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Ontario

$85+ Cheap flights from Missouri to Ontario (ONT)

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 4/26. Fares are subject to change and may not be available on all flights or dates of travel.
STL — ONT
5月 1 — 5月 81
週五 5/1
週五 5/8
1 adult, Economy
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Cheap flight deals from Missouri to Ontario

Cheapest flights from Missouri to Ontario
Explore the most affordable flight options available from Missouri to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 4月 1, 2026.

This Frontier deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
週四 5/712:16 pm
STL
-
ONT
1 stop9h 16m
Frontier
週日 5/246:00 am
ONT
-
STL
1 stop11h 23m
Frontier
Deal found 4/1$160
This Expedia deal was found by Cheapflights users on 3/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
週六 4/252:51 pm
MCI
-
ONT
1 stop11h 04m
Frontier
週五 5/112:59 am
ONT
-
MCI
1 stop11h 07m
Frontier
Deal found 3/30$160
This Frontier deal was found by Cheapflights users on 3/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
週四 4/309:55 pm
STL
-
ONT
1 stop23h 30m
Frontier
週三 5/64:39 pm
ONT
-
STL
1 stop16h 42m
Frontier
Deal found 3/28$161
This Booking.com deal was found by Cheapflights users on 3/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
週三 5/66:51 pm
STL
-
ONT
1 stop22h 18m
Frontier
週六 5/94:04 pm
ONT
-
STL
1 stop17h 17m
Frontier
Deal found 3/29$162
This Booking.com deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
週六 5/28:17 pm
STL
-
ONT
1 stop13h 09m
Frontier
週六 5/169:15 am
ONT
-
STL
1 stop6h 49m
Frontier
Deal found 3/31$167
This CheapOair deal was found by Cheapflights users on 3/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
週六 5/28:17 pm
STL
-
ONT
1 stop13h 09m
Frontier
週一 5/48:59 pm
ONT
-
STL
1 stop19h 07m
Frontier
Deal found 3/30$171
This Booking.com deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
週四 4/309:55 pm
STL
-
ONT
1 stop12h 09m
Frontier
週四 5/76:00 am
ONT
-
STL
1 stop11h 23m
Frontier
Deal found 3/31$172
This Frontier deal was found by Cheapflights users on 3/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
週二 5/122:34 pm
MCI
-
ONT
1 stop11h 15m
Frontier
週二 5/196:00 am
ONT
-
MCI
1 stop5h 49m
Frontier
Deal found 3/28$183
This Frontier deal was found by Cheapflights users on 3/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
週六 4/252:51 pm
MCI
-
ONT
1 stop11h 04m
Frontier
週六 5/212:59 am
ONT
-
MCI
1 stop10h 31m
Frontier
Deal found 3/30$185
This Frontier deal was found by Cheapflights users on 3/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
週六 5/98:08 pm
STL
-
ONT
1 stop15h 57m
Frontier
週五 5/156:00 am
ONT
-
STL
1 stop11h 23m
Frontier
Deal found 3/30$186
This Booking.com deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
週五 4/249:58 pm
STL
-
ONT
1 stop22h 51m
Frontier
週六 4/2512:59 am
ONT
-
STL
1 stop16h 22m
Frontier
Deal found 3/31$187
This Booking.com deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
週三 5/132:34 pm
MCI
-
ONT
1 stop11h 15m
Frontier
週一 5/1810:50 am
ONT
-
MCI
1 stop24h 59m
Frontier
Deal found 3/27$187

Find flight deals from Missouri to Ontario

Keep the following information in mind while searching for Missouri to Ontario flight deals. Data was last updated 4月 1, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$160
(Frontier)

One-way from

$85
(Super.com)

Popular in

March

Cheapest in

September

Average price

$391
Provider with most accurate pricing for Lambert-St Louis-Los Angeles Los Angeles flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Los Angeles Los Angeles flights.
Search Deals
From Missouri to Ontario
Search Deals
One-way flight from Missouri to Ontario
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($23 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Missouri 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 2,558,603 searches. Data last updated 4月 1, 2026.
Use the filters below to find and compare flights from Missouri to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisOntario

