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Cheap flights from Ontario to Missouri from C$ 255

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 7/6. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — STL
28 May — 4 Jun1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Ontario to Missouri

Enter your travel dates to find the best prices.

Cheapest flights from Ontario to Missouri
Explore the most affordable flight options available from Ontario to Missouri. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 28 April 2026.

Sat 23/52:40 p.m.
YOW
-
STL
1 stop6h 45m
Air Canada
Sun 24/57:05 a.m.
STL
-
YOW
1 stop5h 00m
Air Canada
Deal found 28/4C$ 429
Thu 28/57:00 a.m.
YOW
-
STL
1 stop6h 06m
Air Canada
Sat 30/57:05 a.m.
STL
-
YOW
1 stop5h 00m
Air Canada
Deal found 24/4C$ 436
Sat 23/55:50 p.m.
YOW
-
STL
1 stop6h 45m
United Airlines
Wed 27/56:00 a.m.
STL
-
YOW
1 stop9h 38m
United Airlines
Deal found 26/4C$ 437
Tue 2/610:44 a.m.
YOW
-
STL
1 stop11h 32m
United Airlines
Wed 3/66:00 a.m.
STL
-
YOW
1 stop9h 38m
United Airlines
Deal found 27/4C$ 438
Fri 12/67:00 a.m.
YOW
-
STL
1 stop6h 06m
Air Canada
Fri 19/62:15 p.m.
STL
-
YOW
1 stop6h 00m
Air Canada
Deal found 28/4C$ 448
Wed 27/59:50 a.m.
YYZ
-
STL
1 stop15h 07m
Multiple Airlines
Wed 3/65:27 p.m.
STL
-
YYZ
2 stops29h 13m
Multiple Airlines
Deal found 27/4C$ 486
Tue 26/59:50 a.m.
YYZ
-
STL
1 stop15h 07m
Multiple Airlines
Mon 1/65:27 p.m.
STL
-
YYZ
2 stops19h 38m
Multiple Airlines
Deal found 25/4C$ 493
Thu 28/56:25 a.m.
YOW
-
STL
1 stop10h 21m
United Airlines
Sat 30/55:29 p.m.
STL
-
YOW
2 stops15h 34m
United Airlines
Deal found 24/4C$ 497
Thu 18/64:45 p.m.
YYZ
-
STL
2 stops26h 51m
Multiple Airlines
Wed 24/64:17 p.m.
STL
-
YYZ
1 stop21h 13m
Multiple Airlines
Deal found 25/4C$ 512
Tue 26/59:50 a.m.
YYZ
-
STL
1 stop15h 07m
Multiple Airlines
Wed 3/65:27 p.m.
STL
-
YYZ
2 stops29h 13m
Multiple Airlines
Deal found 25/4C$ 514
Tue 26/59:50 a.m.
YYZ
-
STL
1 stop15h 07m
Multiple Airlines
Sat 30/55:27 p.m.
STL
-
YYZ
2 stops20h 33m
Multiple Airlines
Deal found 25/4C$ 516
Wed 27/57:20 a.m.
YYZ
-
STL
1 stop7h 46m
American Airlines
Wed 10/66:00 a.m.
STL
-
YYZ
1 stop5h 12m
American Airlines
Deal found 28/4C$ 523

Find flight deals from Ontario to Missouri

Keep the following information in mind while searching for Ontario to Missouri flight deals. Data was last updated 28 April 2026.

Round-trip from

C$ 429

One-way from

C$ 255

Popular in

March

Cheapest in

June

Average price

C$ 854

Good round-trip deal

C$ 747 or less
Air Canada
  • Air Canada
  • 23/5-24/5
  • 2 total stops
  • 11h 45m total
  • Ontario to Missouri
Search Deals
Air Canada
  • Air Canada
  • 7/6
  • 1 total stop
  • 6h 06m total
  • Ontario to Missouri
Search Deals
Highest demand for flights based on searches. 23% potential increase in price (C$ 286 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 8% potential price decrease (C$ 73 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
Search Deals
Price to beat on a round-trip flight from Ontario to Missouri.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Missouri 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 28 April 2026.
Use the filters below to find and compare flights from Ontario to Missouri that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 28/5

7:00 a.m.-12:06 p.m.

1 stop6h 06m

Lambert-St Louis

Sat 30/5

7:05 a.m.-1:05 p.m.

1 stop5h 00m

C$ 436

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 24/7

6:25 a.m.-3:46 p.m.

1 stop10h 21m

Lambert-St Louis

Sat 8/8

1:13 p.m.-9:35 p.m.

1 stop7h 22m

C$ 437

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Sat 23/5

2:52 p.m.-9:23 p.m.

2 stops7h 31m

Lambert-St Louis

Wed 27/5

6:00 a.m.-1:59 p.m.

1 stop6h 59m

C$ 437

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 2/6

6:00 a.m.-3:46 p.m.

2 stops10h 46m

Lambert-St Louis

Wed 3/6

6:00 a.m.-4:38 p.m.

1 stop9h 38m

C$ 438

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 28/5

6:25 a.m.-3:46 p.m.

