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$75+ Cheap flights from Missouri to Ontario (ONT)

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 4/16. Fares are subject to change and may not be available on all flights or dates of travel.
STL — ONT
Mar 8 — Mar 151
Sat 3/8
Sat 3/15
1 adult, Economy
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Cheap flight deals from Missouri to Ontario

Keep the following information in mind while searching for Missouri to Ontario 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
(CheapOair)

Popular in

March

Cheapest in

October

Average price

$429
Provider with most accurate pricing for Kansas City Downtown-Los Angeles flight deals.
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From Missouri to Ontario
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One-way flight from Missouri to Ontario
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Highest demand for flights based on searches. 23% potential increase in price ($75 potential increase over avg. RT price).
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Cheapest flight prices on average. 7% potential price decrease ($19 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 Missouri to Ontario

Cheapest flights from Missouri to Ontario
Explore the most affordable flight options available from Missouri to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 3, 2025.

This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/197:03 pmSTL - ONT
1 stop7h 01mFrontier
Tue 3/2512:59 amONT - STL
1 stop6h 17mFrontier
Deal found 3/3$150
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.
Thu 5/18:41 pmMCI - ONT
1 stop5h 18mFrontier
Mon 5/512:16 pmONT - MCI
1 stop5h 35mFrontier
Deal found 3/2$170
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 4/88:18 amSGF - ONT
1 stop7h 31mAmerican Airlines
Fri 4/1811:59 pmONT - SGF
1 stop6h 41mAmerican Airlines
Deal found 3/2$269
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.
Thu 3/276:14 pmMCI - ONT
1 stop7h 42mDelta
Thu 4/36:00 amONT - MCI
1 stop5h 15mDelta
Deal found 3/3$320
This Orbitz 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/76:53 pmSTL - ONT
1 stop7h 06mMultiple Airlines
Fri 5/96:24 pmONT - STL
2 stops12h 35mMultiple Airlines
Deal found 3/3$326
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.
Tue 4/83:01 pmSGF - ONT
1 stop8h 57mUnited Airlines
Wed 4/165:00 amONT - SGF
1 stop5h 47mUnited Airlines
Deal found 3/2$329
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.
Mon 4/145:32 pmSTL - ONT
1 stop7h 04mDelta
Thu 4/175:15 pmONT - STL
1 stop5h 27mDelta
Deal found 3/2$331
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/55:07 amMCI - ONT
2 stops8h 52mAmerican Airlines
Wed 4/94:35 pmONT - MCI
1 stop5h 01mAmerican Airlines
Deal found 3/3$335
This Southwest deal was found by Cheapflights users on 3/1. 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.
Thu 5/295:35 amSTL - ONT
1 stop7h 30mSouthwest
Tue 6/109:00 amONT - STL
2 stops7h 25mSouthwest
Deal found 3/1$336
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/78:09 amSTL - ONT
1 stop5h 41mAmerican Airlines
Sat 5/1010:00 amONT - STL
2 stops7h 29mAmerican Airlines
Deal found 3/3$342
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 4/167:00 amMCI - ONT
1 stop13h 23mAlaska Airlines
Wed 4/2311:46 amONT - MCI
1 stop10h 13mAlaska Airlines
Deal found 3/3$383
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/57:45 amMCI - ONT
2 stops12h 11mUnited Airlines
Wed 4/91:20 pmONT - MCI
2 stops8h 24mUnited Airlines
Deal found 3/3$398

Find flights from Missouri to Ontario within your budget

Customize your flight search to find flights from Missouri to Ontario 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

