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Missouri

$72+ 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 7/24. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — STL
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
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 3, 2025.

Round-trip from

$173
(Priceline)

One-way from

$72
(Priceline)

Popular in

February

Cheapest in

August

Average price

$279
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. 8% potential increase in price ($28 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 3, 2025.

This Priceline deal was found by Cheapflights users on 7/1. 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 Priceline 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 7/1$151
This Priceline deal was found by Cheapflights users on 7/1. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/46:00 amONT - STL
1 stop5h 42mFrontier
Sat 7/57:29 pmSTL - ONT
1 stop6h 21mFrontier
Deal found 7/1$172
This Alaska Airlines deal was found by Cheapflights users on 7/2. 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 9/43:06 pmONT - MCI
1 stop6h 53mAlaska Airlines
Mon 9/84:55 pmMCI - ONT
1 stop8h 59mAlaska Airlines
Deal found 7/2$204
This Southwest deal was found by Cheapflights users on 7/1. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/153:30 pmONT - MCI
1 stop6h 35mSouthwest
Wed 9/173:05 pmMCI - ONT
2 stops7h 40mSouthwest
Deal found 7/1$210
This American Airlines deal was found by Cheapflights users on 6/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/2812:59 amONT - MCI
1 stop6h 54mAmerican Airlines
Tue 8/55:49 pmMCI - ONT
1 stop6h 45mAmerican Airlines
Deal found 6/30$247
This Delta deal was found by Cheapflights users on 7/2. 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 7/2$269
This Delta deal was found by Cheapflights users on 7/1. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/315:09 pmONT - MCI
1 stop5h 12mDelta
Mon 8/46:40 amMCI - ONT
1 stop7h 34mDelta
Deal found 7/1$273
This American Airlines deal was found by Cheapflights users on 7/2. 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 10/1411:59 pmONT - SGF
1 stop7h 37mAmerican Airlines
Tue 10/215:00 amSGF - ONT
2 stops9h 01mAmerican Airlines
Deal found 7/2$274
This Hawaiian Airlines deal was found by Cheapflights users on 7/1. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/142:21 pmONT - MCI
1 stop7h 14mHawaiian Airlines
Sat 8/166:45 amMCI - ONT
1 stop10h 01mHawaiian Airlines
Deal found 7/1$284
This Alaska Airlines deal was found by Cheapflights users on 7/1. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/37:47 pmONT - SGF
2 stops11h 52mAlaska Airlines
Wed 10/88:23 amSGF - ONT
2 stops12h 10mAlaska Airlines
Deal found 7/1$359
This United Airlines deal was found by Cheapflights users on 7/3. 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.
Mon 8/116:00 amONT - SGF
1 stop8h 16mUnited Airlines
Thu 9/111:47 pmSGF - ONT
1 stop5h 42mUnited Airlines
Deal found 7/3$374
This American Airlines deal was found by Cheapflights users on 6/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/296:15 amONT - COU
2 stops12h 30mAmerican Airlines
Tue 8/55:15 pmCOU - ONT
1 stop7h 19mAmerican Airlines
Deal found 6/30$466

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 3, 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

Fri 9/5

8:59 pm-9:06 am

1 stop10h 07m

Lambert-St Louis

Sun 9/7

10:39 am-3:24 pm

1 stop6h 45m

$173

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

Tue 7/22

5:21 pm-6:23 pm

1 stop23h 02m

Kansas City

Wed 8/6

7:20 pm-11:50 pm

1 stop6h 30m

$202

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

Mon 8/25

3:04 pm-11:59 pm

1 stop6h 55m

Kansas City

Thu 8/28

4:55 pm-11:53 pm

1 stop8h 58m

$204

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

Tue 9/9

8:15 am-6:05 pm

2 stops7h 50m

Kansas City

Thu 9/18

7:55 pm-10:55 pm

1 stop5h 00m

$210

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

Mon 7/28

12:59 am-9:53 am

1 stop6h 54m

Kansas City

Tue 8/5

5:49 pm-10:34 pm

1 stop6h 45m

$247

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

$269

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

Thu 7/31

5:09 pm-12:21 am

1 stop5h 12m

Kansas City

Thu 8/7

6:40 am-12:14 pm

1 stop7h 34m

$273

OntarioSpringfield

ONT - SGF

ONTSGF

Ontario

Tue 10/14

11:59 pm-9:36 am

1 stop7h 37m

Springfield-Branson

Tue 10/21

5:00 am-12:01 pm

2 stops9h 01m

$274

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

Thu 8/14

2:21 pm-11:35 pm

1 stop7h 14m

Kansas City

Sat 8/16

6:45 am-2:46 pm

1 stop10h 01m

$284

OntarioSpringfield

ONT - SGF

ONTSGF

Ontario

Mon 8/11

6:00 am-4:16 pm

1 stop8h 16m

Springfield-Branson

Fri 8/22

2:55 pm-9:25 pm

1 stop8h 30m

$349

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/3

Showing 1-10 of 27 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 3, 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.

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 3, 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

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Entertainment

7.1

Overall

8.0

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

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Entertainment

7.1

Overall

8.0

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
4,266 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Entertainment

7.1

Overall

8.0

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
7,982 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Entertainment

7.1

Overall

8.0

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
2,545 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Entertainment

7.1

Overall

8.0

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
8,861 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Entertainment

7.1

Overall

8.0

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 Frontier. According to our data, you can fly for as low as $72. Users have also found prices from $102 and $129 on Alaska Airlines and Delta, 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 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$115Average$229FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$263Average$453FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$268Average$504FlexibilityNo cancel feeOn-time71%
DeltaCheapest$284Average$380FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$324Average$433FlexibilityNo cancel feeOn-time63%

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