BIL - ONT

$164 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 10/30. 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

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
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 22% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

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, Dec 9 - Tue, Dec 16
Alaska Airlines Logo
6:00 am - 11:19 amBIL-ONT
6h 19m1 stop
Alaska Airlines Logo
7:10 am - 1:22 pmONT-BIL
5h 12m1 stop
$240Alaska Airlines
Find Deal
Tue, Dec 9 - Sun, Dec 14
Delta Logo
5:59 pm - 11:46 pmBIL-ONT
6h 47m1 stop
Delta Logo
5:05 pm - 10:32 pmONT-BIL
4h 27m1 stop
$241Delta
Find Deal
Sat, Dec 13 - Tue, Dec 16
Alaska Airlines Logo
6:00 am - 11:19 amBIL-ONT
6h 19m1 stop
Alaska Airlines Logo
6:00 am - 2:56 pmONT-BIL
7h 56m1 stop
$259Alaska Airlines
Find Deal
Sat, Dec 13 - Mon, Dec 15
Delta Logo
5:59 pm - 10:46 pmBIL-ONT
5h 47m1 stop
Delta Logo
5:05 pm - 10:32 pmONT-BIL
4h 27m1 stop
$260Delta
Find Deal
Sat, Dec 13 - Sat, Dec 13
Alaska Airlines Logo
6:00 am - 11:19 amBIL-ONT
6h 19m1 stop
Alaska Airlines Logo
4:15 pm - 12:08 amONT-BIL
6h 53m1 stop
$279Alaska Airlines
Find Deal
Wed, Sep 17 - Wed, Sep 24
United Airlines Logo
2:35 pm - 8:43 pmBIL-ONT
7h 08m1 stop
United Airlines Logo
1:15 pm - 8:34 pmONT-BIL
6h 19m1 stop
$311United Airlines
Find Deal
Wed, Oct 1 - Sat, Oct 4
United Airlines Logo
2:30 pm - 8:24 pmBIL-ONT
6h 54m1 stop
United Airlines Logo
5:05 am - 1:18 pmONT-BIL
7h 13m1 stop
$330United Airlines
Find Deal
Wed, Nov 19 - Mon, Nov 24
American Airlines Logo
6:00 am - 4:01 pmBIL-ONT
11h 01m2 stops
American Airlines Logo
9:59 am - 9:15 pmONT-BIL
10h 16m2 stops
$467American Airlines
Find Deal
Tue, Dec 30 - Fri, Jan 2
American Airlines Logo
7:49 am - 5:54 pmBIL-ONT
11h 05m1 stop
American Airlines Logo
1:28 pm - 10:25 pmONT-BIL
7h 57m1 stop
$479American Airlines
Find Deal
Sun, Aug 31 - Wed, Sep 3
Hawaiian Airlines Logo
6:00 am - 10:44 amBIL-ONT
5h 44m1 stop
Hawaiian Airlines Logo
6:00 am - 3:03 pmONT-BIL
8h 03m1 stop
$525Hawaiian Airlines
Find Deal
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.

What’s the cheapest day of the week to fly from Billings to Ontario?

The average price of all round-trip flights from Billings to Ontario clicked on KAYAK for each day over the last 12 months.

For Billings to Ontario, Monday is the cheapest day to fly on average and Friday is the most expensive. Flying from Ontario back to Billings, the best deals are generally found on Friday, with Monday being the most expensive.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Billings to Ontario, 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 Billings to Ontario is November, where tickets cost $255 (return) on average. On the other hand, the most expensive months are July and December, where the average cost of round-trip tickets is $524 and $494 respectively.

Good to know

Low seasonJuly
Cheapest flight$164
Best time to beat the crowds but there is an average 43% increase in price.
Most popular time to fly and prices are also 29% lower on average.
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 $164 for a one-way ticket and $240 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?

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

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

    The two airlines most popular with KAYAK users for flights from Billings to Ontario are Delta and Alaska Airlines. With an average price for the route of $345 and an overall rating of 8.0, Delta is the most popular choice. Alaska Airlines is also a great choice for the route, with an average price of $263 and an overall rating of 8.0.

  • 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.
8.0
Alaska AirlinesOverall score based on 10000 reviews
8.5Crew
7.1Food
8.1Boarding
7.8Comfort
7.0Entertainment
Airline reviews

I liked the crew. There was no food flight to short

6.0 GoodTony, Aug 2025BUR - SFO
Read more Alaska Airlines reviews

I liked the crew. There was no food flight to short

I like the friendliness of the staff. The food choices were OK. I wish there was more options. The entertainment through the movie portal was alright.