1 stop10h 21m

Lambert-St Louis

Sat 30/5

5:29 p.m.-10:03 a.m.

2 stops15h 34m

C$ 497
Quickest round-trip

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Wed 3/6

11:00 a.m.-12:06 p.m.

Nonstop2h 06m

Lambert-St Louis

Wed 10/6

2:15 p.m.-5:06 p.m.

Nonstop1h 51m

C$ 575

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Mon 18/5

4:00 p.m.-8:25 p.m.

1 stop5h 25m

Lambert-St Louis

Fri 22/5

7:05 a.m.-9:56 a.m.

Nonstop1h 51m

C$ 579

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Wed 3/6

7:55 a.m.-3:40 p.m.

1 stop8h 45m

Lambert-St Louis

Sat 6/6

6:45 a.m.-11:19 a.m.

1 stop3h 34m

C$ 581

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 2/6

7:00 a.m.-4:10 p.m.

1 stop10h 10m

Lambert-St Louis

Wed 3/6

5:15 p.m.-11:57 p.m.

1 stop5h 42m

C$ 582

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 10/5

7:00 a.m.-12:20 p.m.

1 stop6h 20m

Lambert-St Louis

Sat 16/5

12:59 p.m.-11:57 p.m.

1 stop9h 58m

C$ 582

Flights are sorted by cheapest round-trip flights first.

Deals found on 24/4

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from Ontario to Missouri

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

How far ahead should I book a flight from Region of Ontario to Missouri?

Booking 67 days in advance of your planned departure date is, on average, the best time to get cheap flights from Region of Ontario to Missouri. 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 Region of Ontario to Missouri?

Currently, December is the cheapest month in which you can book a flight from Region of Ontario to Missouri (average of C$ 229). Flying from Region of Ontario to Missouri in April is currently the most expensive (average of C$ 486). 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 ON to MO?

Find hourly flight availability from Ontario to Missouri. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 28 April 2026.

A simple way to save on the total cost of your ticket is to fly from Region of Ontario to Missouri at noon. If you’re flexible enough to do this you can expect to save up to 20% on your trip compared to booking a flight in the evening.

How much does it cost to fly round-trip from Region of Ontario to Missouri?

Reviews of airlines servicing Missouri

Get insights into the airlines that provide service to Missouri. 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 Missouri. Reviews last updated 28 April 2026.
Get a feel of what it's like to fly with Delta,United Airlines, andWestJet from Ontario to Missouri by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,466 reviews
Check prices

Comfort

7.9

Crew

8.5

Food

7.2

Overall

7.9

Entertainment

7.8

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,466 reviews
Delta
7.9
Good
8,466 reviews
Check prices

Comfort

7.9

Crew

8.5

Food

7.2

Overall

7.9

Entertainment

7.8

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,672 reviews
Delta
7.9
Good
8,466 reviews
Check prices

Comfort

7.9

Crew

8.5

Food

7.2

Overall

7.9

Entertainment

7.8

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
WestJet
7.2
Good
3,327 reviews
Delta
7.9
Good
8,466 reviews
Check prices

Comfort

7.9

Crew

8.5

Food

7.2

Overall

7.9

Entertainment

7.8

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
American Airlines
7.1
Good
11,674 reviews
Delta
7.9
Good
8,466 reviews
Check prices

Comfort

7.9

Crew

8.5

Food

7.2

Overall

7.9

Entertainment

7.8

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Air Canada
7.1
Good
10,975 reviews
Delta
7.9
Good
8,466 reviews
Check prices

Comfort

7.9

Crew

8.5

Food

7.2

Overall

7.9

Entertainment

7.8

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Missouri. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Region of Ontario to Missouri?

    Airlines like Air Canada, United Airlines, and Delta fly from Region of Ontario to Missouri in about 6h 45m. The time it takes to get you to your destination can typically vary by up to 2h. The distance between Region of Ontario and Missouri is about 1413 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • Can I find deals for flights from Ontario to Missouri that include hotel bookings?

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

  • How can I find direct flights from Ontario to Missouri?

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

  • Can I find deals for business class flights from Ontario to Missouri?

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

    Currently, December is the cheapest month in which you can book a flight from Region of Ontario to Missouri (average of C$ 229). Flying from Region of Ontario to Missouri in April is currently the most expensive (average of C$ 486). 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

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Alternative routes for Ontario to Missouri

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Ontario to Missouri

Discover the top 5 airlines that operate flights from Ontario to Missouri. 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 28 April 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 280AverageC$ 756FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 334AverageC$ 681FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
American AirlinesCheapestC$ 361AverageC$ 741FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
DeltaCheapestC$ 469AverageC$ 697FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
WestJetCheapestC$ 551AverageC$ 952FlexibilityNo cancel feeOn-time60%
Search WestJet 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 Ontario to Missouri?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Ontario to Missouri. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Ontario to Missouri?

Cheapflights helps you find that perfect flight to Missouri from Ontario by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Ontario to Missouri with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Ontario to Missouri, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Ontario to Missouri 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!

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