How long is the flight from Missouri to Ontario?

For as low as $321, Frontier can have you in Ontario from Missouri in 8h 24m. The distance from Missouri to Ontario is about 1372 mi. This flight may include one or multiple stops.

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 $72. Users have also found prices from $118 and $132 on Hawaiian Airlines and Alaska Airlines, respectively.

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.

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).

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.

What are the most popular airlines that fly from Missouri to Ontario?

When booking a flight from Missouri to Ontario, you may want to consider flying on American Airlines, Delta or Frontier as they are the most popular for this route.

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.

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.

$72+ Flights from Missouri to Ontario

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Cheap flight deals from Missouri to Ontario

Round-trip from	$142 (Flightnetwork)
One-way from	$72 (Cheapflightsfares)
Popular in	March
Cheapest in	September
Average price	$206

From Missouri to Ontario

Search Deals

One-way flight from Missouri to Ontario

Search Deals

Highest demand for flights based on searches. 22% potential increase in price ($83 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease ($11 potential savings vs. average RT price).

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Average for round-trip flights in September 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 September 16, 2025.

Fri 10/37:55 pmSTL - ONT

1 stop25h 59mFrontier

Tue 10/77:04 amONT - STL

1 stop24h 03mFrontier

Deal found 9/14

$142

Thu 9/2510:49 amSTL - ONT

1 stop6h 40mFrontier

Sun 10/58:59 pmONT - STL

1 stop10h 07mFrontier

Deal found 9/13

$143

Wed 10/157:02 pmMCI - ONT

1 stop6h 48mFrontier

Wed 10/226:53 amONT - MCI

1 stop9h 02mFrontier

Deal found 9/15

$143

Sat 10/47:55 pmSTL - ONT

1 stop13h 28mFrontier

Tue 10/77:04 amONT - STL

1 stop24h 03mFrontier

Deal found 9/14

$144

Fri 10/33:01 pmMCI - ONT

1 stop6h 53mFrontier

Wed 10/86:53 amONT - MCI

1 stop9h 02mFrontier

Deal found 9/13

$144

Fri 10/249:59 pmSTL - ONT

1 stop24h 43mFrontier

Mon 10/276:53 amONT - STL

1 stop24h 14mFrontier

Deal found 9/14

$145

Fri 10/247:52 pmSTL - ONT

1 stop5h 58mFrontier

Sat 10/258:00 amONT - STL

1 stop5h 56mFrontier

Deal found 9/14

$155

Thu 10/1610:17 amSTL - ONT

1 stop7h 15mFrontier

Sun 10/1910:47 pmONT - STL

1 stop10h 56mFrontier

Deal found 9/14

$156

Thu 10/1610:17 amSTL - ONT

1 stop7h 15mFrontier

Mon 10/206:53 amONT - STL

1 stop24h 14mFrontier

Deal found 9/14

$157

Fri 9/269:35 pmSTL - ONT

1 stop26h 21mFrontier

Sun 9/288:59 pmONT - STL

1 stop10h 07mFrontier

Deal found 9/14

$158

Sat 10/257:02 pmMCI - ONT

1 stop6h 48mFrontier

Thu 10/306:53 amONT - MCI

1 stop10h 40mFrontier

Deal found 9/13

$170

Thu 11/137:45 pmSTL - ONT

1 stop6h 05mFrontier

Mon 11/176:00 amONT - STL

1 stop5h 57mFrontier

Deal found 9/14

$174

Best flights from Missouri to Ontario
Discover carefully curated flight deals from Missouri to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 16, 2025.

