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$106+ Cheap flights from Montana 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 6/27. Fares are subject to change and may not be available on all flights or dates of travel.
BZN — ONT
Jun 23 — Jun 301
Mon 6/23
Mon 6/30
1 adult, Economy
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Cheap flight deals from Montana to Ontario

Keep the following information in mind while searching for Montana to Ontario flight deals. Data was last updated June 18, 2025.

Round-trip from

$216
(Alaska Airlines)

One-way from

$106
(Frontier)

Popular in

July

Cheapest in

January

Average price

$359
From Montana to Ontario
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One-way flight from Montana to Ontario
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Highest demand for flights based on searches. 6% potential increase in price ($25 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Find flight deals from Montana to Ontario

Cheapest flights from Montana to Ontario
Explore the most affordable flight options available from Montana to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 18, 2025.

This Frontier deal was found by Cheapflights users on 6/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/2312:40 pmMSO - ONT
1 stop12h 10mFrontier
Thu 6/2612:59 amONT - MSO
1 stop9h 56mFrontier
Deal found 6/16$200
This Alaska Airlines deal was found by Cheapflights users on 6/18. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/77:25 pmBZN - ONT
1 stop5h 48mAlaska Airlines
Mon 8/1112:00 pmONT - BZN
1 stop5h 31mAlaska Airlines
Deal found 6/18$216
This Hawaiian Airlines deal was found by Cheapflights users on 6/16. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/187:25 pmBZN - ONT
1 stop5h 48mHawaiian Airlines
Sat 9/207:10 amONT - BZN
1 stop5h 04mHawaiian Airlines
Deal found 6/16$228
This Hawaiian Airlines deal was found by Cheapflights users on 6/18. 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.
Thu 10/236:00 amBIL - ONT
1 stop7h 37mHawaiian Airlines
Tue 10/286:00 amONT - BIL
1 stop8h 00mHawaiian Airlines
Deal found 6/18$240
This Delta deal was found by Cheapflights users on 6/18. 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 8/75:30 amFCA - ONT
1 stop4h 17mDelta
Wed 8/134:50 pmONT - FCA
1 stop6h 35mDelta
Deal found 6/18$241
This Delta deal was found by Cheapflights users on 6/17. 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.
Wed 7/307:10 amBZN - ONT
1 stop7h 24mDelta
Mon 8/41:15 pmONT - BZN
2 stops8h 30mDelta
Deal found 6/17$249
This Delta deal was found by Cheapflights users on 6/16. 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.
Mon 7/145:20 amBIL - ONT
1 stop4h 27mDelta
Tue 7/225:09 pmONT - BIL
1 stop5h 58mDelta
Deal found 6/16$251
This Delta deal was found by Cheapflights users on 6/17. 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.
Fri 7/115:30 amMSO - ONT
1 stop4h 17mDelta
Wed 7/165:09 pmONT - MSO
1 stop6h 15mDelta
Deal found 6/17$251
This Alaska Airlines deal was found by Cheapflights users on 6/16. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/176:00 amBIL - ONT
1 stop5h 44mAlaska Airlines
Sat 9/2011:39 amONT - BIL
1 stop5h 59mAlaska Airlines
Deal found 6/16$253
This Alaska Airlines deal was found by Cheapflights users on 6/18. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/255:45 amMSO - ONT
1 stop4h 41mAlaska Airlines
Sat 8/307:10 amONT - MSO
1 stop5h 24mAlaska Airlines
Deal found 6/18$253
This Delta deal was found by Cheapflights users on 6/16. 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 9/275:30 amGTF - ONT
1 stop4h 36mDelta
Wed 10/85:05 pmONT - GTF
1 stop4h 46mDelta
Deal found 6/16$256
This Hawaiian Airlines deal was found by Cheapflights users on 6/16. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/216:40 pmMSO - ONT
1 stop6h 19mHawaiian Airlines
Sun 8/246:00 amONT - MSO
1 stop8h 16mHawaiian Airlines
Deal found 6/16$263

Cheapflights Fare Finder

Customize your flight search to find flights from Montana 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 June 18, 2025.
Use the filters below to find and compare flights from Montana to Ontario that are best for you.