Missouri

Fly to

Ontario

Route

Depart

Return

Price

St. LouisOntario

STL - ONT

STLONT

Lambert-St Louis

Wed 3/19

7:03 pm-12:04 am

1 stop7h 01m

Ontario

Tue 3/25

12:59 am-9:16 am

1 stop6h 17m

$150

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Thu 5/1

8:41 pm-11:59 pm

1 stop5h 18m

Ontario

Mon 5/5

12:16 pm-7:51 pm

1 stop5h 35m

$170

SpringfieldOntario

SGF - ONT

SGFONT

Springfield-Branson

Tue 4/8

8:18 am-1:49 pm

1 stop7h 31m

Ontario

Fri 4/18

11:59 pm-8:40 am

1 stop6h 41m

$269

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Thu 3/27

6:14 pm-11:56 pm

1 stop7h 42m

Ontario

Thu 4/3

6:00 am-1:15 pm

1 stop5h 15m

$320

St. LouisOntario

STL - ONT

STLONT

Lambert-St Louis

Wed 5/7

6:53 pm-11:59 pm

1 stop7h 06m

Ontario

Fri 5/9

6:24 pm-8:59 am

2 stops12h 35m

$326

SpringfieldOntario

SGF - ONT

SGFONT

Springfield-Branson

Tue 4/8

3:01 pm-9:58 pm

1 stop8h 57m

Ontario

Wed 4/16

5:00 am-12:47 pm

1 stop5h 47m

$329

St. LouisOntario

STL - ONT

STLONT

Lambert-St Louis

Mon 4/14

5:32 pm-10:36 pm

1 stop7h 04m

Ontario

Thu 4/17

5:15 pm-12:42 am

1 stop5h 27m

$331

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Sat 4/5

5:07 am-11:59 am

2 stops8h 52m

Ontario

Wed 4/9

4:35 pm-11:36 pm

1 stop5h 01m

$335

St. LouisOntario

STL - ONT

STLONT

Lambert-St Louis

Thu 5/29

5:35 am-11:05 am

1 stop7h 30m

Ontario

Tue 6/10

9:00 am-6:25 pm

2 stops7h 25m

$336

St. LouisOntario

STL - ONT

STLONT

Lambert-St Louis

Wed 5/7

8:09 am-11:50 am

1 stop5h 41m

Ontario

Sat 5/10

10:00 am-7:29 pm

2 stops7h 29m

$342

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/3

Showing 1-10 of 34 results
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Best time to book a flight from Missouri to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Missouri 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 Missouri to Ontario

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

What is the cheapest month to book a flight from Missouri to Ontario?

Currently, August is the cheapest month in which you can book a flight from Missouri to Ontario (average of $246). Flying from Missouri to Ontario in March is currently the most expensive (average of $313). 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 MO to ONT?

Find hourly flight availability from Missouri to Ontario. 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 Missouri to Ontario as you normally would.

Rainfall in Ontario by month

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

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

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

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August 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 December, when temperatures are typically at their lowest (around 53.6 F).

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated March 3, 2025.
Read reviews from past customers who have flown Southwest, Alaska Airlines and Delta from Missouri to Ontario. 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

Comfort

8.1

Crew

8.7

Food

7.1

Entertainment

7.6

Overall

8.1

Boarding

8.2

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

Comfort

8.1

Crew

8.7

Food

7.1

Entertainment

7.6

Overall

8.1

Boarding

8.2

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

Comfort

8.1

Crew

8.7

Food

7.1

Entertainment

7.6

Overall

8.1

Boarding

8.2

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

Comfort

8.1

Crew

8.7

Food

7.1

Entertainment

7.6

Overall

8.1

Boarding

8.2

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

Comfort

8.1

Crew

8.7

Food

7.1

Entertainment

7.6

Overall

8.1

Boarding

8.2

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

Comfort

8.1

Crew

8.7

Food

7.1

Entertainment

7.6

Overall

8.1

Boarding

8.2

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 Missouri to Ontario. 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 into for flights to Ontario from Missouri?

    For a flight from Missouri to Ontario, you will be flying into Ontario. Ontario (ONT) is just 3.1 mi from the center of the city.

  • What are the cheapest airlines to fly from Missouri to Ontario 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 American Airlines, respectively.

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

    When deciding which route to take from Missouri to Ontario consider Kansas City - Ontario, Lambert-St Louis - Ontario or Springfield-Branson - Ontario as they are the most popular.

  • Can I find deals for flights from Missouri to Ontario that include hotel bookings?

    Yes. In addition to deals on Missouri to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Missouri to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Missouri to Ontario.

  • Can I find deals for business class flights from Missouri to Ontario?

    Yes. Cheapflights offers flight deals from Missouri to Ontario 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 Missouri to Ontario?

    Currently, August is the cheapest month in which you can book a flight from Missouri to Ontario (average of $246). Flying from Missouri to Ontario in March is currently the most expensive (average of $313). 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 Missouri to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Missouri to Ontario

Discover the top 6 airlines that operate flights from Missouri to Ontario. 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$98Average$170FlexibilityNo cancel feeOn-time65%
FrontierCheapest$107Average$198FlexibilityNo cancel feeOn-time62%
DeltaCheapest$171Average$381FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$268Average$419FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$294Average$452FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$326Average$417FlexibilityNo cancel feeOn-time63%
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