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Cheap flights from Ontario to Missouri from C$ 219

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 15/7. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — STL
17 Jun — 24 Jun1
1 adult

Cheap flight deals from Ontario to Missouri

Keep the following information in mind while searching for Ontario to Missouri flight deals. Data was last updated 12 June 2025.

Round-trip from

C$ 455

One-way from

C$ 219

Popular in

December

Cheapest in

October

Average price

C$ 692

Good round-trip deal

C$ 468 or less

Good one-way deal

C$ 504 or less
American Airlines
  • American Airlines
  • 25/9-29/9
  • 2 total stops
  • 18h 30m total
  • Ontario to Missouri
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15/7
  • 15/7
  • 1 total stop
  • 11h 01m total
  • Ontario to Missouri
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (C$ 67 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease (C$ 22 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2025
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Price to beat on a round-trip flight from Ontario to Missouri.
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Price to beat on a one-way flight from Ontario to Missouri.
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Find flight deals from Ontario to Missouri

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 12 June 2025.

Tue 16/99:50 a.m.YYZ - MCI
1 stop8h 48mMultiple Airlines
Fri 19/97:22 p.m.MCI - YYZ
1 stop17h 43mMultiple Airlines
Deal found 11/6C$ 453
Thu 25/912:30 p.m.YUL - STL
1 stop8h 55mAmerican Airlines
Mon 29/95:55 a.m.STL - YUL
1 stop9h 35mAmerican Airlines
Deal found 11/6C$ 455
Sun 14/95:15 p.m.YUL - MCI
1 stop16h 18mAmerican Airlines
Thu 18/97:30 p.m.MCI - YUL
1 stop15h 15mAmerican Airlines
Deal found 11/6C$ 458
Tue 22/76:30 a.m.YYZ - STL
1 stop11h 01mMultiple Airlines
Thu 24/710:47 a.m.STL - YYZ
2 stops33h 36mMultiple Airlines
Deal found 12/6C$ 461
Mon 23/67:25 p.m.YYZ - STL
1 stop5h 34mAmerican Airlines
Thu 26/66:00 a.m.STL - YYZ
1 stop3h 59mAmerican Airlines
Deal found 10/6C$ 463
Thu 26/611:30 a.m.YYZ - STL
Nonstop2h 06mAir Canada
Sun 29/61:30 p.m.STL - YYZ
1 stop15h 55mAir Canada
Deal found 11/6C$ 470
Fri 20/62:27 p.m.YYZ - STL
1 stop7h 26mDelta
Sun 22/67:00 a.m.STL - YYZ
1 stop9h 06mDelta
Deal found 10/6C$ 494
Mon 6/109:00 a.m.YYZ - STL
1 stop26h 49mUnited Airlines
Thu 9/1012:25 p.m.STL - YYZ
1 stop7h 37mUnited Airlines
Deal found 12/6C$ 496
Thu 28/81:16 p.m.YYZ - MCI
1 stop8h 32mAmerican Airlines
Tue 2/95:39 a.m.MCI - YYZ
1 stop7h 53mAmerican Airlines
Deal found 12/6C$ 500
Wed 2/77:00 a.m.YOW - MCI
2 stops16h 01mMultiple Airlines
Tue 8/76:05 a.m.MCI - YOW
1 stop10h 01mMultiple Airlines
Deal found 10/6C$ 518
Thu 10/71:10 p.m.YUL - STL
2 stops21h 42mMultiple Airlines
Thu 17/710:47 a.m.STL - YUL
3 stops26h 03mMultiple Airlines
Deal found 12/6C$ 537
Sun 21/912:20 p.m.YYZ - MCI
1 stop21h 49mUnited Airlines
Wed 24/97:30 a.m.MCI - YYZ
1 stop8h 13mUnited Airlines
Deal found 11/6C$ 552

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 12 June 2025.
Use the filters below to find and compare flights from Ontario to Missouri that are best for you.

Fly from

Ontario

Fly to

Missouri

Route

Depart

Return

Price

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 25/9

12:30 p.m.-8:25 p.m.

1 stop8h 55m

Lambert-St Louis

Mon 29/9

5:55 a.m.-4:30 p.m.

1 stop9h 35m

C$ 455

MontrealKansas City

YUL - MCI

YULMCI

Montreal Pierre Elliott Trudeau Intl

Sun 14/9

5:15 p.m.-8:33 a.m.