Fly from

Montana

Fly to

Ontario

Route

Depart

Return

Price

BozemanOntario

BZN - ONT

BZNONT

Bozeman Gallatin Field

Thu 8/7

7:25 pm-12:13 am

1 stop5h 48m

Ontario

Mon 8/11

12:00 pm-6:31 pm

1 stop5h 31m

$216

BozemanOntario

BZN - ONT

BZNONT

Bozeman Gallatin Field

Mon 8/18

7:25 pm-12:13 am

1 stop5h 48m

Ontario

Sat 9/20

7:10 am-1:14 pm

1 stop5h 04m

$228

BillingsOntario

BIL - ONT

BILONT

Billings Logan Intl

Thu 10/23

6:00 am-12:37 pm

1 stop7h 37m

Ontario

Tue 10/28

6:00 am-3:00 pm

1 stop8h 00m

$240

KalispellOntario

FCA - ONT

FCAONT

Kalispell Glacier Park

Thu 8/7

5:30 am-8:47 am

1 stop4h 17m

Ontario

Wed 8/13

4:50 pm-12:25 am

1 stop6h 35m

$241

BillingsOntario

BIL - ONT

BILONT

Billings Logan Intl

Fri 9/19

5:45 am-9:06 am

1 stop4h 21m

Ontario

Mon 9/22

5:05 pm-10:32 pm

1 stop4h 27m

$241

BozemanOntario

BZN - ONT

BZNONT

Bozeman Gallatin Field

Wed 7/30

7:10 am-1:34 pm

1 stop7h 24m

Ontario

Mon 8/4

1:15 pm-10:45 pm

2 stops8h 30m

$249

MissoulaOntario

MSO - ONT

MSOONT

Missoula Johnson-Bell Field

Fri 7/11

5:30 am-8:47 am

1 stop4h 17m

Ontario

Wed 7/16

5:09 pm-12:24 am

1 stop6h 15m

$251

BillingsOntario

BIL - ONT

BILONT

Billings Logan Intl

Sat 9/20

6:00 am-10:44 am

1 stop5h 44m

Ontario

Tue 9/23

11:39 am-6:38 pm

1 stop5h 59m

$253

MissoulaOntario

MSO - ONT

MSOONT

Missoula Johnson-Bell Field

Mon 8/25

5:45 am-9:26 am

1 stop4h 41m

Ontario

Sat 8/30

7:10 am-1:34 pm

1 stop5h 24m

$253

BillingsOntario

BIL - ONT

BILONT

Billings Logan Intl

Sat 9/20

2:35 pm-8:43 pm

1 stop7h 08m

Ontario

Tue 9/23

1:42 pm-10:46 pm

2 stops8h 04m

$259

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/17

Showing 1-10 of 55 results
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Best time to book a flight from Montana to Ontario

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

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

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

Find hourly flight availability from Montana 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 June 18, 2025.

When flying from Montana to Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 June 18, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest and Delta from Montana to Ontario to help guide your decision. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Entertainment

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Entertainment

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,280 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Entertainment

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,964 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Entertainment

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.8
Good
2,507 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Entertainment

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,810 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Entertainment

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Related info for your journey

Find useful and relevant information for your journey from Montana 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 Montana?

    For a flight from Montana 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 Montana to Ontario one-way?

    The cheapest airlines for a one-way flight from Montana to Ontario are Frontier ($106), Hawaiian Airlines ($108), and Alaska Airlines ($120).

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

    When deciding which route to take from Montana to Ontario consider Bozeman Gallatin Field - Ontario, Billings Logan Intl - Ontario or Missoula Johnson-Bell Field - Ontario as they are the most popular.

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

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

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

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

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

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

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

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Montana to Ontario

Discover the top 4 airlines that operate flights from Montana 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 June 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$82Average$395FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$232Average$472FlexibilityNo cancel feeOn-time69%
DeltaCheapest$232Average$364FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$256Average$360FlexibilityNo cancel feeOn-time63%

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