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Missouri

$75+ 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 3/25. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — STL
Mar 8 — Mar 151
Sat 3/8
Sat 3/15
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 March 3, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$150
(Frontier)

One-way from

$75
(Frontier)

Popular in

January

Cheapest in

August

Average price

$158
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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. 32% potential increase in price ($153 potential increase over avg. RT price).
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Cheapest flight prices on average. 15% potential price decrease ($43 potential savings vs. average RT price).
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Average for round-trip flights in March 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 March 3, 2025.

This CheapOair deal was found by Cheapflights users on 3/2. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2912:10 pmONT - STL
1 stop19h 51mFrontier
Wed 4/306:58 pmSTL - ONT
1 stop18h 28mFrontier
Deal found 3/2$150
This CheapOair deal was found by Cheapflights users on 3/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/163:17 pmONT - MCI
1 stop17h 57mFrontier
Mon 4/218:35 pmMCI - ONT
1 stop5h 24mFrontier
Deal found 3/3$160
This American Airlines deal was found by Cheapflights users on 3/2. 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.
Mon 4/711:59 pmONT - SGF
1 stop6h 41mAmerican Airlines
Sat 4/125:30 amSGF - ONT
1 stop6h 24mAmerican Airlines
Deal found 3/2$269
This Orbitz deal was found by Cheapflights users on 3/2. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/810:18 amONT - STL
2 stops11h 41mMultiple Airlines
Fri 4/116:51 pmSTL - ONT
1 stop7h 08mMultiple Airlines
Deal found 3/2$278
This Delta deal was found by Cheapflights users on 3/2. 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.
Thu 9/412:00 pmONT - SGF
1 stop7h 35mDelta
Tue 9/93:35 pmSGF - ONT
1 stop8h 54mDelta
Deal found 3/2$294
This Delta deal was found by Cheapflights users on 3/2. 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.
Thu 4/36:00 amONT - MCI
1 stop5h 15mDelta
Wed 4/96:10 pmMCI - ONT
1 stop7h 42mDelta
Deal found 3/2$323
This American Airlines deal was found by Cheapflights users on 3/2. 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 4/14:30 pmONT - STL
1 stop5h 28mAmerican Airlines
Tue 4/292:24 pmSTL - ONT
1 stop6h 03mAmerican Airlines
Deal found 3/2$328
This Delta deal was found by Cheapflights users on 3/3. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/175:15 pmONT - STL
1 stop5h 17mDelta
Mon 3/247:30 pmSTL - ONT
1 stop6h 26mDelta
Deal found 3/3$329
This American Airlines deal was found by Cheapflights users on 3/2. 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 3/2510:27 pmONT - MCI
1 stop10h 57mAmerican Airlines
Sat 3/295:18 amMCI - ONT
2 stops8h 41mAmerican Airlines
Deal found 3/2$335
This United Airlines deal was found by Cheapflights users on 3/2. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/186:10 amONT - SGF
1 stop8h 10mUnited Airlines
Wed 4/233:01 pmSGF - ONT
1 stop8h 57mUnited Airlines
Deal found 3/2$354
This Alaska Airlines deal was found by Cheapflights users on 3/3. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2311:46 amONT - MCI
1 stop10h 13mAlaska Airlines
Tue 4/292:59 pmMCI - ONT
1 stop7h 30mAlaska Airlines
Deal found 3/3$354
This Southwest deal was found by Cheapflights users on 3/2. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/245:20 pmONT - STL
1 stop5h 35mSouthwest
Wed 3/2610:25 amSTL - ONT
2 stops8h 40mSouthwest
Deal found 3/2$361

Find flights from Ontario to Missouri within your budget

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 3, 2025.

