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$55+ 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 2/11. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — STL
feb. 4 — feb. 111
mar. 2/4
mar. 2/11
1 adult, Economy
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Cheap flight deals from Ontario to Missouri

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Missouri (USMO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated enero 30, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$110
(Frontier)

One-way from

$55
(Frontier)

Popular in

January

Cheapest in

August

Average price

$598
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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. 25% potential increase in price ($106 potential increase over avg. RT price).
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Cheapest flight prices on average. 9% potential price decrease ($27 potential savings vs. average RT price).
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Average for round-trip flights in January 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 enero 30, 2025.

This Frontier deal was found by Cheapflights users on 1/29. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 2/2010:24 amONT - STL
1 stop9h 44mFrontier
sáb. 3/17:04 pmSTL - ONT
1 stop7h 05mFrontier
Deal found 1/29$110
This Mytrip deal was found by Cheapflights users on 1/29. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 2/1112:59 amONT - MCI
1 stop16h 36mFrontier
mié. 2/198:35 pmMCI - ONT
1 stop5h 31mFrontier
Deal found 1/29$116
This Expedia deal was found by Cheapflights users on 1/30. 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.
mié. 4/2311:46 amONT - MCI
1 stop10h 13mMultiple Airlines
sáb. 4/262:14 pmMCI - ONT
1 stop11h 45mMultiple Airlines
Deal found 1/30$233
This American Airlines deal was found by Cheapflights users on 1/30. 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.
lun. 4/711:59 pmONT - SGF
1 stop6h 38mAmerican Airlines
sáb. 4/125:30 amSGF - ONT
1 stop6h 24mAmerican Airlines
Deal found 1/30$269
This Delta deal was found by Cheapflights users on 1/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 2/205:10 pmONT - MCI
1 stop5h 14mDelta
jue. 2/277:00 amMCI - ONT
1 stop7h 24mDelta
Deal found 1/30$335
This American Airlines deal was found by Cheapflights users on 1/30. 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.
jue. 2/2710:05 amONT - MCI
1 stop5h 07mAmerican Airlines
jue. 3/65:18 amMCI - ONT
2 stops8h 46mAmerican Airlines
Deal found 1/30$340
This Travelocity deal was found by Cheapflights users on 1/30. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 2/217:00 amONT - STL
2 stops14h 59mMultiple Airlines
lun. 2/247:04 pmSTL - ONT
1 stop6h 55mMultiple Airlines
Deal found 1/30$342
This Delta deal was found by Cheapflights users on 1/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 2/261:05 pmONT - STL
1 stop8h 31mDelta
lun. 3/37:40 amSTL - ONT
1 stop6h 44mDelta
Deal found 1/29$343
This American Airlines deal was found by Cheapflights users on 1/30. 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.
mar. 3/412:50 pmONT - STL
2 stops7h 53mAmerican Airlines
jue. 3/65:37 pmSTL - ONT
1 stop8h 16mAmerican Airlines
Deal found 1/30$348
This United Airlines deal was found by Cheapflights users on 1/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 5/31:20 pmONT - SGF
1 stop6h 14mUnited Airlines
vie. 5/95:45 amSGF - ONT
2 stops10h 40mUnited Airlines
Deal found 1/30$353
This Alaska Airlines deal was found by Cheapflights users on 1/30. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 3/611:57 amONT - MCI
1 stop10h 02mAlaska Airlines
lun. 3/102:56 pmMCI - ONT
1 stop10h 28mAlaska Airlines
Deal found 1/30$359
This Southwest deal was found by Cheapflights users on 1/30. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 2/2610:55 amONT - MCI
1 stop5h 35mSouthwest
sáb. 3/16:30 amMCI - ONT
2 stops7h 50mSouthwest
Deal found 1/30$381