1 stop16h 18m

Kansas City

Thu 18/9

7:30 p.m.-11:45 a.m.

1 stop15h 15m

C$ 458

TorontoKansas City

YYZ - MCI

YYZMCI

Toronto Pearson Intl

Tue 1/7

6:30 a.m.-10:10 a.m.

1 stop28h 40m

Kansas City

Fri 4/7

11:00 a.m.-9:08 p.m.

1 stop9h 08m

C$ 459

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Tue 22/7

6:30 a.m.-4:31 p.m.

1 stop11h 01m

Lambert-St Louis

Thu 24/7

10:47 a.m.-9:23 p.m.

2 stops33h 36m

C$ 461

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Mon 23/6

7:25 p.m.-11:59 p.m.

1 stop5h 34m

Lambert-St Louis

Thu 26/6

6:00 a.m.-10:59 a.m.

1 stop3h 59m

C$ 463

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Thu 26/6

11:30 a.m.-12:36 p.m.

Nonstop2h 06m

Lambert-St Louis

Sun 29/6

1:30 p.m.-6:25 a.m.

1 stop15h 55m

C$ 470

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Thu 26/6

10:20 a.m.-3:17 p.m.

1 stop5h 57m

Lambert-St Louis

Sun 29/6

6:40 a.m.-11:18 a.m.

1 stop3h 38m

C$ 494

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Thu 26/6

11:30 a.m.-12:36 p.m.

Nonstop2h 06m

Lambert-St Louis

Sun 29/6

7:30 a.m.-10:25 a.m.

Nonstop1h 55m

C$ 498

TorontoKansas City

YYZ - MCI

YYZMCI

Toronto Pearson Intl

Thu 28/8

1:16 p.m.-8:48 p.m.

1 stop8h 32m

Kansas City

Tue 2/9

5:39 a.m.-2:32 p.m.

1 stop7h 53m

C$ 500

OttawaKansas City

YOW - MCI

YOWMCI

Ottawa

Wed 2/7

7:00 a.m.-10:01 p.m.

2 stops16h 01m

Kansas City

Tue 8/7

6:05 a.m.-5:06 p.m.

1 stop10h 01m

C$ 518

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/6

Showing 1-10 of 54 results
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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

What is the cheapest month to book a flight from Region of Ontario to Missouri?

Currently, January is the cheapest month in which you can book a flight from Region of Ontario to Missouri (average of C$ 365). Flying from Region of Ontario to Missouri in September is currently the most expensive (average of C$ 491). 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 12 June 2025.

When flying from Region of Ontario to Missouri, 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 Region of Ontario to Missouri

Explore weekly flight availability from Ontario to Missouri. 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 12 June 2025.

The most flights from CAON to USMO are scheduled on a Wednesday (4 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (3 on average).

Rainfall in Missouri by month

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

In terms of precipitation, rainfall in Missouri ranges from 28.0 - 132.0 mm per month. May is typically the wettest month, when rainfall can reach 132.0 mm. January is typically the driest time to visit Missouri when rainfall is around 28.0 mm.

Temperature in Missouri by month

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

If weather is an important factor for your trip to Missouri, 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 26.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -2.0 C).

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 12 June 2025.
Read through reviews of airlines operating flights from Ontario to Missouri, such as Alaska Airlines, Delta and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Entertainment

7.1

Overall

8.0

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Entertainment

7.1

Overall

8.0

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,946 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Entertainment

7.1

Overall

8.0

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Entertainment

7.1

Overall

8.0

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Entertainment

7.1

Overall

8.0

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
WestJet
7.2
Good
2,868 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Entertainment

7.1

Overall

8.0

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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.

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

    The cheapest airlines for a one-way flight from Region of Ontario to Missouri are Air Canada (C$ 257), American Airlines (C$ 271), and United Airlines (C$ 301).

  • 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, January is the cheapest month in which you can book a flight from Region of Ontario to Missouri (average of C$ 365). Flying from Region of Ontario to Missouri in September is currently the most expensive (average of C$ 491). 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 12 June 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 423AverageC$ 659FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 474AverageC$ 844FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
DeltaCheapestC$ 549AverageC$ 678FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
WestJetCheapestC$ 552AverageC$ 797FlexibilityNo cancel feeOn-time60%
Search WestJet flights
American AirlinesCheapestC$ 558AverageC$ 715FlexibilityNo cancel feeOn-time71%
Search American Airlines flights

Fly with Cheapflights

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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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