Fri 11/79:07 pmSTL - ONT

1 stop25h 35mFrontier

Sun 11/96:53 amONT - STL

1 stop24h 14mFrontier

Deal found 9/15

$143

Tue 10/144:20 pmMCI - ONT

1 stop6h 05mSouthwest

Tue 10/2112:00 pmONT - MCI

1 stop8h 15mSouthwest

Deal found 9/14

$237

Tue 10/146:40 amMCI - ONT

1 stop7h 34mDelta

Tue 10/214:35 pmONT - MCI

1 stop5h 43mDelta

Deal found 9/15

$257

Sat 10/117:52 pmSTL - ONT

1 stop5h 58mFrontier

Sat 10/188:00 amONT - STL

1 stop5h 56mFrontier

Deal found 9/14

$144

Sat 10/111:40 pmSTL - ONT

2 stops11h 12mUnited Airlines

Sat 10/185:05 amONT - STL

1 stop5h 39mUnited Airlines

Deal found 9/15

$298

Sat 11/14:51 pmSTL - ONT

1 stop5h 51mFrontier

Thu 11/66:00 amONT - STL

1 stop5h 57mFrontier

Deal found 9/15

$144

Wed 10/224:18 pmSGF - ONT

1 stop8h 24mAmerican Airlines

Tue 10/2811:59 pmONT - SGF

1 stop7h 39mAmerican Airlines

Deal found 9/14

$321

Fri 10/318:40 pmSTL - ONT

1 stop16h 30mFrontier

Sun 11/25:53 amONT - STL

1 stop24h 14mFrontier

Deal found 9/15

$144

Fri 10/33:01 pmMCI - ONT

1 stop6h 53mFrontier

Wed 10/86:53 amONT - MCI

1 stop9h 02mFrontier

Deal found 9/14

$144

Sat 10/117:02 pmMCI - ONT

1 stop6h 48mFrontier

Sat 11/812:05 pmONT - MCI

1 stop5h 28mFrontier

Deal found 9/15

$144

Fri 9/199:55 pmSGF - ONT

1 stop16h 48mMultiple Airlines

Mon 9/2210:28 pmONT - SGF

2 stops37h 46mMultiple Airlines

Deal found 9/15

$490

Fri 10/178:38 pmMCI - ONT

1 stop5h 12mFrontier

Fri 10/2411:53 amONT - MCI

1 stop28h 02mFrontier

Deal found 9/15

$180

Fri 10/175:15 pmSTL - ONT

1 stop7h 07mDelta

Mon 10/2010:00 pmONT - STL

1 stop8h 05mDelta

Deal found 9/16

$293

Fri 9/263:01 pmMCI - ONT

1 stop6h 53mFrontier

Sat 10/48:59 pmONT - MCI

1 stop14h 49mFrontier

Deal found 9/15

$184

Mon 11/177:47 pmSTL - ONT

1 stop6h 05mDelta

Tue 12/24:49 pmONT - STL

1 stop6h 00mDelta

Deal found 9/15

$305

Sat 11/155:00 pmSTL - ONT

1 stop6h 35mDelta

Wed 12/36:00 amONT - STL

1 stop5h 30mDelta

Deal found 9/15

$305

Thu 11/206:00 pmSGF - ONT

1 stop6h 23mAmerican Airlines

Tue 11/2511:59 pmONT - SGF

1 stop7h 59mAmerican Airlines

Deal found 9/14

$376

Thu 11/138:28 pmMCI - ONT

1 stop5h 22mFrontier

Mon 11/176:53 amONT - MCI

1 stop10h 40mFrontier

Deal found 9/15

$196

Wed 10/156:00 amSGF - ONT

1 stop16h 24mUnited Airlines

Tue 10/214:15 pmONT - SGF

1 stop5h 25mUnited Airlines

Deal found 9/13

$409

Mon 10/138:38 pmMCI - ONT

1 stop5h 12mFrontier

Mon 10/206:53 amONT - MCI

1 stop11h 00mFrontier

Deal found 9/16

$202

Sat 2/288:54 amJLN - ONT

2 stops11h 06mUnited Airlines

Wed 3/45:40 amONT - JLN

2 stops9h 58mUnited Airlines

Deal found 9/14

$414

Fri 10/319:53 pmSGF - ONT

1 stop16h 44mMultiple Airlines

Mon 11/36:53 amONT - SGF

2 stops12h 11mMultiple Airlines

Deal found 9/15

$510

Wed 10/226:00 amSGF - ONT

2 stops8h 13mUnited Airlines

