HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Missouri

$68+ 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 4/22. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — STL
abr. 8 — abr. 151
mar. 4/8
mar. 4/15
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Missouri with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 abril 3, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$198
(Trip.com)

One-way from

$68
(Trip.com)

Popular in

February

Cheapest in

May

Average price

$289
Provider with most accurate pricing for Los Angeles-Kansas City flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-Kansas City flights.
Search Deals
From Ontario to Missouri
Search Deals
One-way flight from Ontario to Missouri
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($37 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
Search Deals

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 abril 3, 2025.

This Trip.com deal was found by Cheapflights users on 4/1. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 5/910:52 amONT - STL
1 stop8h 13mFrontier
dom. 5/119:55 pmSTL - ONT
1 stop11h 29mFrontier
Deal found 4/1$198
This Trip.com deal was found by Cheapflights users on 4/2. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 4/2412:59 amONT - MCI
1 stop16h 51mFrontier
dom. 4/278:40 pmMCI - ONT
1 stop5h 19mFrontier
Deal found 4/2$233
This American Airlines deal was found by Cheapflights users on 4/1. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 4/196:00 amONT - SGF
1 stop5h 47mAmerican Airlines
sáb. 5/39:10 amSGF - ONT
1 stop6h 39mAmerican Airlines
Deal found 4/1$239
This Delta deal was found by Cheapflights users on 4/2. 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.
mié. 4/236:00 amONT - MCI
1 stop5h 18mDelta
mié. 4/307:00 amMCI - ONT
1 stop7h 16mDelta
Deal found 4/2$257
This Orbitz deal was found by Cheapflights users on 4/2. 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.
sáb. 4/2612:10 pmONT - MCI
1 stop5h 40mMultiple Airlines
mar. 4/293:59 pmMCI - ONT
1 stop9h 59mMultiple Airlines
Deal found 4/2$272
This American Airlines deal was found by Cheapflights users on 4/2. 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.
sáb. 4/2610:00 amONT - MCI
2 stops9h 50mAmerican Airlines
mar. 4/294:58 pmMCI - ONT
1 stop7h 12mAmerican Airlines
Deal found 4/2$301
This Delta deal was found by Cheapflights users on 4/2. 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.
mié. 4/301:20 pmONT - STL
1 stop5h 43mDelta
mié. 5/72:29 pmSTL - ONT
2 stops10h 06mDelta
Deal found 4/2$306
This Alaska Airlines deal was found by Cheapflights users on 4/2. 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.
jue. 4/2411:46 amONT - MCI
1 stop10h 13mAlaska Airlines
mar. 4/293:59 pmMCI - ONT
1 stop9h 59mAlaska Airlines
Deal found 4/2$315
This American Airlines deal was found by Cheapflights users on 4/2. 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.
mié. 4/3012:50 pmONT - STL
2 stops8h 43mAmerican Airlines
mié. 5/75:19 amSTL - ONT
2 stops8h 31mAmerican Airlines
Deal found 4/2$317
This Expedia deal was found by Cheapflights users on 4/2. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 4/2712:59 amONT - STL
1 stop7h 02mMultiple Airlines
mié. 4/307:35 amSTL - ONT
2 stops14h 54mMultiple Airlines
Deal found 4/2$333
This Hawaiian Airlines deal was found by Cheapflights users on 4/1. 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.
mié. 9/37:10 amONT - MCI
1 stop6h 51mHawaiian Airlines
jue. 9/43:37 pmMCI - ONT
1 stop10h 22mHawaiian Airlines
Deal found 4/1$334
This United Airlines deal was found by Cheapflights users on 4/2. 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.
mié. 4/234:17 pmONT - MCI
1 stop5h 27mUnited Airlines
mié. 4/306:00 amMCI - ONT
2 stops10h 50mUnited Airlines
Deal found 4/2$340

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 abril 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

