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 $105. Users have also found prices from $129 and $153 on Delta and Hawaiian 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.

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.

How far in advance should I book a flight from Missouri to Ontario?

Travelers have found it’s best to book a flight 38 days in advance to save up to 104% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 38 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from Missouri to Ontario 1-2 weeks in advance for as low as $231, or $356 for flights within the next 24 hours.

What is the cheapest month to fly from Missouri to Ontario?

The best pricing can be found in the month of September. Prices to Ontario from Missouri average $269. You can even find prices in September for less than $269, as users have found deals to Ontario from as low as $62. The month of March appears to be one of the more expensive times to travel to Ontario from Missouri. Flying in the targeted month can save you up to 41%.

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.

$105+ Flights from Missouri to Ontario

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Cheap flight deals from Missouri to Ontario

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$208 (Trip.com)
One-way from	$105 (Trip.com)
Popular in	March
Cheapest in	September
Average price	$248

Provider with most accurate pricing for Kansas City-Los Angeles flight deals.

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Provider most trusted by Cheapflights users for Kansas City-Los Angeles flights.

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From Missouri to Ontario

Search Deals

One-way flight from Missouri to Ontario

Search Deals

Highest demand for flights based on searches. 18% potential increase in price ($62 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease ($10 potential savings vs. average RT price).

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Average for round-trip flights in April 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 April 3, 2025.

Thu 5/14:07 pmSTL - ONT

1 stop9h 52mFrontier

Thu 5/810:15 pmONT - STL

1 stop20h 50mFrontier

Deal found 4/2

$208

Mon 4/218:35 pmMCI - ONT

1 stop5h 24mFrontier

Thu 4/2412:59 amONT - MCI

1 stop16h 51mFrontier

Deal found 4/2

$211

Fri 7/47:18 amSGF - ONT

1 stop6h 41mAmerican Airlines

Fri 7/1112:59 amONT - SGF

1 stop5h 47mAmerican Airlines

Deal found 4/2

$239

Tue 4/225:07 amMCI - ONT

1 stop8h 39mAmerican Airlines

Tue 4/292:44 pmONT - MCI

1 stop5h 41mAmerican Airlines

Deal found 4/1

$255

Tue 4/296:05 pmMCI - ONT

1 stop7h 36mDelta

Wed 4/306:00 amONT - MCI

1 stop5h 18mDelta

Deal found 4/1

$257

Tue 4/297:40 amSTL - ONT

1 stop6h 36mDelta

Wed 5/76:00 amONT - STL

1 stop5h 34mDelta

Deal found 4/1

$307

Tue 4/293:59 pmMCI - ONT

1 stop9h 59mAlaska Airlines

Thu 5/111:46 amONT - MCI

1 stop10h 13mAlaska Airlines

Deal found 4/2

$315

Fri 5/96:53 pmSTL - ONT

1 stop7h 06mMultiple Airlines

Mon 5/126:24 pmONT - STL

2 stops13h 25mMultiple Airlines

Deal found 4/2

$334

Sat 5/34:50 pmSTL - ONT

1 stop7h 10mUnited Airlines

Sat 5/101:20 pmONT - STL

1 stop5h 41mUnited Airlines

Deal found 4/1

$339

Wed 7/309:25 amSTL - ONT

2 stops8h 49mAmerican Airlines

Thu 8/71:30 pmONT - STL

1 stop8h 18mAmerican Airlines

Deal found 4/2

$348

Mon 5/53:01 pmSGF - ONT

1 stop8h 59mUnited Airlines

Sat 5/174:15 pmONT - SGF

1 stop5h 15mUnited Airlines

Deal found 4/1

$348

Wed 5/213:10 pmMCI - ONT

1 stop8h 50mUnited Airlines

Sun 5/256:00 amONT - MCI

2 stops8h 12mUnited Airlines

Deal found 4/2

$362

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 April 3, 2025.