Tue 10/286:38 pmONT - SGF

2 stops14h 13mUnited Airlines

Deal found 9/14

$422

Fri 11/148:28 pmMCI - ONT

1 stop5h 22mFrontier

Sat 11/156:53 amONT - MCI

1 stop10h 40mFrontier

Deal found 9/16

$223

Thu 10/91:47 pmSGF - ONT

1 stop5h 36mUnited Airlines

Mon 10/136:36 pmONT - SGF

2 stops14h 14mUnited Airlines

Deal found 9/14

$454

Thu 10/238:38 pmMCI - ONT

1 stop5h 12mFrontier

Sun 10/266:53 amONT - MCI

1 stop11h 00mFrontier

Deal found 9/15

$234

Thu 10/235:28 pmCOU - ONT

1 stop8h 31mAmerican Airlines

Sun 10/267:27 pmONT - COU

2 stops13h 40mAmerican Airlines

Deal found 9/13

$590

Thu 9/253:05 pmSGF - ONT

1 stop8h 19mUnited Airlines

Sun 9/286:00 amONT - SGF

1 stop6h 00mUnited Airlines

Deal found 9/15

$459

Fri 10/177:52 pmSTL - ONT

1 stop5h 58mFrontier

Sun 10/196:05 amONT - STL

1 stop5h 57mFrontier

Deal found 9/16

$248

Fri 10/245:25 pmCOU - ONT

1 stop7h 17mAmerican Airlines

Sun 10/267:27 pmONT - COU

2 stops13h 40mAmerican Airlines

Deal found 9/13

$590

Last-minute flights from Missouri to Ontario
Discover last-minute flight deals from Missouri to Ontario. Data last updated September 16, 2025 and is based on user searches.

Thu 9/2510:49 amSTL - ONT

1 stop6h 40mFrontier

Sun 10/58:59 pmONT - STL

1 stop10h 07mFrontier

Deal found 9/13

$143

Fri 9/269:35 pmSTL - ONT

1 stop26h 21mFrontier

Sun 9/288:59 pmONT - STL

1 stop10h 07mFrontier

Deal found 9/14

$158

Fri 10/37:55 pmSTL - ONT

1 stop25h 59mFrontier

Tue 10/77:04 amONT - STL

1 stop24h 03mFrontier

Deal found 9/14

$142

Fri 10/33:01 pmMCI - ONT

1 stop6h 53mFrontier

Wed 10/86:53 amONT - MCI

1 stop9h 02mFrontier

Deal found 9/13

$144

Sat 10/47:55 pmSTL - ONT

1 stop13h 28mFrontier

Tue 10/77:04 amONT - STL

1 stop24h 03mFrontier

Deal found 9/14

$144

Sun 10/52:38 pmSTL - ONT

1 stop18h 39mFrontier

Sun 10/126:53 amONT - STL

1 stop24h 14mFrontier

Deal found 9/15

$145

Wed 10/87:02 pmMCI - ONT

1 stop6h 48mFrontier

Sat 10/117:04 amONT - MCI

1 stop8h 51mFrontier

Deal found 9/14

$174

Wed 10/157:02 pmMCI - ONT

1 stop6h 48mFrontier

Wed 10/226:53 amONT - MCI

1 stop9h 02mFrontier

Deal found 9/15

$143

Thu 10/1610:17 amSTL - ONT

1 stop7h 15mFrontier

Sun 10/1910:47 pmONT - STL

1 stop10h 56mFrontier

Deal found 9/14

$156

Thu 10/1610:17 amSTL - ONT

1 stop7h 15mFrontier

Mon 10/206:53 amONT - STL

1 stop24h 14mFrontier

Deal found 9/14

$157

Fri 10/247:52 pmSTL - ONT

1 stop5h 58mFrontier

Sat 10/258:00 amONT - STL

1 stop5h 56mFrontier

Deal found 9/14

$155

Sat 10/257:02 pmMCI - ONT

1 stop6h 48mFrontier

Thu 10/306:53 amONT - MCI

1 stop10h 40mFrontier

Deal found 9/13

$170

One-way flights from Missouri to Ontario
Search for one-way flight options from Missouri to Ontario. Find affordable one-way fares based on user searches. Data last updated September 16, 2025.

