ONT - BIL

$131 Find Cheap Flights from Ontario to Billings

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Billings departing on 3/26. 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 Billings

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Billings, 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 Ontario to Billings, as well as popular online travel agencies
Travelers love KAYAK
41 299 237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$217
Typical prices: $337-$381
United Airlines
Sat 2/14Sat 2/21
ONT - BIL • 1 stop
Cheapest one-way
$131
United Airlines
Thu 3/26
ONT - BIL • 1 stop
Top airlines
United Airlines
Cheapest • from $217 (round-trip)
Alaska Airlines
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
April
Cheapest • 35% price drop
May
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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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 Billings!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Ontario to Billings (ONT-BIL)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Billings 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 Ontario to Billings

Sat, Feb 14 - Sat, Feb 21
United Airlines Logo
1:45 pm - 9:21 pm
ONT
-
BIL
6h 36m
1 stop
United Airlines Logo
7:00 am - 12:43 pm
BIL
-
ONT
6h 43m
1 stop
$217United Airlines
Tue, Jun 2 - Tue, Jun 16
Delta Logo
5:05 pm - 10:27 pm
ONT
-
BIL
4h 22m
1 stop
Delta Logo
5:45 am - 9:01 am
BIL
-
ONT
4h 16m
1 stop
$261Delta
Thu, Feb 5 - Tue, Feb 10
Delta Logo
6:00 am - 11:03 am
ONT
-
BIL
4h 03m
1 stop
Delta Logo
6:15 pm - 11:58 pm
BIL
-
ONT
6h 43m
1 stop
$269Delta
Sat, Feb 14 - Wed, Feb 18
United Airlines Logo
5:00 am - 1:23 pm
ONT
-
BIL
7h 23m
1 stop
United Airlines Logo
2:35 pm - 8:50 pm
BIL
-
ONT
7h 15m
1 stop
$287United Airlines
Sat, Feb 7 - Sun, Feb 8
Alaska Airlines Logo
4:03 pm - 11:36 pm
ONT
-
BIL
6h 33m
1 stop
Alaska Airlines Logo
3:35 pm - 8:10 pm
BIL
-
ONT
5h 35m
1 stop
$291Alaska Airlines
Sat, Mar 7 - Sun, Mar 8
Alaska Airlines Logo
4:02 pm - 11:38 pm
ONT
-
BIL
6h 36m
1 stop
Alaska Airlines Logo
3:32 pm - 11:52 pm
BIL
-
ONT
9h 20m
1 stop
$313Alaska Airlines
Sat, Feb 7 - Sun, Feb 8
Alaska Airlines Logo
11:53 am - 1:22 pm
ONT
-
BIL
24h 29m
2 stops
Alaska Airlines Logo
3:35 pm - 8:10 pm
BIL
-
ONT
5h 35m
1 stop
$324Alaska Airlines
Thu, Feb 5 - Tue, Feb 10
Alaska Airlines Logo
5:59 pm - 1:22 pm
ONT
-
BIL
18h 23m
1 stop
Alaska Airlines Logo
7:00 am - 5:03 pm
BIL
-
ONT
11h 03m
2 stops
$327Alaska Airlines
Tue, Jun 2 - Tue, Jun 16
United Airlines Logo
1:00 pm - 8:51 pm
ONT
-
BIL
6h 51m
1 stop
United Airlines Logo
5:00 am - 12:20 pm
BIL
-
ONT
8h 20m
2 stops
$331United Airlines
Fri, Feb 13 - Mon, Feb 16
Delta Logo
6:00 am - 11:00 am
ONT
-
BIL
4h 00m
1 stop
Delta Logo
6:15 pm - 11:49 pm
BIL
-
ONT
6h 34m
1 stop
$334Delta
Booking Insights

KAYAK's insights & trends for Ontario to Billings flights

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

How much is a round-trip flight from Ontario to Billings?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Ontario to Billings departing in February.

What is the cheapest month to fly from Ontario to Billings?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Billings, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Ontario to Billings is April, where tickets cost $269 (return) on average. On the other hand, the most expensive months are January and March, where the average cost of round-trip tickets is $796 and $621 respectively.

