stop5h 47mAir Canada
Thu 6/66:55 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 5/8$453
Wed 9/119:30 amSTL - YYZ
1 stop5h 13mAir Canada
Sat 9/145:00 pmYYZ - STL
1 stop5h 05mAir Canada
Deal found 5/7$458
Fri 8/165:30 pmSTL - YYZ
1 stop5h 28mAir Canada
Mon 8/196:55 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 5/6$476
Wed 6/59:50 amSTL - YYZ
Nonstop2h 01mAir Canada
Thu 6/62:15 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 5/7$509
Sun 6/25:31 pmSTL - YYZ
1 stop5h 27mAir Canada
Sun 6/96:55 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 5/8$518

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

Find cheap flight options from St. Louis to Ontario specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,752,338 searches. Prices were last updated on May 8, 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.
Tue 6/42:35 pmSTL - YYZ
2 stops20h 40mMultiple Airlines
Tue 6/118:20 pmYYZ - STL
1 stop17h 45mMultiple Airlines
Deal found 5/7$243
Wed 6/51:55 pmSTL - YYZ
1 stop15h 47mMultiple Airlines
Sat 6/86:30 amYYZ - STL
1 stop11h 58mMultiple Airlines
Deal found 5/8$264
Tue 6/47:23 pmSTL - YYZ
1 stop10h 12mMultiple Airlines
Tue 6/116:30 amYYZ - STL
1 stop8h 53mMultiple Airlines
Deal found 5/7$270
Wed 6/51:55 pmSTL - YYZ
1 stop15h 47mMultiple Airlines
Tue 6/118:20 pmYYZ - STL
1 stop17h 45mMultiple Airlines
Deal found 5/7$273
Tue 6/42:35 pmSTL - YYZ
1 stop7h 51mMultiple Airlines
Thu 6/66:30 amYYZ - STL
1 stop11h 58mMultiple Airlines
Deal found 5/7$283
Tue 6/42:35 pmSTL - YYZ
2 stops20h 40mMultiple Airlines
Tue 6/1111:59 amYYZ - STL
3 stops26h 06mMultiple Airlines
Deal found 5/7$298
Tue 6/42:35 pmSTL - YYZ
3 stops22h 25mMultiple Airlines
Thu 6/66:30 amYYZ - STL
1 stop11h 58mMultiple Airlines
Deal found 5/7$300
Tue 5/147:30 amSTL - YYZ
2 stops11h 05mMultiple Airlines
Tue 5/218:20 pmYYZ - STL
1 stop15h 26mMultiple Airlines
Deal found 5/6$315
Wed 6/51:55 pmSTL - YYZ
2 stops15h 57mMultiple Airlines
Sat 6/86:30 amYYZ - STL
1 stop11h 58mMultiple Airlines
Deal found 5/8$316

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 2,752,338 searches. Data last updated May 8, 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.
Tue 6/42:35 pmSTL - YYZ
2 stops20h 40mMultiple Airlines
Tue 6/118:20 pmYYZ - STL
1 stop17h 45mMultiple Airlines
Deal found 5/7$243
Wed 6/51:55 pmSTL - YYZ
1 stop15h 47mMultiple Airlines
Sat 6/86:30 amYYZ - STL
1 stop11h 58mMultiple Airlines
Deal found 5/8$264
Tue 6/47:23 pmSTL - YYZ
1 stop10h 12mMultiple Airlines
Tue 6/116:30 amYYZ - STL
1 stop8h 53mMultiple Airlines
Deal found 5/7$270
Wed 6/51:55 pmSTL - YYZ
1 stop15h 47mMultiple Airlines
Tue 6/118:20 pmYYZ - STL
1 stop17h 45mMultiple Airlines
Deal found 5/7$273
Tue 6/42:35 pmSTL - YYZ
1 stop7h 51mMultiple Airlines
Thu 6/66:30 amYYZ - STL
1 stop11h 58mMultiple Airlines
Deal found 5/7$283
Tue 6/42:35 pmSTL - YYZ
2 stops20h 40mMultiple Airlines
Tue 6/1111:59 amYYZ - STL
3 stops26h 06mMultiple Airlines
Deal found 5/7$298
Tue 6/42:35 pmSTL - YYZ
3 stops22h 25mMultiple Airlines
Thu 6/66:30 amYYZ - STL
1 stop11h 58mMultiple Airlines
Deal found 5/7$300
Tue 5/147:30 amSTL - YYZ
2 stops11h 05mMultiple Airlines
Tue 5/218:20 pmYYZ - STL
1 stop15h 26mMultiple Airlines
Deal found 5/6$315
Wed 6/51:55 pmSTL - YYZ
2 stops15h 57mMultiple Airlines
Sat 6/86:30 amYYZ - STL
1 stop11h 58mMultiple Airlines
Deal found 5/8$316

