BIL - ONT

$131 Find Cheap Flights from Billings to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Billings to Ontario departing on 4/21. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Ontario

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Billings to Ontario, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Billings to Ontario, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$260
United Airlines
Tue 4/14Wed 5/6
BIL - ONT • 1 stop
Cheapest one-way
$131
Alaska Airlines
Tue 4/21
BIL - ONT • 1 stop
Top airlines
United Airlines
Cheapest • from $260 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Billings and Ontario. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Seattle (SEA)
Cheapest • Avg $324 (round-trip)
Salt Lake City (SLC)
Shortest trip • 5h 05m (one-way)
Insights
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Ontario!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Billings to Ontario (BIL-ONT)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Billings to Ontario that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Billings to Ontario

Tue, Apr 14 - Wed, May 6
United Airlines Logo
2:35 pm - 8:36 pm
BIL
-
ONT
7h 01m
1 stop
United Airlines Logo
5:00 am - 1:23 pm
ONT
-
BIL
7h 23m
1 stop
$260United Airlines
Tue, Apr 14 - Wed, May 6
Delta Logo
6:18 pm - 11:44 pm
BIL
-
ONT
6h 26m
1 stop
Delta Logo
11:53 am - 10:24 pm
ONT
-
BIL
9h 31m
2 stops
$262Delta
Tue, Apr 7 - Tue, Apr 14
Delta Logo
6:21 pm - 11:51 pm
BIL
-
ONT
6h 30m
1 stop
Delta Logo
5:05 pm - 10:24 pm
ONT
-
BIL
4h 19m
1 stop
$281Delta
Tue, Apr 7 - Tue, Apr 14
Delta Logo
6:21 pm - 11:51 pm
BIL
-
ONT
6h 30m
1 stop
Delta Logo
11:53 am - 10:24 pm
ONT
-
BIL
9h 31m
2 stops
$286Delta
Tue, Apr 28 - Tue, May 12
Alaska Airlines Logo
12:47 pm - 11:48 pm
BIL
-
ONT
12h 01m
1 stop
Alaska Airlines Logo
3:26 pm - 1:21 pm
ONT
-
BIL
20h 55m
1 stop
$293Alaska Airlines
Mon, May 4 - Wed, May 6
United Airlines Logo
5:05 am - 12:22 pm
BIL
-
ONT
8h 17m
2 stops
United Airlines Logo
5:00 am - 1:23 pm
ONT
-
BIL
7h 23m
1 stop
$295United Airlines
Wed, Apr 8 - Wed, Apr 15
Alaska Airlines Logo
2:05 pm - 11:59 pm
BIL
-
ONT
10h 54m
1 stop
Alaska Airlines Logo
7:08 pm - 11:58 pm
ONT
-
BIL
27h 50m
1 stop
$303Alaska Airlines
Wed, May 27 - Sat, May 30
Alaska Airlines Logo
7:21 pm - 11:58 pm
BIL
-
ONT
5h 37m
1 stop
Alaska Airlines Logo
4:03 pm - 11:33 pm
ONT
-
BIL
6h 30m
1 stop
$305Alaska Airlines
Sat, Apr 25 - Wed, Apr 29
Alaska Airlines Logo
2:06 pm - 9:45 am
BIL
-
ONT
20h 39m
1 stop
Alaska Airlines Logo
10:39 am - 12:07 pm
ONT
-
BIL
24h 28m
1 stop
$308Alaska Airlines
Sat, Apr 25 - Wed, Apr 29
United Airlines Logo
2:35 pm - 8:36 pm
BIL
-
ONT
7h 01m
1 stop
United Airlines Logo
5:10 am - 1:23 pm
ONT
-
BIL
7h 13m
1 stop
$313United Airlines
Booking Insights

KAYAK's insights & trends for Billings to Ontario flights

Get data-powered insights and trends into flights from Billings to Ontario to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from Billings to Ontario?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Billings to Ontario were found on United Airlines ($260) and Delta ($262).

Good to know

Low seasonJune
Cheapest flight$131
Best time to beat the crowds with an average 26% drop in price.
Most popular time to fly with an average 6% increase in price.
Flight from Billings to Ontario

When to book flights from Billings to Ontario

Are your dates flexible? Find out the best times to travel from Billings to Ontario based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Billings to Ontario

  • What is the cheapest flight from Billings to Ontario?

    In the last 3 days, the lowest price for a flight from Billings to Ontario was $131 for a one-way ticket and $260 for a round-trip.