Good to know

Low seasonApril
Cheapest flight$131
Best time to beat the crowds with an average 35% drop in price.
Most popular time to fly and prices are also 25% lower on average.
Flight from Ontario to Billings

When to book flights from Ontario to Billings

Are your dates flexible? Find out the best times to travel from Ontario to Billings 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 Ontario to Billings

  • What is the cheapest flight from Ontario to Billings?

    In the last 3 days, the lowest price for a flight from Ontario to Billings was $131 for a one-way ticket and $217 for a round-trip.

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

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

  • Which airports will I be using when flying from Ontario to Billings?

    Ontario airport is called Ontario and the only airport in Billings is Billings Logan Intl.

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

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

  • Which airline alliances offer flights from Ontario to Billings?

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

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

    The two airlines most popular with KAYAK users for flights from Ontario to Billings are Alaska Airlines and Delta. With an average price for the route of $504 and an overall rating of 8.0, Alaska Airlines is the most popular choice. Delta is also a great choice for the route, with an average price of $335 and an overall rating of 7.9.

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

    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 Ontario to Billings.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Billings from Ontario 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 Ontario to Billings?

    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 Billings with an airline and back to Ontario with another airline. Booking your flights between Ontario and BIL 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 Ontario to Billings?

    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 Billings from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 3 airlines serving from Ontario to Billings

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Billings. 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 Ontario to Billings? 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.
8.0
Alaska AirlinesOverall score based on 11737 reviews
7.1Food
7.0Entertainment
8.1Boarding
7.8Comfort
8.5Crew
Airline reviews

The Alaska Airlines app made it very difficult to find my boarding pass. It was very frustrating to use! The flight itself was flawless.

8.0 ExcellentMatt, Jan 2026
SFO - PDX
Read more Alaska Airlines reviews

The Alaska Airlines app made it very difficult to find my boarding pass. It was very frustrating to use! The flight itself was flawless.

It wasn’t great. Your app is not user friendly unless you sign up for those points. It tries to force you and won’t show you flight/trip info until you sign up. You have to somehow get into get your boarding pass because your kiosks don’t offer boarding pass information only bag check. It was not helpful or user friendly. The app is useless unless you sign up for your rewards program. My daughters info was missing even though I checked us in we had to get out of security and go back to a ticket window the woman told us that it sometimes populates incorrectly so it didn’t have her information. It populated incorrect birth date. She said this is common. Luckily we were at Palm Springs and not JFK where leaving the giant security line would have been a much bigger problem. I will avoid your airline in the future if it’s possible. Also no food availability except dry snack boxes.

The whole experience went smoothly with no hitches along the way.

The flight was excellent and very friendly and helpful staff. Will travel again and recommend to friends. Thank you

You need categories to denote when food and entertainment are not available.

My Alaska Airlines return flight, although worked out in the end, didn't start off well. The initial plane that my family and I boarded was grounded because of a mishap that happened to one of the engines and everyone on board had to disembark the plane. Thankfully we were accommodated with a another plane but our initial flight was supposed to have departed at 11 pm San Diego time for Orlando but instead we ended up leaving at 1:40 am San Diego time. All Passengers were informed that part of the delay was that the plane had to be inspected by the captain, the food had to be stocked and the individuals responsible for fueling the plane left for the evening and had to be summoned to return to fill up our. The Alaska Airlines crew at the airport and on the plane were awesome and apologetic. I know that the crew wasn't responsible for the mishap of the engine but I think in the future the airline should offer a complimentary drink or (1) item of food other than pretzels, nuts or chips to all passengers since we're not to blame for the extreme set backs. The airline in general is good and I recommend to all flyers.

Alaska is a great airline. Unfortunately, our flight was canceled in a really late hour and it caused a lot of hardship in my travel process.

Did not have In flight service on my round trip due to turbulence. I did not partake in In flight entertainment. Flight descending into LAX was very turbulent. It would have been nice if the pilot communicated with us during that rough descent into LAX to ease the minds of some of us more nervous flyers.

More comfortable than the flight to Los Angeles. But food was mediocre again. Attendants kind and courteous.

The snack pretzels have garlic. just use normal pretzels. Tomatoijuice instead of only bloody mary mix

Delta’s staff is unmatched. From the gate agents, to the pilots, to the flight attendants… all top of the industry.

The flight was delayed for about 2 hrs. Other than it, it was good.

