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Cheap flights from Ontario to Missouri from $142

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Missouri departing on 3/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Ontario to Missouri

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
7:10 am - 10:27 pm
YYZ
-
STL
16h 17m
1 stop
Multiple Airlines Logo
4:51 pm - 2:20 pm
STL
-
YYZ
20h 29m
1 stop
$236Multiple Airlines
mié., mar. 4 - lun., mar. 9
Multiple Airlines Logo
7:10 am - 10:27 pm
YYZ
-
STL
16h 17m
1 stop
Multiple Airlines Logo
11:32 am - 11:20 pm
STL
-
YYZ
34h 48m
2 stops
$257Multiple Airlines
mié., mar. 4 - mié., mar. 11
United Airlines Logo
5:20 pm - 9:08 pm
YOW
-
STL
4h 48m
1 stop
United Airlines Logo
7:45 am - 1:59 pm
STL
-
YOW
5h 14m
1 stop
$318United Airlines
jue., abr. 9 - sáb., abr. 11
United Airlines Logo
7:30 pm - 10:36 am
YOW
-
MCI
16h 06m
2 stops
United Airlines Logo
11:32 am - 9:56 pm
MCI
-
YOW
9h 24m
2 stops
$319United Airlines
lun., feb. 23 - mié., feb. 25
American Airlines Logo
12:30 pm - 11:46 pm
YUL
-
STL
12h 16m
1 stop
American Airlines Logo
5:21 pm - 11:44 am
STL
-
YUL
17h 23m
1 stop
$349American Airlines
lun., abr. 20 - sáb., abr. 25
American Airlines Logo
12:30 pm - 11:46 pm
YUL
-
STL
12h 16m
1 stop
American Airlines Logo
8:03 pm - 11:44 am
STL
-
YUL
14h 41m
1 stop
$350American Airlines
lun., abr. 20 - sáb., abr. 25
Air Canada Logo
7:15 am - 3:29 pm
YOW
-
STL
9h 14m
1 stop
Air Canada Logo
4:05 pm - 11:18 pm
STL
-
YOW
6h 13m
1 stop
$367Air Canada
dom., mar. 1 - mié., mar. 4
Air Canada Logo
7:15 am - 3:29 pm
YOW
-
STL
9h 14m
1 stop
Air Canada Logo
4:05 pm - 11:18 pm
STL
-
YOW
6h 13m
1 stop
$368Air Canada
dom., mar. 1 - mié., mar. 4
Delta Logo
5:40 am - 5:02 pm
YOW
-
MCI
12h 22m
2 stops
Delta Logo
10:41 am - 12:39 am
MCI
-
YOW
12h 58m
2 stops
$427Delta
mar., feb. 17 - jue., feb. 19
Delta Logo
5:40 am - 4:42 pm
YOW
-
STL
12h 02m
2 stops
Delta Logo
10:14 am - 12:39 am
STL
-
YOW
13h 25m
2 stops
$439Delta
dom., mar. 1 - mié., mar. 4

Air Canada flights from Region of Ontario to Missouri

Our best Air Canada deals on Region of Ontario to Missouri flight tickets
Air Canada
Mar 1
YOW7:15 amOttawa
9h 14m
1 stop
STL3:29 pmLambert-St Louis
Mar 4
STL4:05 pmLambert-St Louis
6h 13m
1 stop
YOW11:18 pmOttawa
$367
Air Canada
Mar 1
YOW7:15 amOttawa
9h 14m
1 stop
STL3:29 pmLambert-St Louis
Mar 4
STL4:05 pmLambert-St Louis
6h 13m
1 stop
YOW11:18 pmOttawa
$368
Air Canada
Apr 9
YOW9:15 amOttawa
7h 09m
1 stop
STL3:24 pmLambert-St Louis
Apr 11
STL7:45 amLambert-St Louis
10h 49m
2 stops
YOW7:34 pmOttawa
$387

American Airlines flights from Region of Ontario to Missouri

Our best American Airlines deals on Region of Ontario to Missouri flight tickets
American Airlines
Apr 20
YUL12:30 pmMontreal Pierre Elliott Trudeau Intl
12h 16m
1 stop
STL11:46 pmLambert-St Louis
Apr 25
STL5:21 pmLambert-St Louis
17h 23m
1 stop
YUL11:44 amMontreal Pierre Elliott Trudeau Intl
$349
American Airlines
Apr 20
YUL12:30 pmMontreal Pierre Elliott Trudeau Intl
12h 16m
1 stop
STL11:46 pmLambert-St Louis
Apr 25
STL8:03 pmLambert-St Louis
14h 41m
1 stop
YUL11:44 amMontreal Pierre Elliott Trudeau Intl
$350
American Airlines
Apr 20
YUL12:30 pmMontreal Pierre Elliott Trudeau Intl
12h 16m
1 stop
STL11:46 pmLambert-St Louis
Apr 25
STL8:03 pmLambert-St Louis
14h 41m
1 stop
YUL11:44 amMontreal Pierre Elliott Trudeau Intl
$352

momondo Fare Finder

 
Customize your flight search to find flights from Region of 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, momondo users made 832,500 searches. Data last updated febrero 4, 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

