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$139+ Cheap flights from Missoula to Ontario (MSO - 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 9/13. Fares are subject to change and may not be available on all flights or dates of travel.
MSO — ONT
Aug 24 — Aug 311
Sun 8/24
Sun 8/31
1 adult, Economy
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Cheap flight deals from Missoula to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Missoula (MSO) to Ontario (ONT). 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 August 19, 2025.

Round-trip from

$240
(Alaska Airlines)

One-way from

$139
(Alaska Airlines)

Popular in

December

Cheapest in

August

Average price

$227
From Missoula Johnson-Bell Field to Ontario
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One-way flight from Missoula Johnson-Bell Field to Ontario
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Highest demand for flights based on searches. 27% potential increase in price ($150 potential increase over avg. RT price).
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Cheapest flight prices on average. 17% potential price decrease ($60 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Missoula to Ontario

Cheapest flights from Missoula to Ontario
Explore the most affordable flight options available from Missoula to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 19, 2025.

This Alaska Airlines deal was found by Cheapflights users on 8/17. 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.
Tue 9/166:40 pmMSO - ONT
1 stop17h 04mAlaska Airlines
Mon 9/223:06 pmONT - MSO
1 stop8h 21mAlaska Airlines
Deal found 8/17$240
This Delta deal was found by Cheapflights users on 8/15. 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.
Fri 9/125:30 amMSO - ONT
1 stop4h 27mDelta
Mon 9/159:50 amONT - MSO
1 stop6h 50mDelta
Deal found 8/15$241
This Delta deal was found by Cheapflights users on 8/18. 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 10/235:25 amMSO - ONT
1 stop4h 40mDelta
Tue 10/286:37 amONT - MSO
2 stops10h 03mDelta
Deal found 8/18$246
This Delta deal was found by Cheapflights users on 8/18. 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.
Sat 10/255:25 amMSO - ONT
1 stop4h 40mDelta
Tue 10/284:35 pmONT - MSO
1 stop6h 42mDelta
Deal found 8/18$260
This Delta deal was found by Cheapflights users on 8/16. 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.
Wed 10/86:20 pmMSO - ONT
1 stop6h 19mDelta
Mon 10/134:35 pmONT - MSO
1 stop6h 42mDelta
Deal found 8/16$266
This Delta deal was found by Cheapflights users on 8/16. 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.
Sat 9/205:30 amMSO - ONT
1 stop4h 27mDelta
Sat 9/279:50 amONT - MSO
1 stop6h 17mDelta
Deal found 8/16$279
This Hawaiian Airlines deal was found by Cheapflights users on 8/18. 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.
Fri 10/246:40 pmMSO - ONT
1 stop6h 23mHawaiian Airlines
Mon 10/276:00 amONT - MSO
1 stop5h 19mHawaiian Airlines
Deal found 8/18$284
This Delta deal was found by Cheapflights users on 8/17. 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.
Tue 9/166:20 pmMSO - ONT
1 stop6h 22mDelta
Mon 9/2211:50 amONT - MSO
2 stops11h 28mDelta
Deal found 8/17$293
This United Airlines deal was found by Cheapflights users on 8/18. 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.
Fri 9/124:17 pmMSO - ONT
1 stop5h 16mUnited Airlines
Sun 9/145:10 amONT - MSO
1 stop7h 24mUnited Airlines
Deal found 8/18$311
This Hawaiian Airlines deal was found by Cheapflights users on 8/17. 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.
Wed 10/152:07 pmMSO - ONT
1 stop5h 26mHawaiian Airlines
Wed 10/226:00 amONT - MSO
1 stop5h 18mHawaiian Airlines
Deal found 8/17$322

Cheapflights Fare Finder

 
Customize your flight search to find flights from Missoula 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 August 19, 2025.
Use the filters below to find and compare flights from Missoula to Ontario that are best for you.