Good experience on flight. But flight was delayed for takeoff by an hour, and Alaska posted the wrong landing time on its website. So the person who was designated to pick me up arrived 1 hour early and sat waiting for a long time at 11pm at night. This could have been avoided with better text and website communication by Alaska/Hawaiin Airlines

2 FLIGHT DELAYS? what an inconvenience to stay @the airport HALF THE DAY😳from 1pm till boarding @ 4pm pass 😠exhausting !

There was a very drunk man behind me who kept talking loudly to no one in particular. He was slurring his words and at times he didn’t know where we were going or whether or not we landed. He was also loudly using a lot of profanity. The attendants didn’t seem to notice or care and in fact continued to serve him alcohol. He was allowed to purchase 4 little bottles.

Loved the staff ease of flying snacks and free movies and WiFi

boarding was late worst was going back LAX to SFO delayed not once ? but TWICE😡I was at the airport practically almost 5 hours of previous time , very inconvenient! i would have spend longer time with family , I was wanting to avoid TSA line? but it just got me to spend unwanted time @ d airport

Flight was delayed - we left at 11:30 pm instead of 10:30 and it was extremely inconvenient. It affected both the day of the flight and the next day

I have mobility problems and requested wheelchair assistance in Seattle and Anchorage and none was provided at all. Very disappointed. Only one gate agent in Seattle asked if I needed assistance boarding my flight in Seattle.... and only after three gate changes.... requiring even more extremely painful walking without assistance.

Very pleasant , a flight attendant Jo did a great job mixing me up a beverage and just brightened the trip .

I was uncomfortably cold on the plane. Other than that it was uneventful and therefore as enjoyable as a plane ride can be.

Food was surprisingly good but the WiFi was not great

My flight was extremely cold. I had a jacket and a cover was left in each seat. The cover was extremely thin and I have a disability, fibromyalgia and arthrithis and AC air is the worst. I closed my vent and my husbands vent and it still was frigid. I asked the attendant if I could get another cover and she quickly almost dismissively and totally unconcerned stating, (I quote) (one per chair) and walked off so quickly that I didn't get a chance to explain to her that I literally have adisability. I didnt want to make a seen so I set on that flight for over 5 hours in pain, joints locking up and extremely uncomfortable. When my fibromyalgia flares up my joints not only ache but they will lock up also and it takes me days to get back to my regular self even though I take medication for it. I felt like it would not have hurt anyone at all for her to just give me an extra cover because I'm sure they have all types of medical issues in people that fly every day.

Not a "Delta" issue, but a JFK issue: We booked a connecting flight with 3 1/2 hours between to clearn immigration and customs. Our inbound flight (BCN to JFK) was on the taxiway 45 minutes which ate into our layover time. Immigtration was insanely quick with the CBP MPC app; however, clearing TSA (again, after we were ALREADY cleared in Spain on the inbound international flight) took over 95 minutes. This left us with 10 minutes before boarding the connecting flight (JFK to SAN) to walk to the far end of Terminal 4 and try to find food. We didn't find any food that could promise to serve us in under 10 minutes so we boarded the Delta flight after coming off a plance and an 8-hour flight knowing that we wouldn't be served any food on the next 5 1/2 hour flight. I feel like Delta needs to put pressure on the JFK TSA to open more screening stations (by our count, we saw only 5 scanners open and a line of - as we said - over 90 minutes. The insult is that we WERE ALREADY SCREENED through TSA, but as you come off one flight into the USA, you have to go through the whole process again. It seems like if you have a connecting flight, there should be a way to pass through immigration and customs without needing to return through TSA.

There are 4 flights in consecutive gates with about the same departure time. Two flights were boarding at the same time. One was delayed or boarding would be happening at the same time. I am not sure what Delta and LAX need to do to have a better layout at the end of Terminal 2

5 hours of delay that could've been much shorter if Delta had taken the 1 hour delay they imposed on the flight before boarding to run any of the plane checks required for flight to find the hydraulic issue that required nearly 3 hours to fix. $24 of meal credit buys a sandwich and a soft drink. Poor communication within the terminal about what gate we'd be re-boarding from and when we'd be re-boarding.

The entertainment and wifi mostly didn't work on this flight.

Terrible entertainment system - kept freezing and audio kept cutting out. Snacks were mediocre at best for a 5 hour flight.

I am still upset that my bag was lost on a recent trip to Rome ; we were inconvenienced and out €150 Euros ; delta has refused to reimburse us

This had nothing to do with Delta… The flights were on time and flawless. The service was excellent. We purchased seats in (aisle/middle) comfort plus since this was a cross country flight. Unfortunately, the woman seated at the window was 300+ pounds and, as might be expected, covered up about a third of the middle seat also. there was absolutely nothing that Delta could have done about that… I just don’t know what the answer should be. If you purchase a seat, you should should be able to use the entire seat and not just the portion that someone else is not sitting/oozing in. Disappointing…there should be something that could be done….I'm just not sure what solution could be.

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

Information on your arrival and departure airports

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.