Missouri

$80+ Cheap flights from Ontario (ONT) to Missouri

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 5/26. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — STL
Apr 28 — May 51
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Cheap 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 March 29, 2026.

This Expedia deal was found by Cheapflights users on 3/24. 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.
Fri 4/175:33 pm
ONT
-
STL
1 stop23h 59m
Frontier
Fri 4/249:58 pm
STL
-
ONT
1 stop22h 51m
Frontier
Deal found 3/24$160
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/66:00 am
ONT
-
MCI
1 stop5h 49m
Frontier
Sat 5/92:34 pm
MCI
-
ONT
1 stop11h 15m
Frontier
Deal found 3/27$160
This Frontier deal was found by Cheapflights users on 3/24. 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.
Mon 5/48:59 pm
ONT
-
STL
1 stop19h 07m
Frontier
Mon 5/119:18 pm
STL
-
ONT
1 stop24h 14m
Frontier
Deal found 3/24$162
This Kiwi.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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/36:00 am
ONT
-
MCI
1 stop5h 49m
Frontier
Tue 6/91:45 pm
MCI
-
ONT
1 stop12h 04m
Frontier
Deal found 3/27$164
This Booking.com deal was found by Cheapflights users on 3/25. 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.
Thu 4/2311:47 am
ONT
-
STL
1 stop7h 13m
Frontier
Sun 4/269:55 pm
STL
-
ONT
1 stop12h 29m
Frontier
Deal found 3/25$167
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/64:39 pm
ONT
-
STL
1 stop16h 42m
Frontier
Fri 5/89:18 pm
STL
-
ONT
1 stop19h 51m
Frontier
Deal found 3/27$171
This Booking.com deal was found by Cheapflights users on 3/25. 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.
Wed 4/227:44 pm
ONT
-
STL
1 stop23h 16m
Frontier
Mon 4/279:55 pm
STL
-
ONT
1 stop14h 49m
Frontier
Deal found 3/25$172
This Frontier deal was found by Cheapflights users on 3/26. 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.
Fri 5/86:00 am
ONT
-
STL
1 stop11h 23m
Frontier
Sat 5/98:08 pm
STL
-
ONT
1 stop5h 41m
Frontier
Deal found 3/26$185
This Frontier deal was found by Cheapflights users on 3/24. 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.
Sat 5/212:59 am
ONT
-
MCI
1 stop10h 31m
Frontier
Wed 5/62:34 pm
MCI
-
ONT
1 stop11h 15m
Frontier
Deal found 3/24$185
This Booking.com deal was found by Cheapflights users on 3/24. 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.
Wed 4/297:44 pm
ONT
-
STL
1 stop23h 16m
Frontier
Mon 5/49:55 pm
STL
-
ONT
1 stop23h 37m
Frontier
Deal found 3/24$187
This Booking.com deal was found by Cheapflights users on 3/25. 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.
Mon 5/48:59 pm
ONT
-
STL
1 stop19h 07m
Frontier
Thu 5/78:08 pm
STL
-
ONT
1 stop5h 41m
Frontier
Deal found 3/25$192
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/18:20 pm
ONT
-
STL
1 stop17h 01m
Frontier
Mon 5/48:17 pm
STL
-
ONT
1 stop15h 48m
Frontier
Deal found 3/28$196

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 March 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$160
(Expedia)

One-way from

$80
(Frontier)

Popular in

March

Cheapest in

October

Average price

$483
Provider with most accurate pricing for Los Angeles-Lambert-St Louis flight deals.
Provider most trusted by Cheapflights users for Los Angeles-Lambert-St Louis flights.
From Ontario to Missouri
One-way flight from Ontario to Missouri
Highest demand for flights based on searches. 8% potential increase in price ($37 potential increase over avg. RT price).
Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
Average for round-trip flights in March 2026

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 2,558,603 searches. Data last updated March 29, 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

OntarioSpringfield

ONT - SGF

ONTSGF

Ontario

Wed 5/27

5:45 am-2:18 pm

1 stop6h 33m

Springfield-Branson

Sat 6/6

4:59 pm-9:55 pm

1 stop6h 56m

$335

OntarioColumbia

ONT - COU

ONTCOU

Ontario

Wed 4/22

6:49 pm-10:55 am

2 stops14h 06m

Columbia Regional

Sat 4/25

3:23 pm-10:31 pm

1 stop9h 08m

$344

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

Tue 4/28

6:00 am-1:23 pm

1 stop5h 23m

Lambert-St Louis

Thu 4/30

7:00 am-12:14 pm

1 stop7h 14m

$369

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

Mon 4/20

5:05 pm-12:38 am

1 stop5h 33m

Kansas City

Tue 4/28

5:40 am-11:36 am

1 stop7h 56m

$373

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

Thu 5/14

4:04 pm-8:23 pm

1 stop26h 19m

Lambert-St Louis

Sun 5/17

12:16 pm-7:49 am

1 stop21h 33m

$376

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

Mon 4/20

10:15 pm-8:30 am

1 stop8h 15m

Lambert-St Louis

Sat 4/25

6:00 am-11:36 am

1 stop7h 36m

$376
Quickest round-trip

OntarioColumbia

ONT - COU

ONTCOU

Ontario

Wed 4/8

10:59 am-7:13 pm

1 stop6h 14m

Columbia Regional

Sun 4/12

7:43 pm-11:46 pm

1 stop6h 03m

$388

OntarioColumbia

ONT - COU

ONTCOU

Ontario

Fri 5/1

7:03 pm-10:55 am

2 stops13h 52m

Columbia Regional

Mon 5/4

9:00 am-12:38 pm

1 stop5h 38m

$394

OntarioColumbia

ONT - COU

ONTCOU

Ontario

Fri 5/1

2:08 pm-10:53 pm

1 stop6h 45m

Columbia Regional

Mon 5/4

5:21 pm-11:46 pm

1 stop8h 25m

$398

OntarioSpringfield

ONT - SGF

ONTSGF

Ontario

Thu 5/28

5:00 am-12:52 pm

1 stop5h 52m

Springfield-Branson

Thu 6/4

11:25 am-5:28 pm

1 stop8h 03m

$408

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/29

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

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

Currently, June is the cheapest month in which you can book a flight from Ontario to Missouri (average of $60). Flying from Ontario to Missouri in February is currently the most expensive (average of $158). 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 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 March 29, 2026.
See what other customers who have flown with Southwest,Delta, andUnited Airlines from Ontario to Missouri have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

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 airport do you fly from for flights from Ontario to Missouri?

    Located just 3.1 mi from the city center, Ontario (ONT) is the airport most travelers will use when flying to Missouri from Ontario.

  • How long is the flight from Ontario to Missouri?

    Airlines like United Airlines, American Airlines, and Delta fly from Ontario to Missouri in about 5h 23m. The time it takes to get you to your destination can typically vary by up to 1h 37m. The distance between Ontario and Missouri is about 1541 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $76. Users have also found prices from $118 and $129 on American Airlines and Southwest, respectively.

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

  • 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 Ontario to Missouri?

    Currently, June is the cheapest month in which you can book a flight from Ontario to Missouri (average of $60). Flying from Ontario to Missouri in February is currently the most expensive (average of $158). 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 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 2,558,603 searches. Data last updated March 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$98Average$364FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$115Average$222FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$236Average$474FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$247Average$430FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$268Average$454FlexibilityNo cancel feeOn-time71%

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