STL - ONT

STLONT

Lambert-St Louis

週三 5/6

6:51 pm-3:09 pm

1 stop22h 18m

Ontario

週五 5/8

8:44 am-8:23 pm

1 stop9h 39m

$171

St. LouisOntario

STL - ONT

STLONT

Lambert-St Louis

週五 5/15

9:18 pm-3:09 pm

1 stop19h 51m

Ontario

週一 5/18

10:50 am-7:23 pm

1 stop6h 33m

$192

St. LouisOntario

STL - ONT

STLONT

Lambert-St Louis

週六 5/30

8:08 pm-11:49 pm

1 stop5h 41m

Ontario

週二 6/2

4:39 pm-6:06 pm

1 stop23h 27m

$221

ColumbiaOntario

COU - ONT

COUONT

Columbia Regional

週三 5/6

3:10 pm-10:35 pm

1 stop9h 25m

Ontario

週六 5/9

1:40 pm-8:49 pm

1 stop5h 09m

$338

ColumbiaOntario

COU - ONT

COUONT

Columbia Regional

週三 4/22

10:16 am-6:30 pm

2 stops10h 14m

Ontario

週六 4/25

12:19 pm-10:53 pm

2 stops8h 34m

$349

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

週三 4/22

2:58 pm-10:32 pm

1 stop9h 34m

Ontario

週三 4/29

7:00 am-4:17 pm

1 stop7h 17m

$357

St. LouisOntario

STL - ONT

STLONT

Lambert-St Louis

週二 4/28

4:49 pm-9:50 pm

1 stop7h 01m

Ontario

週二 5/5

5:00 am-1:13 pm

1 stop6h 13m

$357

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

週二 5/12

9:39 am-6:24 pm

2 stops10h 45m

Ontario

週六 5/16

12:19 pm-10:50 pm

2 stops8h 31m

$368

ColumbiaOntario

COU - ONT

COUONT

Columbia Regional

週三 4/15

3:23 pm-10:31 pm

1 stop9h 08m

Ontario

週六 4/18

1:34 pm-9:03 pm

1 stop5h 29m

$388

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

週三 6/3

6:40 am-12:19 pm

1 stop7h 39m

Ontario

週三 6/3

10:00 pm-9:29 am

1 stop9h 29m

$405

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/28

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

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

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

Currently, November is the cheapest month in which you can book a flight from Missouri to Ontario (average of $67). Flying from Missouri to Ontario in December is currently the most expensive (average of $169). 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.

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

Related info for your journey

Find useful and relevant information for your journey from Missouri 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 into for flights to Ontario from Missouri?

    For a flight from Missouri to Ontario, you will be flying into Ontario. Ontario (ONT) is just 3.1 mi from the center of the city.

  • How long is the flight from Missouri to Ontario?

    For as low as $338, Frontier can have you in Ontario from Missouri in 9h 25m. The distance from Missouri to Ontario is about 1442 mi. This flight may include one or multiple stops.

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

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $79. Users have also found prices from $128 and $142 on American Airlines and Southwest, respectively.

  • What are the most popular routes from Missouri to Ontario?

    When deciding which route to take from Missouri to Ontario consider Kansas City - Ontario, Lambert-St Louis - Ontario or Springfield-Branson - Ontario as they are the most popular.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Missouri 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.

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

    Currently, November is the cheapest month in which you can book a flight from Missouri to Ontario (average of $67). Flying from Missouri to Ontario in December is currently the most expensive (average of $169). 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

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Alternative routes for Missouri to Ontario

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

Discover the top 5 airlines that operate flights from Missouri 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 2,558,603 searches. Data last updated 4月 1, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$128Average$259FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$253Average$437FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$264Average$419FlexibilityNo cancel feeOn-time71%
DeltaCheapest$276Average$431FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$289Average$397FlexibilityNo cancel feeOn-time63%

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