BOS - ONT

$98 Find Cheap Flights from Boston 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 Boston to Ontario departing on 4/24. 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.
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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 Boston 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 Boston to Ontario, as well as popular online travel agencies
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Cheap Flights from Boston to Ontario

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

Recent round-trip flight deals from Boston to Ontario

KAYAK's recommended round-trip deals from the most popular airlines that fly from Boston to Ontario.
Discover the best prices for you by selecting your travel dates on KAYAK.
Choose your dates
United Airlines Logo
11:42 am - 5:27 pmBOS-ONT
8h 45m1 stop
United Airlines Logo
6:41 pm - 8:08 amONT-BOS
10h 27m1 stop
$269United Airlines
Find Deal
Sat, May 24 - Wed, May 28
Frontier Logo
12:29 pm - 6:40 pmBOS-ONT
9h 11m1 stop
Frontier Logo
6:47 pm - 12:07 pmONT-BOS
14h 20m1 stop
$270Frontier
Find Deal
Sun, Apr 27 - Wed, May 7
JetBlue Logo
2:45 pm - 9:25 pmBOS-ONT
9h 40m1 stop
JetBlue Logo
10:40 pm - 9:28 amONT-BOS
7h 48m1 stop
$291JetBlue
Find Deal
Thu, May 1 - Sun, May 4
JetBlue Logo
3:10 pm - 9:11 pmBOS-ONT
9h 01m1 stop
JetBlue Logo
10:59 pm - 11:42 amONT-BOS
9h 43m1 stop
$311JetBlue
Find Deal
Wed, May 7 - Thu, May 8
American Airlines Logo
5:35 am - 11:50 amBOS-ONT
9h 15m1 stop
American Airlines Logo
7:25 pm - 6:00 amONT-BOS
7h 35m1 stop
$313American Airlines
Find Deal
Sat, May 17 - Sat, May 31
Delta Logo
6:39 pm - 11:41 pmBOS-ONT
8h 02m1 stop
Delta Logo
1:20 pm - 12:12 amONT-BOS
7h 52m1 stop
$318Delta
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Wed, Apr 30 - Mon, May 5
Delta Logo
4:25 pm - 10:05 pmBOS-ONT
8h 40m1 stop
Delta Logo
10:15 pm - 9:32 amONT-BOS
8h 17m1 stop
$327Delta
Find Deal
Sat, Apr 26 - Tue, Apr 29
American Airlines Logo
10:46 am - 6:23 pmBOS-ONT
10h 37m2 stops
American Airlines Logo
10:40 pm - 9:20 amONT-BOS
7h 40m1 stop
$357American Airlines
Find Deal
Tue, May 13 - Mon, May 19
Southwest Logo
5:50 am - 2:00 pmBOS-ONT
11h 10m2 stops
Southwest Logo
8:45 pm - 9:15 amONT-BOS
9h 30m2 stops
$417Southwest
Find Deal
Wed, May 21 - Wed, Jun 4
Southwest Logo
4:40 pm - 11:00 pmBOS-ONT
9h 20m2 stops
Southwest Logo
1:05 pm - 11:10 pmONT-BOS
7h 05m1 stop
$432Southwest
Find Deal
Mon, May 12 - Wed, May 14

KAYAK's insights & trends for Boston to Ontario flights

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

Planning a trip from Boston to Ontario? KAYAK’s data-powered insights will help you find cheap flights. Learn the best time to fly, how early to book your ticket, and other tips to secure great prices.

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

The average price of all round-trip flights from Boston to Ontario clicked on KAYAK for each day over the last 12 months.
If your flying dates are flexible, you should consider flying to Ontario on a Tuesday, as we generally find the cheapest rates on that day for this route. On the other hand, Sunday is the most expensive day to fly from Boston to Ontario. For your return ticket, we recommend flying on a Tuesday and avoiding Sundays for the best deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Boston 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 Boston to Ontario is January, where tickets cost $350 (return) on average. On the other hand, the most expensive months are October and December, where the average cost of round-trip tickets is $591 and $568 respectively.

How far in advance should I book a flight from Boston to Ontario?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Boston to Ontario, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.
To get a below average price on the flight from Boston to Ontario, you should book around 3 weeks before departure. For the absolute cheapest price, our data suggests you should book 26 weeks before departure.