I am extremely disappointed that delta internal pilot manuals now refer to the Gulf of Mexico as the “gulf of America”. You can bow down to the Orange turd on your own. I will never fly delta again

No lunch on a x-country flight scheduled for 10:50 am departure, arrived 5+ hrs later. That requires a black box label before you pay for the tickets. Worst, when I checked in online, it's specifically said that lunch was served on his flight for economy Plus passengers.

Our flight from SFO to MSP was right on time on 11/15/2025. No delays. As we approached MSP at about 8 pm, we circled in the air until 8:40 pm so I don't call that efficient for MSP. I think the captain should announce the delay and why. (as if we all don't know that we are just circling around the area, slowing down, speeding up, slowing down.) Thank you. Marilyn Fischer

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.

The flight used a B767 with a very old interior from before 2014. The entertainment system did not work at all during the flight despite attempts to reset the system. It was like they flew this route just to be competitive.

Delayed flight (1hour) plus a long layover after an overnight flight with no backup plane available.

Flight delayed for two and half hours and then canceled altogether due to mechanical issues. No mechanic onsite to fix so had to send one from LAX.

My husband upgraded our seats and I don't know if it was due to the type of planet was or if they didn't upgrade our seats. We were supposed to be in I believe comfort seats and they were just as tight as any other seat- no leg room and we are very tall people but at least it wasn't extremely cold. My husband did put in a complaint about our seating because he paid extra and if we would have known that the space and the tightness would have been the same, we just would have gotten the emergency row emergency row seats that we normally get. We love Delta but both our flights coming home we're not good. Oh I forgot to mention that on our flight to Hawaii our luggage wheels got broke and we had to purse new luggage on vacation then we never had this problem so we didn't know protocol and reported it after we got home only for them to tell is we only had 24hrs to report the damage. Not sure what was going on with Delta this vacation trip.

The flight crew where really good. Better then the crew from BNE to SFO

left on time, reasonable boarding process arrived early luggage came out quickly

I’m so sorry, I can’t remember her name, I believe it was Dimpti. She was stellar, also a mature Asian flight attendant, lots of flowers in her hair, just as amazing! But literally the crew was AWESOME . Only downside is there weren’t any charging outlets. Maybe I needed to ask a flight attendant , but it would’ve been nice to have one easily accessible.

Sitting on the runway after we land for almost two hours! Not sure if we should blame United or Just Dumpy Vance.

I boarded flight UA#1318 at Sacramento International Airport going back to Houston TX. The flight was scheduled at 5:10am. I was able to check in virtually using the United Airlines app. When I entered the airport, there was no one outside assisting with checked bags as it was for Delta Airlines. Immediately upon entering, there was a LONG, EXTREMELY LONG line to the kiosks to get boarding passes. I stand in line to get boarding passes then had to move to ANOTHER EXTREMELY LONG line to get my bags checked in. While standing in this line, we noticed an agent taking customers to 3 at a time to her station to check their bags in. Lucky for me, she called me back, checked my bags for me and I was on my way. I then encountered another long line at the TSA check and to avoid I ending up having to sign up for CLEAR to bypass it. So glad, I did.,...Both of my flights were great with no issues, butthe check in progress at Bush Airport was so much smoother. Check-in at SMF airport needs to be anaylzed and corrected. Do better United, I know you can....thanks

Pushed back only to get deplaned due to a tire damaged by ground crew. They did at least go pretty fast. The bathrooms should be banned under the Geneva convention. No room to even sit straight on the toilet. The under-seat entertainment units block what little leg room there is.

United airlines has the best customer experience from booking to arrival. I always fly United airlines. The mileage program is excellent

Older aircraft, no meal, only food was for purchase. Not impressed United.

Not pleasant trip cross country when the entertainment and WiFi system not working. No entertainment for entirety of route. Staff was rather nonchalant in that they dismissed the problem due to age of plane. It would have been nice to know this up front so I could have come prepared to read or download movies before boarding Coincidentally or not, there was a similar issue with the entertainment system on my previous flight I took on my fist leg of the trip. There are no seat TVs, so you must rely on the app when it works. United can do better. Also, what use it it to pay for boarding group 2 when half of the passengers are in the same line as you?

Premium Plus is a really good idea for longer flights

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

Information on your arrival and departure airports