vie. 5/9

10:52 am-9:05 pm

1 stop8h 13m

Lambert-St Louis

dom. 5/11

9:55 pm-7:24 am

1 stop11h 29m

$198

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

jue. 4/24

12:59 am-7:50 pm

1 stop16h 51m

Kansas City

dom. 4/27

8:40 pm-11:59 pm

1 stop5h 19m

$233

OntarioSpringfield

ONT - SGF

ONTSGF

Ontario

sáb. 4/19

6:00 am-1:47 pm

1 stop5h 47m

Springfield-Branson

sáb. 5/3

9:10 am-1:49 pm

1 stop6h 39m

$239

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

mié. 4/23

6:00 am-1:18 pm

1 stop5h 18m

Kansas City

mié. 4/30

7:00 am-12:16 pm

1 stop7h 16m

$257

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

sáb. 4/26

12:10 pm-7:50 pm

1 stop5h 40m

Kansas City

mar. 4/29

3:59 pm-11:58 pm

1 stop9h 59m

$272

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

sáb. 4/26

10:00 am-9:50 pm

2 stops9h 50m

Kansas City

mar. 4/29

4:58 pm-10:10 pm

1 stop7h 12m

$301

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

mié. 4/30

1:20 pm-9:03 pm

1 stop5h 43m

Lambert-St Louis

mié. 5/7

2:29 pm-10:35 pm

2 stops10h 06m

$306

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

jue. 4/24

11:46 am-11:59 pm

1 stop10h 13m

Kansas City

mar. 4/29

3:59 pm-11:58 pm

1 stop9h 59m

$315

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

mié. 4/30

12:50 pm-11:33 pm

2 stops8h 43m

Lambert-St Louis

mié. 5/7

5:19 am-11:50 am

2 stops8h 31m

$317

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

dom. 4/27

12:59 am-10:01 am

1 stop7h 02m

Lambert-St Louis

mié. 4/30

7:35 am-8:29 pm

2 stops14h 54m

$333

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/1

Showing 1-10 of 40 results
1
2
3
4

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 abril 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 abril 3, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest 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.
Alaska Airlines
8.0
Very good
9,825 reviews

Crew

8.5

Food

7.1

Boarding

8.2

Comfort

7.9

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
9,825 reviews
Alaska Airlines
8.0
Very good
9,825 reviews

Crew

8.5

Food

7.1

Boarding

8.2

Comfort

7.9

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Southwest
8.0
Very good
4,274 reviews
Alaska Airlines
8.0
Very good
9,825 reviews

Crew

8.5

Food

7.1

Boarding

8.2

Comfort

7.9

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,897 reviews
Alaska Airlines
8.0
Very good
9,825 reviews

Crew

8.5

Food

7.1

Boarding

8.2

Comfort

7.9

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Hawaiian Airlines
7.9
Good
2,344 reviews
Alaska Airlines
8.0
Very good
9,825 reviews

Crew

8.5

Food

7.1

Boarding

8.2

Comfort

7.9

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
United Airlines
7.4
Good
8,619 reviews
Alaska Airlines
8.0
Very good
9,825 reviews

Crew

8.5

Food

7.1

Boarding

8.2

Comfort

7.9

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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 $68. Users have also found prices from $127 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Missouri

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to John F Kennedy Intl flights
San Francisco to John F Kennedy Intl flights
Los Angeles to Newark flights
Los Angeles to Honolulu flights
Los Angeles to LaGuardia flights
San Francisco to Newark flights
San Jose to Los Angeles flights
Los Angeles to Seattle flights
Los Angeles to Boston flights
San Francisco to Los Angeles flights
Los Angeles to Las Vegas flights
Los Angeles to Miami flights
Los Angeles to Orlando flights
San Francisco to Las Vegas flights
Los Angeles to San Jose flights
Oakland to Los Angeles flights
Los Angeles to San Francisco flights
San Francisco to LaGuardia flights
San Francisco to Seattle flights
Los Angeles to O'Hare Intl flights
Los Angeles to Reagan-National flights
Santa Ana to Las Vegas flights
Los Angeles to Oakland flights
Los Angeles to Dallas/Fort Worth flights
San Francisco to Honolulu flights
San Francisco to Ontario flights
Burbank to Las Vegas flights
Los Angeles to Dulles Intl flights
Burbank to Newark flights
San Francisco to Boston flights
San Diego to Seattle flights
Oakland to Las Vegas flights
Los Angeles to Portland flights
San Francisco to O'Hare Intl flights
Ontario to John F Kennedy Intl flights
San Francisco to Dulles Intl flights
San Jose to Seattle flights
San Francisco to Miami flights
San Francisco to Dallas/Fort Worth flights
San Jose to Las Vegas flights
Los Angeles to Sky Harbor Intl flights
Los Angeles to Salt Lake City flights
Los Angeles to Fort Lauderdale flights
Ontario to San Francisco flights
Ontario to Seattle flights
Los Angeles to Hobby flights
Ontario to Honolulu flights
Santa Ana to Oakland flights
Santa Ana to Seattle flights
Ontario to Newark flights

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 abril 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$108Average$190FlexibilityNo cancel feeOn-time65%
FrontierCheapest$117Average$204FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$266Average$431FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$268Average$570FlexibilityNo cancel feeOn-time71%
DeltaCheapest$277Average$380FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$317Average$417FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.