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Cheap flights from St. Louis (STL) to Ontario from $112

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 5/14. 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
Apr 30 — May 71
From?
To?
Tue 4/30
Tue 5/7
1 adult, Economy
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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 52 days before your planned departure. Booking around this time can save you about 181% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $381 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $560.

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

October is one of the best times of the year to fly to Region of Ontario from St. Louis. Prices for October average $441 per person but you can even find prices for as low as $226. The most expensive prices can be found in the month of April. Opting for a October flight can save you 28% on your journey compared to booking in April

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 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 3,068,701 searches. Data last updated April 25, 2024.
Check out some of the cheapest Air Canada flights we've come across from St. Louis to Ontario. It's recommended that users confirm their flight details before booking.
Wed 5/154:05 pmSTL - YYZ
Nonstop2h 01mAir Canada
Thu 5/166:55 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 4/24$530
Wed 5/151:37 pmSTL - YYZ
1 stop8h 11mAir Canada
Thu 5/166:55 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 4/24$540
Sat 5/185:25 pmSTL - YYZ
1 stop5h 33mAir Canada
Sat 5/252:15 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 4/25$560
Wed 9/1110:10 amSTL - YYZ
Nonstop1h 54mAir Canada
Sat 9/142:15 pmYYZ - STL
Nonstop2h 05mAir Canada
Deal found 4/25$571
Wed 9/114:05 pmSTL - YYZ
Nonstop1h 54mAir Canada
Sat 9/143:00 pmYYZ - STL
1 stop7h 05mAir Canada
Deal found 4/25$576
Tue 5/219:50 amSTL - YYZ
Nonstop2h 01mAir Canada
Sat 5/255:00 pmYYZ - STL
1 stop5h 05mAir Canada
Deal found 4/25$588
Sat 6/85:31 pmSTL - YYZ
1 stop5h 27mAir Canada
Wed 6/122:15 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 4/25$592
Fri 7/1910:10 amSTL - YYZ
Nonstop1h 59mAir Canada
Fri 7/196:55 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 4/25$646
Wed 5/2210:10 amSTL - YYZ
1 stop4h 33mAir Canada
Wed 5/292:15 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 4/25$704

Cheap WestJet flights from St. Louis to Ontario

Explore cheap flight options specifically provided by WestJet 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 3,068,701 searches. Data last updated April 25, 2024.
Take a gander at the lowest prices we've found on WestJet flights from St. Louis to Ontario. Check back soon if you're not seeing flights that suit your needs.
Fri 5/243:27 pmSTL - YYZ
1 stop7h 30mWestJet
Sun 5/266:04 amYYZ - STL
1 stop4h 15mWestJet
Deal found 4/24$558
Fri 5/243:27 pmSTL - YYZ
1 stop7h 30mWestJet
Mon 5/2712:00 pmYYZ - STL
2 stops10h 52mWestJet
Deal found 4/25$597
Mon 7/16:00 amSTL - YYZ
1 stop5h 10mWestJet
Mon 7/18:00 pmYYZ - STL
2 stops14h 10mWestJet
Deal found 4/25$613
Fri 5/245:37 pmSTL - YYZ
2 stops11h 13mWestJet
Sun 5/266:15 pmYYZ - STL
2 stops15h 39mWestJet
Deal found 4/24$665
Fri 7/57:15 amSTL - YYZ
1 stop8h 39mWestJet
Sun 7/76:04 amYYZ - STL
1 stop4h 09mWestJet
Deal found 4/25$698