Good to know

Low season

February

High season

May

Cheapest flight

$98
Best time to beat the crowds with an average 5% drop in price.
Most popular time to fly and prices are also 14% lower on average.
Flight from Boston to Ontario

When to book flights from Boston to Ontario

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

  • What is the cheapest flight from Boston to Ontario?

    In the last 3 days, the lowest price for a flight from Boston to Ontario was $98 for a one-way ticket and $269 for a round-trip.

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

    A passport is not required to fly from Boston to Ontario.

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

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

  • Which airline alliances offer flights from Boston to Ontario?

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

  • What is the most popular layover when flying to Ontario from Boston?

    Dallas is the most popular layover city among KAYAK users traveling from Boston to Ontario.

  • Which is the best airline for flights from Boston to Ontario, Southwest or Delta?

    The two airlines most popular with KAYAK users for flights from Boston to Ontario are Southwest and Delta. With an average price for the route of $460 and an overall rating of 8.0, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $446 and an overall rating of 8.0.

  • How does KAYAK find such low prices on flights from Boston 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 Boston to Ontario.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Boston 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 Boston 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 Boston with another airline. Booking your flights between Boston 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 Boston 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 Boston up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top 5 airlines serving from Boston to Ontario

 
See real verified KAYAK customer reviews for airlines flying from Boston 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 Boston 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
SouthwestOverall score based on 4281 reviews
8.2Boarding
8.6Crew
8.0Comfort
7.6Entertainment
7.1Food
Airline reviews

It was a perfect flight in all aspects! Both legs!

10.0 ExcellentAnonymous, Apr 2025LGB - SMF
Read more Southwest reviews

It was a perfect flight in all aspects! Both legs!

Boarding process, crew were good. But the seats were so uncomfortable that was all I could focus on. I literally had to sit forward so that all 3 of us could fit in row. I will try to avoid Southwest in the future for any flights over 60 minutes.

Great flight, 47 passengers on a 180 seat plane. Stewardess was pleasant and cheerful.

Great experience flying Southwest. The crew was really kind and helpful, and very friendly with our toddler.

Plane late from DC to Austin 30 minutes. Crew made up much of the time enroute to San Diego.

Fine, but how to board on SW versus othrr airlines, is just lame. Goood staff though and all was solid otherwise.

Was as expected. Crowed planes. Too many carryons delaying takeoff. But the ride only took an hour and saved me a lot of time SFO is a not a great airport.

Was as expected. Crowed planes. Too many carryons delaying takeoff. But the ride only took an hour and saved me a lot of time SFO is a hell hole of an airport. It is the new LaGuardia. Everything Cobbled together. Security gates closed. Terri directional signage

I will be flying again Southwest Airlines. Friendly crew, comfortable and affordable.

The plane arrived 25 minutes late, and the Wi-Fi was slower than it usually is.

Seats are much much more comfortable than United, which is what I usually fly

Logan airport construction meant that boarding was chaotic crowded and delayed

If I pay extra for "comfort+" I expect leg room where I can stretch my legs. I was seated with an attendant's seat blocking my feet. Knee space was fine but my feet had less room than the non-"comfort+" seats. Also, don't go cheap on food when you have flights of 3+ hours. It's insulting.

Only one side of the heafphone jack work. Crew was friendly and helpful.

Great. Flight departed early and arrived early. Deplaning and baggage claim ww were quick.

Don't waste your money or points on first class. Delta first class is a joke. The seats were rickety, the food was awful, and nothing worked, wifi, my light, the power plug - and it was dirty - the fold out table was gross. For 2-3 hours, tough it out in Economy.

They separated our seats and moved us to the back of the plane. Hundreds of dollars and thousands of miles used and this was my platinum member experience.

Flight was changed from departing from Boston to departing from Detroit.

AC barely worked on a 50 minute flight. It was very warm the whole flight. Flight was very bumpy and hard landing.

Got on the plane and then needed to deboard the plane because they didn’t have any pilots?

The gate was too far away for the connecting flight

Generally good. The aisles have gotten narrower which can slow down boarding. Flight crew was great! Healthier complimentary snacks would be appreciated. Due to earthquake in San Francisco we had to circle in air space for a bit but then had a smooth landing. I laud the flight crew for their patience ;)

The agents was very rude and they charged me $50 for a carry-on bag saying that it was too big and then I saw someone going on a plane with the same size bag as me

For the most part united was a good experience, how ever when they came by with the snacks and water, they completely passed by my wife and I. As we were in separate rows. On a 5 hr flight we were not offered water

Fantastic crew. Flight was delayed at last minute but we were given updates every 20 minutes and the crew was so friendly and considerate. I miss the touch screens on the back of the seats, wish they would bring that back though.