Thu 5/14:07 pmSTL - ONT

1 stop9h 52mFrontier

Thu 5/810:15 pmONT - STL

1 stop20h 50mFrontier

Deal found 4/2

$208

Fri 7/47:18 amSGF - ONT

1 stop6h 41mAmerican Airlines

Fri 7/1112:59 amONT - SGF

1 stop5h 47mAmerican Airlines

Deal found 4/2

$239

Tue 4/293:59 pmMCI - ONT

1 stop9h 59mHawaiian Airlines

Tue 5/611:46 amONT - MCI

1 stop10h 13mHawaiian Airlines

Deal found 4/2

$275

Tue 4/296:05 pmMCI - ONT

1 stop7h 36mDelta

Mon 5/55:15 pmONT - MCI

1 stop4h 59mDelta

Deal found 4/2

$296

Tue 4/293:59 pmMCI - ONT

1 stop9h 59mAlaska Airlines

Thu 5/111:46 amONT - MCI

1 stop10h 13mAlaska Airlines

Deal found 4/2

$315

Fri 5/96:53 pmSTL - ONT

1 stop7h 06mMultiple Airlines

Mon 5/126:24 pmONT - STL

2 stops13h 25mMultiple Airlines

Deal found 4/2

$334

Tue 5/203:10 pmMCI - ONT

1 stop8h 50mUnited Airlines

Wed 5/214:15 pmONT - MCI

1 stop5h 29mUnited Airlines

Deal found 4/2

$335

Thu 5/295:35 amSTL - ONT

1 stop7h 30mSouthwest

Mon 6/29:00 amONT - STL

2 stops7h 30mSouthwest

Deal found 4/1

$376

Mon 4/218:35 pmMCI - ONT

1 stop5h 24mFrontier

Thu 4/2412:59 amONT - MCI

1 stop16h 51mFrontier

Deal found 4/2

$211

Tue 4/297:40 amSTL - ONT

1 stop6h 36mDelta

Wed 5/76:00 amONT - STL

1 stop5h 34mDelta

Deal found 4/1

$307

Sat 5/34:50 pmSTL - ONT

1 stop7h 10mUnited Airlines

Sat 5/101:20 pmONT - STL

1 stop5h 41mUnited Airlines

Deal found 4/1

$339

Wed 7/309:25 amSTL - ONT

2 stops8h 49mAmerican Airlines

Thu 8/71:30 pmONT - STL

1 stop8h 18mAmerican Airlines

Deal found 4/2

$348

Last-minute flights from Missouri to Ontario
Discover last-minute flight deals from Missouri to Ontario. Data last updated April 3, 2025 and is based on user searches.

Mon 4/72:57 pmMCI - ONT

1 stop9h 01mMultiple Airlines

Tue 4/87:00 amONT - MCI

1 stop9h 48mMultiple Airlines

Deal found 4/2

$795

Tue 4/85:30 pmSTL - ONT

1 stop7h 06mDelta

Thu 4/106:00 amONT - STL

1 stop5h 19mDelta

Deal found 4/2

$712

Tue 4/86:30 amSTL - ONT

2 stops10h 47mUnited Airlines

Thu 4/106:00 amONT - STL

1 stop8h 52mUnited Airlines

Deal found 4/2

$717

Wed 4/97:28 pmMCI - ONT

1 stop16h 00mAlaska Airlines

Wed 4/1610:18 amONT - MCI

1 stop6h 30mAlaska Airlines

Deal found 4/2

$532

Wed 4/96:00 amMCI - ONT

2 stops10h 50mUnited Airlines

Wed 4/161:35 pmONT - MCI

1 stop5h 04mUnited Airlines

Deal found 4/2

$619

Thu 4/103:11 pmSTL - ONT

1 stop10h 48mAlaska Airlines

Sun 4/137:00 amONT - STL

2 stops14h 59mAlaska Airlines

Deal found 4/3

$733

Fri 4/118:35 pmMCI - ONT

1 stop23h 22mFrontier

Sat 4/1212:59 amONT - MCI

1 stop16h 46mFrontier

Deal found 4/2

$290

Fri 4/112:19 pmSGF - ONT

1 stop6h 10mAmerican Airlines

Mon 4/142:44 pmONT - SGF

1 stop7h 10mAmerican Airlines

Deal found 4/1

$379

Fri 4/119:05 amSTL - ONT

1 stop5h 30mSouthwest

Wed 4/168:55 amONT - STL

2 stops6h 50mSouthwest

Deal found 4/1

$616

Sun 4/131:06 pmSTL - ONT

1 stop28h 03mFrontier

Thu 4/2410:53 amONT - STL

1 stop8h 12mFrontier

Deal found 4/2

$243

Mon 4/218:35 pmMCI - ONT

1 stop5h 24mFrontier

Thu 4/2412:59 amONT - MCI

1 stop16h 51mFrontier

Deal found 4/2

$211

Thu 4/245:07 amMCI - ONT

1 stop6h 47mAmerican Airlines

Fri 4/2510:40 pmONT - MCI

1 stop8h 29mAmerican Airlines

Deal found 4/2

$353

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 April 3, 2025.