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

Find cheap flight options from St. Louis to Ontario specifically for the months of April and May 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 3,068,701 searches. Prices were last updated on April 25, 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.
Thu 5/167:45 amSTL - YYZ
2 stops10h 50mMultiple Airlines
Fri 5/178:15 pmYYZ - STL
1 stop15h 13mMultiple Airlines
Deal found 4/24$322
Thu 5/167:45 amSTL - YYZ
2 stops10h 50mMultiple Airlines
Fri 5/174:15 pmYYZ - STL
2 stops25h 10mMultiple Airlines
Deal found 4/24$361
Tue 5/217:45 amSTL - YYZ
2 stops10h 50mMultiple Airlines
Sat 5/256:30 amYYZ - STL
1 stop10h 55mMultiple Airlines
Deal found 4/25$369
Wed 5/1511:36 amSTL - YYZ
1 stop9h 24mMultiple Airlines
Thu 5/166:30 amYYZ - STL
1 stop11h 59mMultiple Airlines
Deal found 4/24$376
Tue 5/2110:34 amSTL - YYZ
1 stop9h 41mMultiple Airlines
Sat 5/256:30 amYYZ - STL
1 stop10h 55mMultiple Airlines
Deal found 4/25$377
Tue 5/2110:34 amSTL - YYZ
1 stop9h 41mMultiple Airlines
Sat 5/256:30 amYYZ - STL
1 stop10h 55mMultiple Airlines
Deal found 4/25$378
Thu 5/237:45 amSTL - YYZ
2 stops10h 50mMultiple Airlines
Tue 5/288:20 pmYYZ - STL
1 stop15h 26mMultiple Airlines
Deal found 4/25$379
Tue 5/217:45 amSTL - YYZ
2 stops10h 50mMultiple Airlines
Sat 5/252:00 pmYYZ - STL
3 stops28h 29mMultiple Airlines
Deal found 4/25$402
Fri 5/244:05 pmSTL - YYZ
2 stops25h 50mMultiple Airlines
Sun 5/266:30 amYYZ - STL
1 stop11h 59mMultiple Airlines
Deal found 4/24$406

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 3,068,701 searches. Data last updated April 25, 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.
Thu 5/167:45 amSTL - YYZ
2 stops10h 50mMultiple Airlines
Fri 5/178:15 pmYYZ - STL
1 stop15h 13mMultiple Airlines
Deal found 4/24$322
Thu 5/167:45 amSTL - YYZ
2 stops10h 50mMultiple Airlines
Fri 5/174:15 pmYYZ - STL
2 stops25h 10mMultiple Airlines
Deal found 4/24$361
Tue 5/217:45 amSTL - YYZ
2 stops10h 50mMultiple Airlines
Sat 5/256:30 amYYZ - STL
1 stop10h 55mMultiple Airlines
Deal found 4/25$369
Wed 5/1511:36 amSTL - YYZ
1 stop9h 24mMultiple Airlines
Thu 5/166:30 amYYZ - STL
1 stop11h 59mMultiple Airlines
Deal found 4/24$376
Tue 5/2110:34 amSTL - YYZ
1 stop9h 41mMultiple Airlines
Sat 5/256:30 amYYZ - STL
1 stop10h 55mMultiple Airlines
Deal found 4/25$377
Tue 5/2110:34 amSTL - YYZ
1 stop9h 41mMultiple Airlines
Sat 5/256:30 amYYZ - STL
1 stop10h 55mMultiple Airlines
Deal found 4/25$378
Thu 5/237:45 amSTL - YYZ
2 stops10h 50mMultiple Airlines
Tue 5/288:20 pmYYZ - STL
1 stop15h 26mMultiple Airlines
Deal found 4/25$379
Sun 6/27:30 pmSTL - YYZ
2 stops17h 30mMultiple Airlines
Thu 6/611:25 amYYZ - STL
1 stop8h 57mMultiple Airlines
Deal found 4/25$394
Tue 5/217:45 amSTL - YYZ
2 stops10h 50mMultiple Airlines
Sat 5/252:00 pmYYZ - STL
3 stops28h 29mMultiple Airlines
Deal found 4/25$402