Wed 10/157:52 pmSTL - ONT

1 stop5h 58mFrontier

Deal found 9/13

$72

Mon 11/37:45 pmSTL - ONT

1 stop6h 05mFrontier

Deal found 9/15

$73

Wed 10/157:02 pmMCI - ONT

1 stop6h 48mFrontier

Deal found 9/13

$73

Mon 10/2012:38 pmSTL - ONT

1 stop11h 27mFrontier

Deal found 9/13

$78

Fri 10/39:35 pmSTL - ONT

1 stop17h 08mFrontier

Deal found 9/16

$79

Thu 11/67:45 pmSTL - ONT

1 stop6h 05mFrontier

Deal found 9/14

$84

Wed 10/87:02 pmMCI - ONT

1 stop6h 48mFrontier

Deal found 9/14

$84

Thu 10/1610:17 amSTL - ONT

1 stop7h 15mFrontier

Deal found 9/15

$85

Sun 10/510:39 amSTL - ONT

1 stop9h 36mFrontier

Deal found 9/15

$90

Fri 10/179:59 pmSTL - ONT

1 stop16h 38mFrontier

Deal found 9/15

$91

Thu 10/308:40 pmSTL - ONT

1 stop16h 30mFrontier

Deal found 9/15

$95

Fri 12/59:50 pmSTL - ONT

1 stop25h 14mFrontier

Deal found 9/14

$97

Fly from

Fly to

Route

Depart

Return

Price

St. LouisOntario

STL - ONT

STLONT

Lambert-St Louis

Fri 11/7

9:07 pm-8:42 pm

1 stop25h 35m

Ontario

Sun 11/9

6:53 am-9:07 am

1 stop24h 14m

$143

St. LouisOntario

STL - ONT

STLONT

Lambert-St Louis

Sat 10/11

7:52 pm-11:50 pm

1 stop5h 58m

Ontario

Sat 10/18

8:00 am-3:56 pm

1 stop5h 56m

$144

St. LouisOntario

STL - ONT

STLONT

Lambert-St Louis

Sat 11/1

4:51 pm-8:42 pm

1 stop5h 51m

Ontario

Thu 11/6

6:00 am-1:57 pm

1 stop5h 57m

$144

St. LouisOntario

STL - ONT

STLONT

Lambert-St Louis

Fri 10/31

8:40 pm-11:10 am

1 stop16h 30m

Ontario

Sun 11/2

5:53 am-8:07 am

1 stop24h 14m

$144

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Fri 10/3

3:01 pm-7:54 pm

1 stop6h 53m

Ontario

Wed 10/8

6:53 am-5:55 pm

1 stop9h 02m

$144

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Sat 10/11

7:02 pm-11:50 pm

1 stop6h 48m

Ontario

Sat 11/8

12:05 pm-7:33 pm

1 stop5h 28m

$144

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Fri 10/17

8:38 pm-11:50 pm

1 stop5h 12m

Ontario

Fri 10/24

11:53 am-5:55 pm

1 stop28h 02m

$180

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Fri 9/26

3:01 pm-7:54 pm

1 stop6h 53m

Ontario

Sat 10/4

8:59 pm-1:48 pm

1 stop14h 49m

$184

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Thu 11/13

8:28 pm-11:50 pm

1 stop5h 22m

Ontario

Mon 11/17

6:53 am-7:33 pm

1 stop10h 40m

$196

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Mon 10/13

8:38 pm-11:50 pm

1 stop5h 12m

Ontario

Mon 10/20

6:53 am-7:53 pm

1 stop11h 00m

$202

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Showing 1-10 of 60 results

...

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.

Cheapflights Insights

Everything you need to know about your flight from Missouri to Ontario

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 $327). 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?

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.

Related info for your journey

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.
How long is the flight from Missouri to Ontario?
For as low as $321, Frontier can have you in Ontario from Missouri in 8h 24m. The distance from Missouri to Ontario is about 1372 mi. This flight may include one or multiple stops.
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 $72. Users have also found prices from $118 and $132 on Hawaiian Airlines and Alaska 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 $327). 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

Top 5 airlines flying from Missouri to Ontario

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$114	Average$238	FlexibilityNo cancel fee	On-time62%
Delta	Cheapest$181	Average$362	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$264	Average$388	FlexibilityNo cancel fee	On-time71%
United Airlines	Cheapest$284	Average$431	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$290	Average$408	FlexibilityNo cancel fee	On-time63%

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$72+ 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 10/15. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Missouri to Ontario with Cheapflights

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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 September 16, 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Missouri to Ontario

Cheapest flights from Missouri to OntarioExplore 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 September 16, 2025.

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 September 16, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Missouri to Ontario that are best for you.

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.

Cheapflights Insights

Everything you need to know about your flight from Missouri to Ontario

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

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 September 16, 2025.

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?

How long is the flight from Missouri to Ontario?

What are the cheapest airlines to fly from Missouri to Ontario one-way?

What are the most popular routes from Missouri to Ontario?

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

How can I find direct flights from Missouri to Ontario?

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

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

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 Missouri to Ontario

See prices for flight routes from nearby airports that may be better suited for you.

Top 5 airlines flying from Missouri to Ontario

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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 September 16, 2025.