  • Do I need a passport to fly between Billings and Ontario?

    No, a passport isn't needed to fly from Billings to Ontario. However, local authorities might ask for an official ID.

  • Which aircraft models fly most regularly from Billings to Ontario?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Billings to Ontario?

    Star Alliance, and SkyTeam are the airline alliances operating flights between Billings and Ontario, with Star Alliance being the most commonly used for this route.

  • Which is the best airline for flights from Billings to Ontario, Delta or United Airlines?

    The two airlines most popular with KAYAK users for flights from Billings to Ontario are Delta and United Airlines. With an average price for the route of $354 and an overall rating of 7.9, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $396 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from Billings to Ontario?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Billings to Ontario.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Billings to Ontario?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Billings is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Billings to Ontario?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Ontario with an airline and back to Billings with another airline. Booking your flights between Billings and ONT can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Billings to Ontario?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Ontario from Billings up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airlines flying from Billings to Ontario

 
See real verified KAYAK customer reviews for airlines flying from Billings to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Billings to Ontario? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
DeltaOverall score based on 8250 reviews
8.1Boarding
7.8Entertainment
7.9Comfort
8.5Crew
7.2Food
Airline reviews

Left a few minutes early. Got in 15 minutes early. Very attentive service on board. Very organized boarding.

10.0 ExcellentCharles, Mar 2026
ABQ - LAX
Read more Delta reviews

Left a few minutes early. Got in 15 minutes early. Very attentive service on board. Very organized boarding.

There’s not much to say about a one hour flight. This is a connection from LA to RNO that I missed the previous night due to a mechanical check delay on my originating flight from JFK to LAX. The short flight itself was fine. Instructions from the pilot and crew were per usual. The coffee was barely lukewarm, which possibly was purposeful so we would down it quickly. Bags were already on carousel upon reaching baggage claim, which was excellent.

Delta continues to set the benchmark for traveler-friendly service with minimal disruption and clear communication within the mainland US (coast to coast). I am consistently pleased to be a Delta customer, and this experience once again met my expectations. There was a brief delay departing from MIA due to a technical issue that required the aircraft to return to the gate. However, the situation was handled professionally and transparently. Fortunately, my planned layover allowed ample buffer time, so the adjustment caused no stress. Overall, another smooth and reassuring experience.

Awesome! On time flight, early arrival, and a complimentary upgrade!

Was forced to check in my small carry on, even though I informed the crew it has very fragile items inside

They double booked seats, the gate staff changed my ticket as I was boarding she went over to the computer and changed it without telling me. She messed up an entire three row section for me and others. Other travelers were outraged but the gate staff were so rude, so condescending saying it wasn't their problem to solve. I would rate this a zero if I could. Will not fly Delta again I'll stick with United and American.

I usually get upgraded so my experience is usually amazing. I did not get upgraded this time - which was fine - but the wifi had issues, the monitors were going in & out, & (though not Delta's fault) one of the gentlemen next to me desperately needed a shower.

I really liked the legroom. I am 6’4”.a at For some reason our seats were not together and using the app to fix it didn’t work. Passengers were nice enough to move for us but you should absolutely ensure a parent sits with their child.

Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.

They changed planes and the new plane couldn’t carry enough fuel to fly across the country so we had to stop in Kansas City to refuel. Flight was delayed .

Flight delayed for more than 16 hrs and no effort was spent to provide an alternate

Overall we had a good experience during our flight from San Francisco to Houston.

it was a very short flight so my expectations were low.

Very disappointing given gate agent behavior. Filed a formal complaint with United.

Flight delayed. WiFi connectivity very poor if not existant. Last minute arrival forced me to run to catch my connection.

The power at the seat didn't work and the seat itself was difficult to adjust - this was a business class seat. Flight attendant gave me miles to compensate. The attendant was very professional and on top of his game the entire flight.

the whole trip was smooth, and as comfortable as flying is these days. flight crew was friendly and very courteous and helpful.

First class ticket gets you a choice of chips or nuts. . Just like economy Southwest. Also no screen in the seats. This is first class???!

Flight arrived 30 min early and bag was waiting at the baggage pickup. United Club HNL was one of the nicest in the system

Yet another flight in which beverage and snack service was skipped. Other that that, firmly mediocre. Landed early, to gate late due to congestion at the gates. Airline's fault or airports fault: unknown.

Everything you need to know for your flight from Billings to Ontario

Information on your arrival and departure airports