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Ontario

$125+ Cheap flights from Billings to Ontario (BIL - 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 3/30. Fares are subject to change and may not be available on all flights or dates of travel.
BIL — ONT
Mar 20 — Mar 271
Fri 3/20
Fri 3/27
1 adult, Economy
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Cheap flight deals from Billings to Ontario

Cheapest flights from Billings to Ontario
Explore the most affordable flight options available from Billings to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 18, 2026.

This Delta deal was found by Cheapflights users on 2/16. 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.
Tue 4/76:21 pm
BIL
-
ONT
1 stop6h 30m
Delta
Sat 4/116:00 am
ONT
-
BIL
1 stop3h 53m
Delta
Deal found 2/16$269
This Delta deal was found by Cheapflights users on 2/15. 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.
Sun 5/315:35 am
BIL
-
ONT
1 stop4h 18m
Delta
Wed 6/36:00 am
ONT
-
BIL
1 stop3h 54m
Delta
Deal found 2/15$305
This Alaska Airlines deal was found by Cheapflights users on 2/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/217:56 am
BIL
-
ONT
1 stop17h 03m
Alaska Airlines
Fri 4/247:59 pm
ONT
-
BIL
1 stop15h 10m
Alaska Airlines
Deal found 2/15$313
This Alaska Airlines deal was found by Cheapflights users on 2/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/712:34 pm
BIL
-
ONT
1 stop5h 35m
Alaska Airlines
Wed 4/87:00 am
ONT
-
BIL
1 stop5h 25m
Alaska Airlines
Deal found 2/15$319
This Alaska Airlines deal was found by Cheapflights users on 2/17. 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.
Wed 3/257:56 am
BIL
-
ONT
1 stop17h 03m
Alaska Airlines
Mon 4/67:08 pm
ONT
-
BIL
1 stop27h 50m
Alaska Airlines
Deal found 2/17$333
This Delta deal was found by Cheapflights users on 2/17. 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 3/206:21 pm
BIL
-
ONT
1 stop6h 30m
Delta
Sat 3/286:00 am
ONT
-
BIL
1 stop3h 53m
Delta
Deal found 2/17$348
This CheapOair deal was found by Cheapflights users on 2/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/147:11 pm
BIL
-
ONT
1 stop5h 45m
Alaska Airlines
Fri 8/214:00 pm
ONT
-
BIL
1 stop7h 08m
Alaska Airlines
Deal found 2/15$349
This United Airlines deal was found by Cheapflights users on 2/14. 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.
Wed 4/152:35 pm
BIL
-
ONT
2 stops9h 10m
United Airlines
Sun 4/195:10 am
ONT
-
BIL
1 stop7h 13m
United Airlines
Deal found 2/14$351
This Delta deal was found by Cheapflights users on 2/16. 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.
Tue 3/36:15 pm
BIL
-
ONT
1 stop6h 34m
Delta
Sat 3/76:00 am
ONT
-
BIL
1 stop4h 00m
Delta
Deal found 2/16$371
This United Airlines deal was found by Cheapflights users on 2/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/37:00 am
BIL
-
ONT
2 stops11h 41m
United Airlines
Sat 3/75:15 am
ONT
-
BIL
1 stop7h 08m
United Airlines
Deal found 2/16$376
This Delta deal was found by Cheapflights users on 2/14. 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 4/156:18 pm
BIL
-
ONT
1 stop6h 26m
Delta
Sun 4/195:05 pm
ONT
-
BIL
1 stop4h 19m
Delta
Deal found 2/14$380

Find flight deals from Billings to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Billings (BIL) 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 February 18, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$269
(Delta)

One-way from

$125
(Kiwi.com)

Popular in

July

Cheapest in

June

Average price

$455
Provider with most accurate pricing for Billings Logan Intl-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Billings Logan Intl-Ontario flights.
Search Deals
From Billings Logan Intl to Ontario
Search Deals
One-way flight from Billings Logan Intl to Ontario
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($24 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($14 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Billings 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 February 18, 2026.
Use the filters below to find and compare flights from Billings to Ontario that are best for you.

