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Missouri

$102+ 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 10/14. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — STL
Jul 21 — Jul 281
Mon 7/21
Mon 7/28
1 adult, Economy
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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 July 16, 2025.

Round-trip from

$194
(Priceline)

One-way from

$102
(Alaska Airlines)

Popular in

February

Cheapest in

September

Average price

$269
From Ontario to Missouri
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One-way flight from Ontario to Missouri
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Highest demand for flights based on searches. 9% potential increase in price ($32 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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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 July 16, 2025.

This Priceline deal was found by Cheapflights users on 7/15. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/28:59 pmONT - STL
1 stop10h 07mFrontier
Tue 10/77:52 pmSTL - ONT
1 stop5h 58mFrontier
Deal found 7/15$194
This Alaska Airlines deal was found by Cheapflights users on 7/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/207:10 amONT - MCI
1 stop6h 51mAlaska Airlines
Mon 9/224:55 pmMCI - ONT
1 stop8h 59mAlaska Airlines
Deal found 7/15$204
This Southwest deal was found by Cheapflights users on 7/14. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/205:25 amONT - MCI
1 stop5h 55mSouthwest
Tue 8/266:40 amMCI - ONT
1 stop4h 55mSouthwest
Deal found 7/14$205
This American Airlines deal was found by Cheapflights users on 7/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/206:10 amONT - MCI
2 stops10h 55mAmerican Airlines
Wed 10/17:00 amMCI - ONT
1 stop6h 57mAmerican Airlines
Deal found 7/13$210
This Frontier deal was found by Cheapflights users on 7/14. 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.
Thu 10/910:46 amONT - MCI
1 stop6h 16mFrontier
Mon 10/137:51 pmMCI - ONT
1 stop5h 59mFrontier
Deal found 7/14$226
This Delta deal was found by Cheapflights users on 7/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/274:50 pmONT - MCI
1 stop5h 09mDelta
Wed 9/35:45 amMCI - ONT
1 stop5h 10mDelta
Deal found 7/15$257
This American Airlines deal was found by Cheapflights users on 7/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1911:29 pmONT - SGF
1 stop9h 20mAmerican Airlines
Tue 10/2112:35 pmSGF - ONT
1 stop10h 48mAmerican Airlines
Deal found 7/13$269
This Delta deal was found by Cheapflights users on 7/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1412:00 pmONT - SGF
1 stop8h 32mDelta
Tue 10/213:30 pmSGF - ONT
1 stop9h 11mDelta
Deal found 7/15$279
This Hawaiian Airlines deal was found by Cheapflights users on 7/16. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/311:39 amONT - MCI
1 stop7h 33mHawaiian Airlines
Mon 9/83:37 pmMCI - ONT
1 stop10h 26mHawaiian Airlines
Deal found 7/16$287
This United Airlines deal was found by Cheapflights users on 7/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/207:00 amONT - SGF
1 stop8h 45mUnited Airlines
Sat 8/232:55 pmSGF - ONT
1 stop8h 30mUnited Airlines
Deal found 7/14$349
This Alaska Airlines deal was found by Cheapflights users on 7/14. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/27:47 pmONT - SGF
2 stops11h 52mAlaska Airlines
Tue 10/712:08 pmSGF - ONT
2 stops13h 55mAlaska Airlines
Deal found 7/14$369
This American Airlines deal was found by Cheapflights users on 7/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/2912:55 pmONT - COU
2 stops7h 44mAmerican Airlines
Sat 8/25:15 pmCOU - ONT
1 stop8h 39mAmerican Airlines
Deal found 7/14$482

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 July 16, 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

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

Thu 10/2

8:59 pm-9:06 am

1 stop10h 07m

Lambert-St Louis

Tue 10/7

7:52 pm-11:50 pm

1 stop5h 58m

$194

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

Sat 9/20

7:10 am-4:01 pm

1 stop6h 51m

Kansas City

Wed 10/1

7:00 am-2:12 pm

1 stop9h 12m

$204

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

Wed 8/20

5:25 am-1:20 pm

1 stop5h 55m

Kansas City

Tue 8/26

6:40 am-9:35 am

1 stop4h 55m

$205

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

Sat 9/20

6:10 am-7:05 pm

2 stops10h 55m

Kansas City

Wed 10/1

7:00 am-11:57 am

1 stop6h 57m

$210

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

Thu 10/9

10:46 am-7:02 pm

1 stop6h 16m

Kansas City

Mon 10/13

7:51 pm-11:50 pm

1 stop5h 59m

$226

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

Wed 8/27

4:50 pm-11:59 pm

1 stop5h 09m

Kansas City

Wed 9/3

5:45 am-8:55 am

1 stop5h 10m

$257

OntarioSpringfield

ONT - SGF

ONTSGF

Ontario

Tue 8/19

11:29 pm-10:49 am

1 stop9h 20m

Springfield-Branson

Tue 10/21

12:35 pm-9:23 pm

1 stop10h 48m

$269

OntarioSpringfield

ONT - SGF

ONTSGF

Ontario

Tue 10/14

12:00 pm-10:32 pm

1 stop8h 32m

Springfield-Branson

Tue 10/21

3:30 pm-10:41 pm

1 stop9h 11m

$279

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

Wed 9/3

11:39 am-9:12 pm

1 stop7h 33m

Kansas City

Mon 9/8

3:37 pm-12:03 am

1 stop10h 26m

$287

OntarioSpringfield

ONT - SGF

ONTSGF

Ontario

Wed 8/20

7:00 am-5:45 pm

1 stop8h 45m

Springfield-Branson

Sat 8/23

2:55 pm-9:25 pm

1 stop8h 30m

$349

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/16

Showing 1-10 of 29 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 Ontario to Missouri?

Currently, August is the cheapest month in which you can book a flight from Ontario to Missouri (average of $311). Flying from Ontario to Missouri in March is currently the most expensive (average of $356). 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 ONT 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 July 16, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to Missouri as you normally would.

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 July 16, 2025.
See what other customers who have flown with Alaska Airlines, Southwest, and Delta 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.
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

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

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,241 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

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
7,959 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.8
Good
2,580 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

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
8,863 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

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 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.

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

    For one-way options, check prices for Alaska Airlines. According to our data, you can fly for as low as $102. Users have also found prices from $103 and $105 on American Airlines and Frontier, respectively.

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

    The most popular route from Ontario to Missouri is Ontario - Lambert-St Louis. You may also consider Ontario - Kansas City or Ontario - Springfield-Branson.

  • 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, August is the cheapest month in which you can book a flight from Ontario to Missouri (average of $311). Flying from Ontario to Missouri in March is currently the most expensive (average of $356). 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.
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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 2,558,603 searches. Data last updated July 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$108Average$221FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$263Average$456FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$268Average$502FlexibilityNo cancel feeOn-time71%
DeltaCheapest$284Average$380FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$317Average$431FlexibilityNo cancel feeOn-time63%

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