Fly from

Missoula

Fly to

Ontario

Route

Depart

Return

Price

MissoulaOntario

MSO - ONT

MSOONT

Missoula Johnson-Bell Field

Thu 10/23

6:40 pm-12:03 am

1 stop6h 23m

Ontario

Mon 10/27

6:00 am-12:19 pm

1 stop5h 19m

$240

MissoulaOntario

MSO - ONT

MSOONT

Missoula Johnson-Bell Field

Thu 10/23

6:40 pm-12:03 am

1 stop6h 23m

Ontario

Tue 10/28

7:20 am-1:19 pm

1 stop4h 59m

$240

MissoulaOntario

MSO - ONT

MSOONT

Missoula Johnson-Bell Field

Tue 9/16

6:40 pm-10:44 am

1 stop17h 04m

Ontario

Mon 9/22

7:47 pm-12:32 pm

1 stop15h 45m

$240

MissoulaOntario

MSO - ONT

MSOONT

Missoula Johnson-Bell Field

Fri 10/24

6:20 pm-11:39 pm

1 stop6h 19m

Ontario

Tue 10/28

4:35 pm-12:17 am

1 stop6h 42m

$241

MissoulaOntario

MSO - ONT

MSOONT

Missoula Johnson-Bell Field

Fri 9/12

5:30 am-8:57 am

1 stop4h 27m

Ontario

Mon 9/15

9:50 am-5:40 pm

1 stop6h 50m

$241

MissoulaOntario

MSO - ONT

MSOONT

Missoula Johnson-Bell Field

Thu 10/23

5:25 am-9:05 am

1 stop4h 40m

Ontario

Tue 10/28

6:37 am-5:40 pm

2 stops10h 03m

$246

MissoulaOntario

MSO - ONT

MSOONT

Missoula Johnson-Bell Field

Sat 10/25

5:25 am-9:05 am

1 stop4h 40m

Ontario

Tue 10/28

4:35 pm-12:17 am

1 stop6h 42m

$260

MissoulaOntario

MSO - ONT

MSOONT

Missoula Johnson-Bell Field

Wed 10/8

6:20 pm-11:39 pm

1 stop6h 19m

Ontario

Mon 10/13

4:35 pm-12:17 am

1 stop6h 42m

$266

MissoulaOntario

MSO - ONT

MSOONT

Missoula Johnson-Bell Field

Mon 9/1

5:30 am-8:55 am

1 stop4h 25m

$256

MissoulaOntario

MSO - ONT

MSOONT

Missoula Johnson-Bell Field

Tue 12/30

5:15 pm-12:38 pm

1 stop20h 23m

$352

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/18

Showing 1-10 of 19 results
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Best time to book a flight from Missoula to Ontario

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

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

Currently, August is the cheapest month in which you can book a flight from Missoula to Ontario (average of $246). Flying from Missoula 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 MSO to ONT?

Find hourly flight availability from Missoula 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 August 19, 2025.

It’s optimal to fly from Missoula to Ontario in the afternoon. By choosing this option you can save up to 32% on the cost of your flight, compared to a flight in the morning.

How much does it cost to fly round-trip from Missoula to Ontario?

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 August 19, 2025.
Read through reviews of airlines operating flights from Missoula to Ontario, such as Alaska Airlines and Delta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Food

7.1

Boarding

8.1

Overall

8.0

Crew

8.5

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

BOI - LAX

flying in first class, my husband froze the entire flight and was miserable. first class does not offer blankets or any entertainment. (TV etc)
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Food

7.1

Boarding

8.1

Overall

8.0

Crew

8.5

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

BOI - LAX

flying in first class, my husband froze the entire flight and was miserable. first class does not offer blankets or any entertainment. (TV etc)
Delta
8.0
Very good
7,981 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Food

7.1

Boarding

8.1

Overall

8.0

Crew

8.5

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

BOI - LAX

flying in first class, my husband froze the entire flight and was miserable. first class does not offer blankets or any entertainment. (TV etc)

Related info for your journey

Find useful and relevant information for your journey from Missoula to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Missoula to Ontario?

    Airlines like Alaska Airlines and Delta fly from Missoula to Ontario in about 6h 19m. The time it takes to get you to your destination can typically vary by up to 04m. The distance from Missoula to Ontario is about 907 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from Missoula to Ontario round-trip?

    According to our current data, Alaska Airlines ($229), and Delta ($244) offers the cheapest pricing from Missoula to Ontario. Users have found that Alaska Airlines is 42% cheaper than the other options available to this destination.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Missoula to Ontario (average of $246). Flying from Missoula 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

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Top 2 airlines flying from Missoula to Ontario

Discover the top 2 airlines that operate flights from Missoula 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 August 19, 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$229Average$327FlexibilityNo cancel feeOn-time75%
DeltaCheapest$244Average$309FlexibilityNo cancel feeOn-timeN/A

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