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Cheap flights from Ontario to Missouri from C$ 241
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 25/10. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — STL
5 Aug — 12 Aug1
Round-trip
1 adult
Economy
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 31 July 2025.
Find flight deals from Ontario to Missouri
Cheapest flights from Ontario to MissouriExplore 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 31 July 2025.
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 31 July 2025.
Sat 25/107:15 a.m.YYZ - MCI
1 stop16h 52mMultiple Airlines
Sun 26/105:15 a.m.MCI - YYZ
1 stop8h 05mMultiple Airlines
Deal found 29/7C$ 378
Sat 8/114:44 p.m.YYZ - STL
1 stop8h 12mAmerican Airlines
Sat 15/116:00 a.m.STL - YYZ
1 stop9h 04mAmerican Airlines
Deal found 29/7C$ 444
Sat 13/912:31 p.m.YUL - STL
1 stop10h 22mAmerican Airlines
Sat 20/92:01 p.m.STL - YUL
1 stop20h 45mAmerican Airlines
Deal found 30/7C$ 451
Sat 30/86:45 a.m.YUL - MCI
1 stop17h 08mMultiple Airlines
Sat 6/95:15 a.m.MCI - YUL
1 stop8h 05mMultiple Airlines
Deal found 31/7C$ 465
Sat 8/112:00 p.m.YYZ - STL
Nonstop2h 29mAir Canada
Sat 15/114:05 p.m.STL - YYZ
Nonstop2h 01mAir Canada
Deal found 29/7C$ 511
Mon 24/113:30 p.m.YYZ - STL
1 stop8h 15mUnited Airlines
Fri 28/116:30 a.m.STL - YYZ
1 stop8h 31mUnited Airlines
Deal found 31/7C$ 554
Mon 8/96:00 a.m.YUL - STL
1 stop27h 06mDelta
Tue 16/96:40 a.m.STL - YUL
1 stop4h 20mDelta
Deal found 29/7C$ 565
Tue 9/911:44 a.m.YYZ - MCI
1 stop10h 03mAmerican Airlines
Mon 15/97:30 p.m.MCI - YYZ
1 stop14h 29mAmerican Airlines
Deal found 31/7C$ 574
Sat 15/117:14 a.m.YUL - MCI
2 stops12h 04mAmerican Airlines
Mon 17/116:05 a.m.MCI - YUL
1 stop8h 06mAmerican Airlines
Deal found 30/7C$ 587
Mon 8/96:10 p.m.YUL - STL
Nonstop2h 47mAir Canada
Tue 16/99:15 a.m.STL - YUL
1 stop6h 05mAir Canada
Deal found 29/7C$ 591
Sun 7/96:45 a.m.YYZ - STL
2 stops18h 14mMultiple Airlines
Thu 11/910:35 a.m.STL - YYZ
1 stop9h 20mMultiple Airlines
Deal found 30/7C$ 596
Wed 27/86:15 a.m.YUL - STL
1 stop10h 29mUnited Airlines
Wed 3/97:04 p.m.STL - YUL
1 stop14h 36mUnited Airlines
Deal found 30/7C$ 616
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 31 July 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
TorontoKansas City
YYZ - MCI
YYZMCI
Toronto Pearson Intl
Sat 25/10
7:15 a.m.-11:07 p.m.
1 stop16h 52m
Kansas City
Sun 26/10
5:15 a.m.-2:20 p.m.
1 stop8h 05m
C$ 378
TorontoSt. Louis
YYZ - STL
YYZSTL
Toronto Pearson Intl
Tue 21/10
1:15 p.m.-8:26 p.m.
1 stop8h 11m
Lambert-St Louis
Mon 27/10
7:16 a.m.-5:40 p.m.
1 stop9h 24m
C$ 450
MontrealSt. Louis
YUL - STL
YULSTL
Montreal Pierre Elliott Trudeau Intl
Sat 13/9
12:31 p.m.-9:53 p.m.
1 stop10h 22m
Lambert-St Louis
Sat 20/9
2:01 p.m.-11:46 a.m.
1 stop20h 45m
C$ 451
MontrealKansas City
YUL - MCI
YULMCI
Montreal Pierre Elliott Trudeau Intl
Sat 30/8
6:45 a.m.-10:53 p.m.
1 stop17h 08m
Kansas City
Sat 6/9
5:15 a.m.-2:20 p.m.
1 stop8h 05m
C$ 465
TorontoSt. Louis
YYZ - STL
YYZSTL
Toronto Pearson Intl
Wed 27/8
3:00 p.m.-8:00 p.m.
1 stop6h 00m
Lambert-St Louis
Wed 3/9
9:15 a.m.-12:11 p.m.
Nonstop1h 56m
C$ 545
MontrealSt. Louis
YUL - STL
YULSTL
Montreal Pierre Elliott Trudeau Intl
Mon 8/9
6:00 a.m.-8:06 a.m.
1 stop27h 06m
Lambert-St Louis
Tue 16/9
6:40 a.m.-12:00 p.m.
1 stop4h 20m
C$ 565
TorontoKansas City
YYZ - MCI
YYZMCI
Toronto Pearson Intl
Tue 9/9
11:44 a.m.-8:47 p.m.
1 stop10h 03m
Kansas City
Mon 15/9
7:30 p.m.-10:59 a.m.
1 stop14h 29m
C$ 574
MontrealKansas City
YUL - MCI
YULMCI
Montreal Pierre Elliott Trudeau Intl
Sat 15/11
7:14 a.m.-6:18 p.m.
2 stops12h 04m
Kansas City
Mon 17/11
6:05 a.m.-3:11 p.m.
1 stop8h 06m
C$ 587
MontrealSt. Louis
YUL - STL
YULSTL
Montreal Pierre Elliott Trudeau Intl
Mon 8/9
6:10 p.m.-7:57 p.m.
Nonstop2h 47m
Lambert-St Louis
Tue 16/9
9:15 a.m.-4:20 p.m.
1 stop6h 05m
C$ 591
TorontoSt. Louis
YYZ - STL
YYZSTL
Toronto Pearson Intl
Sun 7/9
6:45 a.m.-11:59 p.m.
2 stops18h 14m
Lambert-St Louis
Thu 11/9
10:35 a.m.-8:55 p.m.
1 stop9h 20m
C$ 596
Showing 1-10 of 50 results
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 31 July 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 31 July 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 (2 on average).
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 31 July 2025.
Get a feel of what it's like to fly with Alaska Airlines,Delta, andUnited Airlines 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.
Overall
8.0
Boarding
8.1
Food
7.1
Entertainment
7.1
Comfort
7.8
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,Jul 2025
YEG - SEA
Overall
8.0
Boarding
8.1
Food
7.1
Entertainment
7.1
Comfort
7.8
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,Jul 2025
YEG - SEA
Overall
8.0
Boarding
8.1
Food
7.1
Entertainment
7.1
Comfort
7.8
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,Jul 2025
YEG - SEA
Overall
8.0
Boarding
8.1
Food
7.1
Entertainment
7.1
Comfort
7.8
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,Jul 2025
YEG - SEA
Overall
8.0
Boarding
8.1
Food
7.1
Entertainment
7.1
Comfort
7.8
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,Jul 2025
YEG - SEA
Overall
8.0
Boarding
8.1
Food
7.1
Entertainment
7.1
Comfort
7.8
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,Jul 2025
YEG - SEA
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.
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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.
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 31 July 2025.
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!