Fly from

Billings

Fly to

Ontario

Route

Depart

Return

Price

BillingsOntario

BIL - ONT

BILONT

Billings Logan Intl

Sun 5/31

5:35 am-8:53 am

1 stop4h 18m

Ontario

Wed 6/3

6:00 am-10:54 am

1 stop3h 54m

$305

BillingsOntario

BIL - ONT

BILONT

Billings Logan Intl

Tue 4/21

7:56 am-11:59 pm

1 stop17h 03m

Ontario

Fri 4/24

7:59 pm-12:09 pm

1 stop15h 10m

$313

BillingsOntario

BIL - ONT

BILONT

Billings Logan Intl

Tue 4/7

12:34 pm-5:09 pm

1 stop5h 35m

Ontario

Wed 4/8

7:00 am-1:25 pm

1 stop5h 25m

$319

BillingsOntario

BIL - ONT

BILONT

Billings Logan Intl

Wed 3/25

7:56 am-11:59 pm

1 stop17h 03m

Ontario

Mon 4/6

7:08 pm-11:58 pm

1 stop27h 50m

$333

BillingsOntario

BIL - ONT

BILONT

Billings Logan Intl

Fri 3/20

6:21 pm-11:51 pm

1 stop6h 30m

Ontario

Sat 3/28

6:00 am-10:53 am

1 stop3h 53m

$348

BillingsOntario

BIL - ONT

BILONT

Billings Logan Intl

Fri 8/14

7:11 pm-11:56 pm

1 stop5h 45m

Ontario

Fri 8/21

4:00 pm-12:08 am

1 stop7h 08m

$349

BillingsOntario

BIL - ONT

BILONT

Billings Logan Intl

Wed 4/15

2:35 pm-10:45 pm

2 stops9h 10m

Ontario

Sun 4/19

5:10 am-1:23 pm

1 stop7h 13m

$351

BillingsOntario

BIL - ONT

BILONT

Billings Logan Intl

Tue 3/3

7:00 am-5:41 pm

2 stops11h 41m

Ontario

Sat 3/7

5:15 am-1:23 pm

1 stop7h 08m

$376

BillingsOntario

BIL - ONT

BILONT

Billings Logan Intl

Wed 4/15

6:18 pm-11:44 pm

1 stop6h 26m

Ontario

Sun 4/19

5:05 pm-10:24 pm

1 stop4h 19m

$380

BillingsOntario

BIL - ONT

BILONT

Billings Logan Intl

Thu 6/18

5:45 am-9:01 am

1 stop4h 16m

Ontario

Sun 6/21

6:00 am-11:00 am

1 stop4h 00m

$380

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/16

Showing 1-10 of 18 results
1
2

Compare providers for flights from Billings to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Billings to Ontario in February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Billings-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Billings-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Billings-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Billings-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Billings-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Billings to Ontario

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

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

Currently, April is the cheapest month in which you can book a flight from Billings to Ontario (average of $126). Flying from Billings to Ontario in May is currently the most expensive (average of $264). 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.

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 February 18, 2026.
See what other customers who have flown with Delta and United Airlines from Billings to Ontario have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,207 reviews

Boarding

8.1

Entertainment

7.8

Overall

7.9

Comfort

7.9

Crew

8.5

Food

7.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
7.9
Good
8,207 reviews
Delta
7.9
Good
8,207 reviews

Boarding

8.1

Entertainment

7.8

Overall

7.9

Comfort

7.9

Crew

8.5

Food

7.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
United Airlines
7.4
Good
9,312 reviews
Delta
7.9
Good
8,207 reviews

Boarding

8.1

Entertainment

7.8

Overall

7.9

Comfort

7.9

Crew

8.5

Food

7.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

Find useful and relevant information for your journey from Billings 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 Billings to Ontario?

    For as low as $305, Delta can have you in Ontario from Billings in 4h 18m. The distance between Billings and Ontario is about 941 mi. This flight may include one or multiple stops.

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

    Our cheapest airline available from Billings to Ontario is United Airlines. Our recent data shows that you can find tickets from as low as $241 on this airline. An additional option worth looking into is Delta, starting at $244. These flights start at 38% lower than the current average price 3 months from now.

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

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

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

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

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

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

    Currently, April is the cheapest month in which you can book a flight from Billings to Ontario (average of $126). Flying from Billings to Ontario in May is currently the most expensive (average of $264). 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 Billings to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 2 airlines flying from Billings to Ontario

Discover the top 2 airlines that operate flights from Billings 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 February 18, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$241Average$396FlexibilityNo cancel feeOn-time69%
DeltaCheapest$244Average$333FlexibilityNo cancel feeOn-timeN/A

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