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 3,068,701 searches. Data last updated April 25, 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.
Wed 5/154:05 pmSTL - YYZ
Nonstop2h 01mAir Canada
Thu 5/166:55 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 4/24$530
Wed 9/1110:10 amSTL - YYZ
Nonstop1h 54mAir Canada
Sat 9/142:15 pmYYZ - STL
Nonstop2h 05mAir Canada
Deal found 4/25$571
Mon 7/110:10 amSTL - YYZ
Nonstop1h 59mUnited Airlines
Mon 7/16:55 pmYYZ - STL
Nonstop2h 06mUnited Airlines
Deal found 4/25$583
Wed 5/229:50 amSTL - YYZ
Nonstop2h 01mUnited Airlines
Wed 5/296:55 pmYYZ - STL
Nonstop2h 06mUnited Airlines
Deal found 4/24$584
Tue 5/219:50 amSTL - YYZ
Nonstop2h 01mMultiple Airlines
Sat 5/256:55 pmYYZ - STL
Nonstop2h 06mMultiple Airlines
Deal found 4/25$603
Fri 7/1910:10 amSTL - YYZ
Nonstop1h 59mAir Canada
Fri 7/196:55 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 4/25$646
Fri 6/2111:00 amSTL - YYZ
Nonstop1h 59mUnited Airlines
Mon 6/242:15 pmYYZ - STL
Nonstop2h 06mUnited Airlines
Deal found 4/25$679
Wed 5/224:05 pmSTL - YYZ
Nonstop2h 01mAir Canada
Wed 5/292:15 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 4/25$752
Thu 5/239:50 amSTL - YYZ
Nonstop2h 01mAir Canada
Tue 5/286:55 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 4/25$772

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 3,068,701 searches. Data last updated April 25, 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.
Wed 5/16:00 amSTL - YOW
2 stops9h 37mUnited Airlines
Sun 5/55:55 pmYOW - STL
1 stop5h 27mUnited Airlines
Deal found 4/24$962
Wed 5/111:10 amSTL - YOW
1 stop4h 56mUnited Airlines
Sun 5/55:55 pmYOW - STL
1 stop5h 27mUnited Airlines
Deal found 4/24$978
Wed 5/16:00 amSTL - YOW
2 stops9h 37mUnited Airlines
Sun 5/56:05 amYOW - STL
2 stops9h 18mUnited Airlines
Deal found 4/24$1,006
Wed 5/16:31 amSTL - YOW
1 stop5h 09mUnited Airlines
Sun 5/56:35 amYOW - STL
1 stop8h 48mUnited Airlines
Deal found 4/25$1,061
Wed 5/110:10 amSTL - YOW
1 stop5h 56mUnited Airlines
Sun 5/56:05 amYOW - STL
2 stops9h 18mUnited Airlines
Deal found 4/25$1,071
Wed 5/16:00 amSTL - YOW
2 stops7h 12mUnited Airlines
Sun 5/56:05 amYOW - STL
2 stops9h 18mUnited Airlines
Deal found 4/25$1,076

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 3,068,701 searches. Data last updated April 25, 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.
Tue 5/147:51 pmSTL - YYZ
1 stop9h 44mMultiple Airlines
Deal found 4/25$112
Tue 5/144:50 pmSTL - YYZ
2 stops12h 45mMultiple Airlines
Deal found 4/25$119
Sat 6/2912:03 pmSTL - YYZ
1 stop20h 47mMultiple Airlines
Deal found 4/25$170
Fri 7/197:45 amSTL - YYZ
2 stops12h 15mMultiple Airlines
Deal found 4/25$187
Tue 5/142:35 pmSTL - YYZ
3 stops31h 00mMultiple Airlines
Deal found 4/25$190
Thu 5/27:30 amSTL - YYZ
2 stops12h 25mMultiple Airlines
Deal found 4/25$197
Tue 7/212:50 pmSTL - YYZ
1 stop16h 53mMultiple Airlines
Deal found 4/25$215
Sun 6/307:44 pmSTL - YYZ
1 stop27h 38mMultiple Airlines
Deal found 4/25$216
Fri 5/104:05 pmSTL - YYZ
2 stops25h 50mMultiple Airlines
Deal found 4/25$217

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 3,068,701 searches. Data last updated April 25, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$322 - $558