Non-stop flights to Ontario from St. Louis

Discover non-stop flight options from St. Louis to Ontario. Find direct flights with no layovers, providing a convenient travel experience. Explore non-stop flight options based on user searches, and compare prices and availability for your desired travel dates. Over the last 7 days, Cheapflights users made 2,752,338 searches. Data last updated May 8, 2024.
If you're seeking options on non-stop flights from St. Louis to Ontario, check out these fares. If you're looking for other options for flights from St. Louis to Ontario, make sure to update the search form at the top of page.
Sat 6/19:50 amSTL - YYZ
Nonstop2h 01mAir Canada
Sun 6/22:15 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 5/7$438
Sat 6/19:50 amSTL - YYZ
Nonstop2h 01mAir Canada
Sun 6/22:15 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 5/7$442
Wed 5/229:50 amSTL - YYZ
Nonstop2h 01mAir Canada
Sun 5/266:55 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 5/8$443
Fri 8/164:05 pmSTL - YYZ
Nonstop1h 59mAir Canada
Mon 8/196:55 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 5/6$466
Mon 6/2411:00 amSTL - YYZ
Nonstop1h 59mUnited Airlines
Thu 6/272:15 pmYYZ - STL
Nonstop2h 06mUnited Airlines
Deal found 5/7$497
Thu 8/294:05 pmSTL - YYZ
Nonstop1h 59mAir Canada
Sun 9/12:15 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 5/7$509
Mon 6/39:50 amSTL - YYZ
Nonstop2h 01mMultiple Airlines
Mon 6/102:15 pmYYZ - STL
Nonstop2h 06mMultiple Airlines
Deal found 5/6$514
Wed 5/229:50 amSTL - YYZ
Nonstop2h 01mAir Canada
Sun 5/262:15 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 5/7$529
Tue 5/289:50 amSTL - YYZ
Nonstop2h 01mAir Canada
Tue 6/46:55 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 5/7$541

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 2,752,338 searches. Data last updated May 8, 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.
Tue 5/147:30 amSTL - YYZ
2 stops11h 05mMultiple Airlines
Tue 5/218:20 pmYYZ - STL
1 stop15h 26mMultiple Airlines
Deal found 5/6$315
Thu 5/167:45 amSTL - YYZ
2 stops10h 50mMultiple Airlines
Mon 5/208:00 pmYYZ - STL
1 stop15h 13mMultiple Airlines
Deal found 5/7$333
Tue 5/147:51 pmSTL - YYZ
1 stop9h 51mMultiple Airlines
Tue 5/217:50 amYYZ - STL
1 stop6h 47mMultiple Airlines
Deal found 5/6$350
Thu 5/167:45 amSTL - YYZ
2 stops10h 50mMultiple Airlines
Mon 5/207:45 amYYZ - STL
2 stops26h 54mMultiple Airlines
Deal found 5/7$386
Tue 5/147:30 amSTL - YYZ
2 stops11h 05mMultiple Airlines
Tue 5/216:30 amYYZ - STL
2 stops29h 16mMultiple Airlines
Deal found 5/6$403
Tue 5/147:30 amSTL - YYZ
2 stops11h 05mMultiple Airlines
Tue 5/212:40 pmYYZ - STL
3 stops21h 06mMultiple Airlines
Deal found 5/6$408
Thu 5/167:44 pmSTL - YYZ
1 stop26h 42mMultiple Airlines
Mon 5/2012:30 pmYYZ - STL
1 stop5h 52mMultiple Airlines
Deal found 5/7$624
Tue 5/148:05 amSTL - YYZ
1 stop4h 40mMultiple Airlines
Tue 5/212:15 pmYYZ - STL
Nonstop2h 06mMultiple Airlines
Deal found 5/6$736
Thu 5/163:15 pmSTL - YYZ
1 stop16h 30mUnited Airlines
Mon 5/206:55 pmYYZ - STL
Nonstop2h 06mUnited Airlines
Deal found 5/7$812

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 2,752,338 searches. Data last updated May 8, 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.
Thu 5/307:45 amSTL - YYZ
2 stops10h 50mMultiple Airlines
Deal found 5/7$123
Thu 5/307:30 pmSTL - YYZ
1 stop26h 56mMultiple Airlines
Deal found 5/7$132
Sun 5/197:45 amSTL - YYZ
2 stops10h 50mMultiple Airlines
Deal found 5/7$146
Fri 6/217:30 pmSTL - YYZ
2 stops23h 05mMultiple Airlines
Deal found 5/7$157
Fri 6/217:30 pmSTL - YYZ
2 stops23h 05mMultiple Airlines
Deal found 5/7$165
Sun 5/197:45 amSTL - YYZ
2 stops10h 50mMultiple Airlines
Deal found 5/8$184
Thu 5/306:19 pmSTL - YYZ
3 stops25h 41mMultiple Airlines
Deal found 5/7$186
Fri 6/217:00 amSTL - YYZ
1 stop10h 38mAmerican Airlines
Deal found 5/7$205
Fri 6/211:10 pmSTL - YYZ
1 stop6h 42mDelta
Deal found 5/7$207