Fri 5/96:53 pmSTL - ONT

1 stop7h 06mFrontier

Deal found 4/2

$105

Fri 5/28:41 pmMCI - ONT

1 stop5h 18mFrontier

Deal found 4/2

$117

Wed 5/286:05 pmMCI - ONT

1 stop7h 37mDelta

Deal found 4/2

$129

Tue 6/173:24 pmSTL - ONT

1 stop10h 49mHawaiian Airlines

Deal found 4/2

$153

Tue 4/295:27 pmSTL - ONT

1 stop6h 43mAmerican Airlines

Deal found 4/2

$154

Tue 5/66:00 amMCI - ONT

2 stops10h 25mUnited Airlines

Deal found 4/2

$173

Sat 6/710:41 amMCI - ONT

2 stops9h 31mAmerican Airlines

Deal found 4/2

$174

Tue 5/66:30 amSTL - ONT

1 stop11h 02mAlaska Airlines

Deal found 4/2

$187

Tue 5/134:50 pmSTL - ONT

1 stop7h 10mUnited Airlines

Deal found 4/2

$199

Thu 5/223:55 pmMCI - ONT

1 stop6h 30mSouthwest

Deal found 4/2

$200

Thu 5/17:00 amMCI - ONT

1 stop12h 30mAlaska Airlines

Deal found 4/2

$217

Fri 8/85:10 pmSGF - ONT

1 stop5h 44mUnited Airlines

Deal found 4/2

$268

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

St. LouisOntario

STL - ONT

STLONT

Lambert-St Louis

Thu 5/1

4:07 pm-11:59 pm

1 stop9h 52m

Ontario

Thu 5/8

10:15 pm-9:05 pm

1 stop20h 50m

$208

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Mon 4/21

8:35 pm-11:59 pm

1 stop5h 24m

Ontario

Thu 4/24

12:59 am-7:50 pm

1 stop16h 51m

$211

SpringfieldOntario

SGF - ONT

SGFONT

Springfield-Branson

Fri 7/4

7:18 am-11:59 am

1 stop6h 41m

Ontario

Fri 7/11

12:59 am-8:46 am

1 stop5h 47m

$239

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Tue 4/22

5:07 am-11:46 am

1 stop8h 39m

Ontario

Tue 4/29

2:44 pm-10:25 pm

1 stop5h 41m

$255

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Tue 4/29

6:05 pm-11:41 pm

1 stop7h 36m

Ontario

Wed 4/30

6:00 am-1:18 pm

1 stop5h 18m

$257

St. LouisOntario

STL - ONT

STLONT

Lambert-St Louis

Tue 4/29

7:40 am-12:16 pm

1 stop6h 36m

Ontario

Wed 5/7

6:00 am-1:34 pm

1 stop5h 34m

$307

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Tue 4/29

3:59 pm-11:58 pm

1 stop9h 59m

Ontario

Thu 5/1

11:46 am-11:59 pm

1 stop10h 13m

$315

St. LouisOntario

STL - ONT

STLONT

Lambert-St Louis

Fri 5/9

6:53 pm-11:59 pm

1 stop7h 06m

Ontario

Mon 5/12

6:24 pm-9:49 am

2 stops13h 25m

$334

St. LouisOntario

STL - ONT

STLONT

Lambert-St Louis

Sat 5/3

4:50 pm-10:00 pm

1 stop7h 10m

Ontario

Sat 5/10

1:20 pm-9:01 pm

1 stop5h 41m

$339

SpringfieldOntario

SGF - ONT

SGFONT

Springfield-Branson

Mon 5/5

3:01 pm-10:00 pm

1 stop8h 59m

Ontario

Sat 5/17

4:15 pm-11:30 pm

1 stop5h 15m

$348

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/2

Showing 1-10 of 33 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 $328). 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.

Rainfall in Ontario 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

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

Read reviews from past customers who have flown Alaska Airlines, Southwest 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.

Alaska Airlines

8.0

Very good

9,825 reviews

Reviews

1 / 20

10.0

Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot

Alaska Airlines

8.0

Very good

9,825 reviews

Alaska Airlines

8.0

Very good

9,825 reviews

Reviews

1 / 20

10.0

Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot

Southwest

8.0

Very good

4,274 reviews

Alaska Airlines

8.0

Very good

9,825 reviews

Reviews

1 / 20

10.0

Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot

Delta

8.0

Very good

7,897 reviews

Alaska Airlines

8.0

Very good

9,825 reviews

Reviews

1 / 20

10.0

Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot

Hawaiian Airlines

7.9

Good

2,344 reviews

Alaska Airlines

8.0

Very good

9,825 reviews

Reviews

1 / 20

10.0

Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot

United Airlines

7.4

Good

8,619 reviews

Alaska Airlines

8.0

Very good

9,825 reviews

Reviews

1 / 20

10.0

Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot

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.
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 $105. Users have also found prices from $129 and $153 on Delta and Hawaiian 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 $328). 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 6 airlines flying from Missouri to Ontario

Airline	Cheapest	Average	Flexibility	On-time
Spirit Airlines	Cheapest$98	Average$180	FlexibilityNo cancel fee	On-time65%
Frontier	Cheapest$114	Average$200	FlexibilityNo cancel fee	On-time62%
Delta	Cheapest$181	Average$361	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$268	Average$413	FlexibilityNo cancel fee	On-time71%
United Airlines	Cheapest$294	Average$422	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$326	Average$407	FlexibilityNo cancel fee	On-time63%

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$105+ 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 5/9. 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

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

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 April 3, 2025.

Most accurate provider

Most trusted provider

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 April 3, 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 April 3, 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 April 3, 2025.

Rainfall in Ontario by month

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

Temperature in Ontario by month

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

Reviews of airlines servicing Ontario

Read reviews from past customers who have flown Alaska Airlines, Southwest 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.

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?

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 6 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 April 3, 2025.