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

mié. 3/4

7:10 am-10:27 pm

1 stop16h 17m

Lambert-St Louis

lun. 3/9

4:51 pm-2:20 pm

1 stop20h 29m

$236

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

mié. 3/4

7:10 am-10:27 pm

1 stop16h 17m

Lambert-St Louis

mié. 3/11

11:32 am-11:20 pm

2 stops34h 48m

$257

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

jue. 4/9

5:20 pm-9:08 pm

1 stop4h 48m

Lambert-St Louis

sáb. 4/11

7:45 am-1:59 pm

1 stop5h 14m

$318

OttawaKansas City

YOW - MCI

YOWMCI

Ottawa

lun. 2/23

7:30 pm-10:36 am

2 stops16h 06m

Kansas City

mié. 2/25

11:32 am-9:56 pm

2 stops9h 24m

$319

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

lun. 4/20

12:30 pm-11:46 pm

1 stop12h 16m

Lambert-St Louis

sáb. 4/25

5:21 pm-11:44 am

1 stop17h 23m

$349

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

lun. 4/20

12:30 pm-11:46 pm

1 stop12h 16m

Lambert-St Louis

sáb. 4/25

8:03 pm-11:44 am

1 stop14h 41m

$350

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

dom. 3/1

7:15 am-3:29 pm

1 stop9h 14m

Lambert-St Louis

mié. 3/4

4:05 pm-11:18 pm

1 stop6h 13m

$367

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

dom. 3/1

7:15 am-3:29 pm

1 stop9h 14m

Lambert-St Louis

mié. 3/4

4:05 pm-11:18 pm

1 stop6h 13m

$368

OttawaKansas City

YOW - MCI

YOWMCI

Ottawa

mar. 2/17

5:40 am-5:02 pm

2 stops12h 22m

Kansas City

jue. 2/19

10:41 am-12:39 am

2 stops12h 58m

$427

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

dom. 3/1

5:40 am-4:42 pm

2 stops12h 02m

Lambert-St Louis

mié. 3/4

10:14 am-12:39 am

2 stops13h 25m

$439

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Missouri from

How to get the cheapest flight ticket from Region of Ontario to Missouri

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Missouri?

In general, June is the cheapest month to fly from Region of Ontario to Missouri. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $372. If you aren’t able to travel to Missouri during the month of June, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $395.

What is the cheapest day to depart on your flight to Missouri?

The cheapest day to depart from Region of Ontario to Missouri is on a Sunday when prices can be found for as low as $394. Flights from Region of Ontario to Missouri on a Wednesday will generally be more expensive and average around $496. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Missouri?

According to our data, the cheapest time of day to fly to Missouri is in the morning. momondo users have found flights departing from Region of Ontario to Missouri in the morning for as low as $326. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to Missouri are more costly at noon, with an average ticket price of $446. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Ontario to Missouri flight route?

Fly from Toronto Pearson Intl to Lambert-St Louis for the best Ontario - Missouri flight prices

How far in advance should I book a flight to Missouri?

You are more likely to see cheaper flights to Missouri from Region of Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Missouri for around $471 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Missouri from Region of Ontario for as low as $360 on momondo.

What cabin class options are available on Ontario to Missouri flights?

There are 3 cabin classes available to choose from on Ontario to Missouri flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Region of Ontario to Missouri flights?

You could potentially save up to 41% on your flight if you consider stops on a Region of Ontario to Missouri flight.

Cheap Region of Ontario to Missouri flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Region of Ontario to Missouri

Best Price Found

$394

Fastest flight time

2h 09m

Direct flights

Every day

Airports in Missouri

55 airports
The best flight deal from Region of Ontario to Missouri found on momondo in the last 72 hours is $394
The fastest flight from Region of Ontario to Missouri takes 2h 09m
Direct flights go from Region of Ontario to Missouri every day.
There are 55 airports in Missouri. From Region of Ontario there are direct flights to Lambert-St Louis (STL).
Search flight deals

  • When did momondo last update prices for flights from Ontario to Missouri?

    Prices for flights from Ontario to Missouri were last updated today.

  • How many operators does momondo search for flights from Ontario to Missouri?

  • How old do you have to be to fly from Ontario to Missouri?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario to Missouri.

  • What documentation or ID do you need to fly to Missouri?

    The required travel and health documents for your Missouri trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Missouri. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from Region of Ontario to Missouri?

Best airlines flying from Region of Ontario to Missouri

Compare and see reviews for airlines that fly from Region of Ontario to Missouri with momondo
Airline
Rating
Free Cancellation
Price
Air CanadaPriceFrom $323Free CancellationRating
7.1
10,688 reviews
Search Air Canada flights
American AirlinesPriceFrom $421Free CancellationRating
7.2
11,222 reviews
Search American Airlines flights
United AirlinesPriceFrom $428Free CancellationRating
7.4
9,236 reviews
Search United Airlines flights
DeltaPriceFrom $443Free CancellationRating
7.9
8,146 reviews
Search Delta flights
WestJetPriceFrom $589Free CancellationRating
7.2
3,255 reviews
Search WestJet flights

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Missouri?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Ontario to Missouri. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Ontario to Missouri with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Missouri from Ontario with this policy.

How can momondo help me find flights from Ontario to Missouri?

momondo helps you find the best flight between Ontario and Missouri by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Ontario to Missouri right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Missouri, momondo offers a useful price alert feature which will track prices for flights to Missouri from Ontario and alert you when they change.

An easier way to manage your Missouri trip

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