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 enero 30, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

jue. 2/20

10:24 am-10:08 pm

1 stop9h 44m

Lambert-St Louis

sáb. 3/1

7:04 pm-12:09 am

1 stop7h 05m

$110

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

mar. 2/11

12:59 am-7:35 pm

1 stop16h 36m

Kansas City

mié. 2/19

8:35 pm-12:06 am

1 stop5h 31m

$116

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

mié. 4/23

11:46 am-11:59 pm

1 stop10h 13m

Kansas City

sáb. 4/26

2:14 pm-11:59 pm

1 stop11h 45m

$233

OntarioSpringfield

ONT - SGF

ONTSGF

Ontario

lun. 4/7

11:59 pm-8:37 am

1 stop6h 38m

Springfield-Branson

sáb. 4/12

5:30 am-9:54 am

1 stop6h 24m

$269

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

jue. 2/20

5:10 pm-12:24 am

1 stop5h 14m

Kansas City

jue. 2/27

7:00 am-12:24 pm

1 stop7h 24m

$335

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

jue. 2/27

10:05 am-5:12 pm

1 stop5h 07m

Kansas City

jue. 3/6

5:18 am-12:04 pm

2 stops8h 46m

$340

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

vie. 2/21

7:00 am-11:59 pm

2 stops14h 59m

Lambert-St Louis

lun. 2/24

7:04 pm-11:59 pm

1 stop6h 55m

$342

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

mié. 2/26

1:05 pm-11:36 pm

1 stop8h 31m

Lambert-St Louis

jue. 2/27

7:40 am-12:24 pm

1 stop6h 44m

$343

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

mar. 3/4

12:50 pm-10:43 pm

2 stops7h 53m

Lambert-St Louis

jue. 3/6

5:37 pm-11:53 pm

1 stop8h 16m

$348

OntarioSpringfield

ONT - SGF

ONTSGF

Ontario

sáb. 5/3

1:20 pm-9:34 pm

1 stop6h 14m

Springfield-Branson

vie. 5/9

5:45 am-2:25 pm

2 stops10h 40m

$353

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/29

Showing 1-10 of 34 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 enero 30, 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 enero 30, 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
4,585 reviews

Overall

8.1

Boarding

8.2

Food

7.1

Comfort

8.1

Entertainment

7.7

Crew

8.7

Reviews

1 / 20

10.0
Excellent

Arlene,May 2024

SAN - OAK

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Southwest
8.1
Very good
4,585 reviews
Southwest
8.1
Very good
4,585 reviews

Overall

8.1

Boarding

8.2

Food

7.1

Comfort

8.1

Entertainment

7.7

Crew

8.7

Reviews

1 / 20

10.0
Excellent

Arlene,May 2024

SAN - OAK

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Alaska Airlines
8.0
Very good
9,686 reviews
Southwest
8.1
Very good
4,585 reviews

Overall

8.1

Boarding

8.2

Food

7.1

Comfort

8.1

Entertainment

7.7

Crew

8.7

Reviews

1 / 20

10.0
Excellent

Arlene,May 2024

SAN - OAK

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Delta
8.0
Very good
8,450 reviews
Southwest
8.1
Very good
4,585 reviews

Overall

8.1

Boarding

8.2

Food

7.1

Comfort

8.1

Entertainment

7.7

Crew

8.7

Reviews

1 / 20

10.0
Excellent

Arlene,May 2024

SAN - OAK

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

United Airlines
7.4
Good
8,906 reviews
Southwest
8.1
Very good
4,585 reviews

Overall

8.1

Boarding

8.2

Food

7.1

Comfort

8.1

Entertainment

7.7

Crew

8.7

Reviews

1 / 20

10.0
Excellent

Arlene,May 2024

SAN - OAK

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,585 reviews

Overall

8.1

Boarding

8.2

Food

7.1

Comfort

8.1

Entertainment

7.7

Crew

8.7

Reviews

1 / 20

10.0
Excellent

Arlene,May 2024

SAN - OAK

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

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 $55. Users have also found prices from $168 and $171 on Delta and Alaska Airlines, 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.

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 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 enero 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$97Average$174FlexibilityNo cancel feeOn-time65%
FrontierCheapest$102Average$201FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$266Average$475FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$268Average$573FlexibilityNo cancel feeOn-time71%
DeltaCheapest$277Average$415FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$314Average$415FlexibilityNo cancel feeOn-time63%
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