HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$156+ 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 9/24. Fares are subject to change and may not be available on all flights or dates of travel.
BIL — ONT
Jun 11 — Jun 181
Thu 6/11
Thu 6/18
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Billings to Ontario with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 May 12, 2026.

This Delta deal was found by Cheapflights users on 5/11. 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 7/285:20 am
BIL
-
ONT
1 stop4h 27m
Delta
Tue 8/46:00 am
ONT
-
BIL
1 stop4h 07m
Delta
Deal found 5/11$311
This Alaska Airlines deal was found by Cheapflights users on 5/12. 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 8/176:00 am
BIL
-
ONT
1 stop6h 14m
Alaska Airlines
Thu 8/203:05 pm
ONT
-
BIL
1 stop7h 24m
Alaska Airlines
Deal found 5/12$331
This Delta deal was found by Cheapflights users on 5/11. 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 5/2611:34 am
BIL
-
ONT
1 stop5h 43m
Delta
Mon 6/14:57 pm
ONT
-
BIL
1 stop4h 55m
Delta
Deal found 5/11$336
This Delta deal was found by Cheapflights users on 5/11. 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 6/85:20 am
BIL
-
ONT
1 stop4h 30m
Delta
Mon 6/156:00 am
ONT
-
BIL
1 stop3h 59m
Delta
Deal found 5/11$341
This Delta deal was found by Cheapflights users on 5/11. 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 7/245:20 am
BIL
-
ONT
1 stop4h 27m
Delta
Fri 8/75:06 pm
ONT
-
BIL
1 stop4h 29m
Delta
Deal found 5/11$361
This Delta deal was found by Cheapflights users on 5/11. 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 7/265:20 am
BIL
-
ONT
1 stop4h 27m
Delta
Sun 8/25:10 pm
ONT
-
BIL
1 stop4h 40m
Delta
Deal found 5/11$385
This Alaska Airlines deal was found by Cheapflights users on 5/11. 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.
Sat 7/256:00 am
BIL
-
ONT
1 stop8h 09m
Alaska Airlines
Tue 8/47:00 am
ONT
-
BIL
1 stop7h 03m
Alaska Airlines
Deal found 5/11$407
This Expedia deal was found by Cheapflights users on 5/11. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/27:22 pm
BIL
-
ONT
1 stop16h 52m
Alaska Airlines
Sat 7/45:32 pm
ONT
-
BIL
1 stop20h 31m
Alaska Airlines
Deal found 5/11$409
This Delta deal was found by Cheapflights users on 5/8. 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 5/236:19 pm
BIL
-
ONT
1 stop5h 26m
Delta
Wed 5/274:57 pm
ONT
-
BIL
1 stop4h 55m
Delta
Deal found 5/8$411
This Delta deal was found by Cheapflights users on 5/11. 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 7/256:34 pm
BIL
-
ONT
1 stop4h 49m
Delta
Mon 8/35:06 pm
ONT
-
BIL
1 stop4h 29m
Delta
Deal found 5/11$422
This Delta deal was found by Cheapflights users on 5/11. 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 7/265:20 am
BIL
-
ONT
1 stop4h 27m
Delta
Fri 8/75:06 pm
ONT
-
BIL
1 stop4h 29m
Delta
Deal found 5/11$435

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 May 12, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$311
(Delta)

One-way from

$156
(Delta)

Popular in

July

Cheapest in

November

Average price

$393
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. 9% potential increase in price ($44 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 May 12, 2026.
Use the filters below to find and compare flights from Billings to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BillingsOntario

BIL - ONT

BILONT

Billings Logan Intl

Fri 7/24

5:20 am-8:47 am

1 stop4h 27m

Ontario

Mon 8/3

5:06 pm-10:35 pm

1 stop4h 29m

$311

BillingsOntario

BIL - ONT

BILONT

Billings Logan Intl

Fri 7/24

5:20 am-8:47 am

1 stop4h 27m

Ontario

Wed 8/5

6:00 am-11:07 am

1 stop4h 07m

$311

BillingsOntario

BIL - ONT

BILONT

Billings Logan Intl

Tue 5/26

11:34 am-4:17 pm

1 stop5h 43m

Ontario

Mon 6/1

4:57 pm-10:52 pm

1 stop4h 55m

$336
Quickest round-trip

BillingsOntario

BIL - ONT

BILONT

Billings Logan Intl

Mon 6/8

5:20 am-8:50 am

1 stop4h 30m

Ontario

Mon 6/15

6:00 am-10:59 am

1 stop3h 59m

$341

BillingsOntario

BIL - ONT

BILONT

Billings Logan Intl

Sat 5/23

6:19 pm-10:45 pm

1 stop5h 26m

Ontario

Wed 5/27

4:57 pm-10:52 pm

1 stop4h 55m

$411

BillingsOntario

BIL - ONT

BILONT

Billings Logan Intl

Fri 6/5

7:21 pm-11:10 am

1 stop16h 49m

Ontario

Mon 6/8

8:11 pm-6:41 pm

1 stop21h 30m

$468

BillingsOntario

BIL - ONT

BILONT

Billings Logan Intl

Sat 5/23

2:25 pm-8:42 pm

1 stop7h 17m

Ontario

Thu 5/28

5:00 am-1:22 pm

1 stop7h 22m

$491

BillingsOntario

BIL - ONT

BILONT

Billings Logan Intl

Fri 8/14

1:45 pm-8:36 pm

1 stop7h 51m

Ontario

Fri 8/21

10:45 am-5:41 pm

1 stop5h 56m

$505

BillingsOntario

BIL - ONT

BILONT

Billings Logan Intl

Mon 8/17

6:00 am-11:14 am

1 stop6h 14m

Ontario

Thu 8/20

7:10 am-6:41 pm

2 stops10h 31m

$522

BillingsOntario

BIL - ONT

BILONT

Billings Logan Intl

Mon 6/8

7:21 pm-11:58 pm

1 stop5h 37m

Ontario

Mon 6/15

6:02 am-11:51 pm

1 stop16h 49m

$526

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/10

Showing 1-10 of 20 resultsSorted by cheapest first
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 May.
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

How much does it cost to fly round-trip from Billings 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 May 12, 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
8,446 reviews

Overall

7.9

Entertainment

7.8

Crew

8.5

Food

7.2

Boarding

8.1

Comfort

7.8

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
8,446 reviews
Delta
7.9
Good
8,446 reviews

Overall

7.9

Entertainment

7.8

Crew

8.5

Food

7.2

Boarding

8.1

Comfort

7.8

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
9,701 reviews
Delta
7.9
Good
8,446 reviews

Overall

7.9

Entertainment

7.8

Crew

8.5

Food

7.2

Boarding

8.1

Comfort

7.8

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 $311, Delta can have you in Ontario from Billings in 4h 27m. The distance between Billings and Ontario is about 941 mi.

  • 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 $260. These flights start at 43% 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.

See more FAQs

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.

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 May 12, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$241Average$419FlexibilityNo cancel feeOn-time69%
DeltaCheapest$260Average$454FlexibilityNo cancel feeOn-timeN/A

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.