Fly from

Ontario

Fly to

Missouri

Route

Depart

Return

Price

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

Tue 4/29

12:10 pm-10:01 am

1 stop19h 51m

Lambert-St Louis

Wed 4/30

6:58 pm-11:26 am

1 stop18h 28m

$150

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

Wed 4/16

3:17 pm-11:14 am

1 stop17h 57m

Kansas City

Mon 4/21

8:35 pm-11:59 pm

1 stop5h 24m

$160

OntarioSpringfield

ONT - SGF

ONTSGF

Ontario

Mon 4/7

11:59 pm-8:40 am

1 stop6h 41m

Springfield-Branson

Sat 4/12

5:30 am-9:54 am

1 stop6h 24m

$269

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

Tue 4/8

10:18 am-11:59 pm

2 stops11h 41m

Lambert-St Louis

Fri 4/11

6:51 pm-11:59 pm

1 stop7h 08m

$278

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

Thu 4/3

6:00 am-1:15 pm

1 stop5h 15m

Kansas City

Wed 4/9

6:10 pm-11:52 pm

1 stop7h 42m

$323

OntarioSpringfield

ONT - SGF

ONTSGF

Ontario

Sun 4/6

12:42 pm-10:11 pm

1 stop7h 29m

Springfield-Branson

Mon 4/14

3:30 pm-10:36 pm

1 stop9h 06m

$324

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

Tue 4/1

4:30 pm-11:58 pm

1 stop5h 28m

Lambert-St Louis

Tue 4/29

2:24 pm-6:27 pm

1 stop6h 03m

$328

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

Mon 3/17

5:15 pm-12:32 am

1 stop5h 17m

Lambert-St Louis

Mon 3/24

7:30 pm-11:56 pm

1 stop6h 26m

$329

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

Tue 3/25

10:27 pm-11:24 am

1 stop10h 57m

Kansas City

Sat 3/29

5:18 am-11:59 am

2 stops8h 41m

$335

OntarioSpringfield

ONT - SGF

ONTSGF

Ontario

Fri 4/18

6:10 am-4:20 pm

1 stop8h 10m

Springfield-Branson

Wed 4/23

3:01 pm-9:58 pm

1 stop8h 57m

$354

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/2

Showing 1-10 of 38 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.

Travel insights for flights from Ontario to Missouri

Get recent, data-driven insights about flights from Ontario to Missouri including ideal travel times, pricing trends, and more.

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 March 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.

Rainfall in Missouri by month

Plan your trip to Missouri by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Missouri ranges from 1.1 - 5.2 inches per month. May is typically the wettest month, when rainfall can reach 5.2 in. January is typically the driest time to visit Missouri when rainfall is around 1.1 in.

Temperature in Missouri by month

Plan your trip to Missouri by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Missouri, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 28.4 F).

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 3, 2025.
Read reviews from past customers who have flown Southwest, Alaska Airlines and Delta from Ontario to Missouri. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,333 reviews

Boarding

8.2

Entertainment

7.6

Comfort

8.1

Food

7.1

Overall

8.1

Crew

8.7

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Southwest
8.1
Very good
4,333 reviews
Southwest
8.1
Very good
4,333 reviews

Boarding

8.2

Entertainment

7.6

Comfort

8.1

Food

7.1

Overall

8.1

Crew

8.7

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Alaska Airlines
8.0
Very good
9,710 reviews
Southwest
8.1
Very good
4,333 reviews

Boarding

8.2

Entertainment

7.6

Comfort

8.1

Food

7.1

Overall

8.1

Crew

8.7

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Delta
8.0
Very good
8,068 reviews
Southwest
8.1
Very good
4,333 reviews

Boarding

8.2

Entertainment

7.6

Comfort

8.1

Food

7.1

Overall

8.1

Crew

8.7

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Hawaiian Airlines
7.9
Good
2,319 reviews
Southwest
8.1
Very good
4,333 reviews

Boarding

8.2

Entertainment

7.6

Comfort

8.1

Food

7.1

Overall

8.1

Crew

8.7

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

United Airlines
7.4
Good
8,679 reviews
Southwest
8.1
Very good
4,333 reviews

Boarding

8.2

Entertainment

7.6

Comfort

8.1

Food

7.1

Overall

8.1

Crew

8.7

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

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 $75. Users have also found prices from $162 and $163 on Hawaiian Airlines and Delta, respectively.

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

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

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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 6 airlines flying from Ontario to Missouri

Discover the top 6 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 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$83Average$176FlexibilityNo cancel feeOn-time65%
FrontierCheapest$110Average$201FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$266Average$450FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$268Average$569FlexibilityNo cancel feeOn-time71%
DeltaCheapest$277Average$401FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$322Average$421FlexibilityNo cancel feeOn-time63%
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