Route

Depart

Return

Price

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 5/16

2 stops10h 50m

Toronto Pearson Intl

Fri 5/17

1 stop15h 13m

$322

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 5/16

2 stops10h 50m

Toronto Pearson Intl

Fri 5/17

2 stops25h 10m

$361

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 5/21

2 stops10h 50m

Toronto Pearson Intl

Sat 5/25

1 stop10h 55m

$369

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Wed 5/15

1 stop9h 24m

Toronto Pearson Intl

Thu 5/16

1 stop11h 59m

$376

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Sat 6/8

1 stop4h 32m

Toronto Pearson Intl

Wed 6/12

1 stop9h 00m

$458

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Mon 7/1

1 stop7h 58m

Toronto Pearson Intl

Mon 7/1

1 stop18h 18m

$509

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 7/2

1 stop4h 45m

Toronto Pearson Intl

Tue 7/2

1 stop9h 18m

$521

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Wed 5/15

Nonstop2h 01m

Toronto Pearson Intl

Thu 5/16

Nonstop2h 06m

$530

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Fri 5/24

1 stop7h 30m

Toronto Pearson Intl

Sun 5/26

1 stop4h 15m

$558

Flights are sorted by cheapest first

Deals found on 4/24

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 April 25, 2024.
Peruse reviews from past customers who have flown with Air Canada, WestJet 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
9,114 reviews
Check prices

Crew

8.6

Overall

8.1

Food

7.3

Entertainment

7.3

Comfort

7.9

Boarding

8.2

Reviews

1 / 10

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

Alaska Airlines
8.1
Very good
9,114 reviews
Alaska Airlines
8.1
Very good
9,114 reviews
Check prices

Crew

8.6

Overall

8.1

Food

7.3

Entertainment

7.3

Comfort

7.9

Boarding

8.2

Reviews

1 / 10

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

Delta
8.1
Very good
10,975 reviews
Alaska Airlines
8.1
Very good
9,114 reviews
Check prices

Crew

8.6

Overall

8.1

Food

7.3

Entertainment

7.3

Comfort

7.9

Boarding

8.2

Reviews

1 / 10

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

WestJet
7.5
Good
2,985 reviews
Alaska Airlines
8.1
Very good
9,114 reviews
Check prices

Crew

8.6

Overall

8.1

Food

7.3

Entertainment

7.3

Comfort

7.9

Boarding

8.2

Reviews

1 / 10

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

United Airlines
7.4
Good
11,234 reviews
Alaska Airlines
8.1
Very good
9,114 reviews
Check prices

Crew

8.6

Overall

8.1

Food

7.3

Entertainment

7.3

Comfort

7.9

Boarding

8.2

Reviews

1 / 10

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

American Airlines
7.3
Good
14,898 reviews
Alaska Airlines
8.1
Very good
9,114 reviews
Check prices

Crew

8.6

Overall

8.1

Food

7.3

Entertainment

7.3

Comfort

7.9

Boarding

8.2

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 $400 on Cheapflights?

    Yes, there are multiple flights from St. Louis to Region of Ontario for under $400. The cheapest flight booked recently is on Multiple Airlines for just $322, but on average you can expect to pay $408.

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

    Cheapflights has at least 14 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 $730.

  • Are there last-minute flights available from St. Louis to Region of Ontario for under $1,000?

    There are currently 6+ open flights from St. Louis to Region of Ontario within the next 7 days for less than $1,000.

  • 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 $242 on United Airlines. Other airlines that offer cheap prices include Delta from $263 and Air Canada from $295 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 Air Canada (85%), Jazz (85%) or United Airlines (85%) 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 $1,318, our data indicates the cheapest price to be $231. The most popular route (Lambert-St Louis - Toronto Pearson Intl), is priced around $278.

  • 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 4/25.

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 3,068,701 searches. Data last updated April 25, 2024.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$183Average$453FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest$229Average$680FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
American AirlinesCheapest$276Average$526FlexibilityNo 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 April 25, 2024.
0%of flight departuresEarly morningMidnight to 6 am
0%of flight departuresMorning6 am to noon
100%of flight departuresAfternoonNoon to 6 pm
0%of flight departuresEvening6 pm to midnight
Midnight
6 AM
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Cheapflights makes it easy to find St. Louis to Ontario flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

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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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