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 2,752,338 searches. Data last updated May 8, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$243 - $537

Route

Depart

Return

Price

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 6/4

2 stops20h 40m

Toronto Pearson Intl

Tue 6/11

1 stop17h 45m

$243

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 6/4

1 stop10h 12m

Toronto Pearson Intl

Tue 6/11

1 stop8h 53m

$270

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Wed 6/5

1 stop15h 47m

Toronto Pearson Intl

Tue 6/11

1 stop17h 45m

$273

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 6/4

1 stop7h 51m

Toronto Pearson Intl

Thu 6/6

1 stop11h 58m

$283

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 6/20

1 stop5h 40m

Toronto Pearson Intl

Thu 6/20

1 stop9h 18m

$431

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Sat 6/1

Nonstop2h 01m

Toronto Pearson Intl

Sun 6/2

Nonstop2h 06m

$438

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Mon 6/3

1 stop5h 55m

Toronto Pearson Intl

Mon 6/10

1 stop14h 51m

$447

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 6/4

1 stop8h 06m

Toronto Pearson Intl

Thu 6/6

Nonstop2h 06m

$452

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 6/4

1 stop4h 09m

Toronto Pearson Intl

Wed 6/5

2 stops10h 53m

$537

Flights are sorted by cheapest first

Deals found on 5/7

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

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 May 8, 2024.
Peruse reviews from past customers who have flown with American Airlines, Air Canada and Delta 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
8.1
Very good
9,141 reviews
Check prices

Entertainment

7.3

Overall

8.1

Crew

8.6

Boarding

8.2

Comfort

7.9

Food

7.3

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

Alaska Airlines
8.1
Very good
9,141 reviews
Alaska Airlines
8.1
Very good
9,141 reviews
Check prices

Entertainment

7.3

Overall

8.1

Crew

8.6

Boarding

8.2

Comfort

7.9

Food

7.3

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

Delta
8.1
Very good
10,789 reviews
Alaska Airlines
8.1
Very good
9,141 reviews
Check prices

Entertainment

7.3

Overall

8.1

Crew

8.6

Boarding

8.2

Comfort

7.9

Food

7.3

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

WestJet
7.6
Good
2,945 reviews
Alaska Airlines
8.1
Very good
9,141 reviews
Check prices

Entertainment

7.3

Overall

8.1

Crew

8.6

Boarding

8.2

Comfort

7.9

Food

7.3

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

United Airlines
7.4
Good
11,043 reviews
Alaska Airlines
8.1
Very good
9,141 reviews
Check prices

Entertainment

7.3

Overall

8.1

Crew

8.6

Boarding

8.2

Comfort

7.9

Food

7.3

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

American Airlines
7.3
Good
14,677 reviews
Alaska Airlines
8.1
Very good
9,141 reviews
Check prices

Entertainment

7.3

Overall

8.1

Crew

8.6

Boarding

8.2

Comfort

7.9

Food

7.3

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

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 $243, but on average you can expect to pay $336.

  • Are there nonstop flights from St. Louis to Region of Ontario for under $500 on Cheapflights?

    Cheapflights has at least 19 direct flights from St. Louis to Region of Ontario under $500. A good price for a nonstop flight from St. Louis to Region of Ontario is less than $699.

  • Are there last-minute flights available from St. Louis to Region of Ontario for under $400?

    There are currently 11+ open flights from St. Louis to Region of Ontario within the next 7 days for less than $400.

  • 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 $205 on American Airlines. Other airlines that offer cheap prices include Delta from $207 and United Airlines from $263 one-way.

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

    American Airlines, Air Canada and United Airlines are the most popular airlines when flying 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 (94%), Air Canada (89%) or Jazz (89%) 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 $1,883, our data indicates the cheapest price to be $231. The most popular route (Lambert-St Louis - Toronto Pearson Intl), is priced around $258.

  • 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), Toronto Island Airport (YTZ), Hamilton Airport (YHM), London Airport (YXU), Toronto Kitchener-Waterloo Airport (YKF).

  • 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 5/8.

See more FAQs

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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.

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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 2,752,338 searches. Data last updated May 8, 2024.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$188Average$450FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest$228Average$680FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
American AirlinesCheapest$282Average$542FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
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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.
First Class
Business Class
Prem Econ Class
Economy 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 May 8, 2024.
1%of flight departuresEarly morningMidnight to 6 am
43%of flight departuresMorning6 am to noon
56%of flight departuresAfternoonNoon to 6 pm
0%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

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Can Cheapflights find flights from St. Louis to Ontario with no change fees?

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Can Cheapflights notify me if prices for flights from St. Louis to Ontario become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Ontario from St. Louis today and book when prices fit your budget.

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