Awful. Worst airline I have ever been on. Crew were among the rudest people I have ever dealt with. United staff members were rude and disrespectful. My flight was delayed, causing me to miss a connecting flight. I understand things happen, but when staff start lying about what actually happened, that is when I have an issue. Just be honest, really it isn’t that hard. I’m being very honest with this review and I don’t find this difficult what so ever. In fact, because of United Airlines, my Christmas holiday was off to a really rocky start. As someone who has traveled across the world, it has only been United that I have had a truly awful experience.

Boarding always seems a bit chaotic. Seat spacing could leave more for leg room.

Not the best. Mean. Didn’t give any value to me being a united silver member and lots of attitude.

Good flight. On time. Boarding and seating was easy. Crew were really friendly, yet professional. Bathroom (by cockpit) was small but serviceable. Some the seats were showing some notable wear & tear, but were comfy. Very happy UA customer. TY! 🤛🏽💗

We arrived early and finally made it to our gate almost an hour after.

Except for the 28 minute delay leaving and the earlier reschedule to a later takeoff time the flight was good.

Loved the leg room and tvs screens on the seats and free WiFi. Wish the price was lower and could save by rebooking

It took 1-1/2 hours to get our luggage after we landed. That to me is unacceptable

The flight was delayed for 4 hours. Once onboard the crew was wonderful.

Overall was excellent. Will definitely us JetBlue in the future.

I rate it is good we had a 4-hour travel delay at one point but JetBlue gave out food vouchers and travel points credits for another flight so they try to make up for it

Smooth boarding and friendly crew. Unfortunately as soon as we boarded the unit that provides air circulation failed. The pilot informed us and requested maintenance technicians to check it out. The plane became uncomfortably warm without any fresh air coming in. Plus the repair delayed our departure. I am glad the maintenance crew were able to fix the problem. I also was without use of my tv monitor for the first 1/3rd of the trip.

Communication with the customer and stay is important. Staff off with a minor inconvenience but it worked out of course. Also this was a very old Mint Class plane. They snuck this one in on us. The updated aircraft are much better.

The flight itself was fine, but the boarding process was extremely frustrating. There is no one scanning boarding passes - passengers just scan themselves and enter the jetway. By the time my husband and I got on the plane and were halfway to our seats they determined there were too many bags on the plane and everything at that point needed to be checked. This created a lot of unnecessary chaos. They should have alerted people before getting on the plane that they would need to start checking bags instead of waiting until people were already on the plane.

The best flight I’ve had in a while. The plane was like 25% capacity, if that. Smoothest boarding and deplaning process I’ve ever experienced. Wish all flights were this smooth.

One bottle of water and a package of cookies for comfort plus. We had to literally beg a flight attendant for an extra bottle of water later in the flight due to feeling dehydrated.

Everything was fine. Flight boarded and departed on time. Seating was spacious enough for my carryon to fit under the seat in front of me. No complaints at all. Flight even arrived early.

Flight boarded from Gate 39 at OGG, the farthest gate in the terminal. There were no Hawaiian themed amenities for the flight. The first class service was mediocre at best; I received not special welcome or recognition as an executive platinum member of American Advantage program. The flight attendants were more concerned with their cell phones than saying "thank you" to the passengers as we disembarked. Fortunately, the flight arrived at LAX a few minutes early.

Bigger seats. Board back to front! Disembark front to back!

Extraordinary service in business class, and very good breakfast and snacks. A really lovely flight.

This flight didn’t happen because AA agents didn’t let us board the flight

Plane was pretty clean, staff was friendly and helpful, flight left about on time arrived early. Took a long time to board and get off the plane - carry on items didn't have enough room so people had to move all around to find places.

The service and food needs to improve to catch up with other international flights

Would have been good to have a meal since it was a 5.5 hour flight

We boarded after several delays due to mechanical failure and a gate change. The seat cushion in the exit row was very compressed and offered no cushion, making the four-hour journey reasonably uncomfortable. The WiFi worked for a few people, but for most, it did not, and you cannot get entertainment unless you can connect—American Airlines flights do not have seatback screens, and you must use your mobile phone.

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

Information on your arrival and departure airports

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