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Cheap flights from Boston to Los Angeles from $134

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Boston to Los Angeles departing on 9/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Boston to Los Angeles

Cheap round-trip flights

Enter your travel dates to find the best prices.
Southwest Logo
10:45 am - 5:45 pm
BOS
-
ONT
10h 00m
1 stop
Southwest Logo
11:55 pm - 12:40 pm
ONT
-
BOS
9h 45m
2 stops
$364Southwest
Wed, Oct 14 - Mon, Oct 19
Southwest Logo
4:45 pm - 10:00 pm
BOS
-
ONT
8h 15m
1 stop
Southwest Logo
11:55 pm - 11:25 am
ONT
-
BOS
8h 30m
1 stop
$367Southwest
Tue, Aug 18 - Sat, Aug 22
Delta Logo
6:05 am - 12:10 pm
BOS
-
ONT
9h 05m
1 stop
Delta Logo
5:10 pm - 6:05 am
ONT
-
BOS
9h 55m
1 stop
$368Delta
Wed, Jul 22 - Sat, Aug 1
Southwest Logo
2:45 pm - 10:00 pm
BOS
-
ONT
10h 15m
2 stops
Southwest Logo
7:40 am - 9:25 pm
ONT
-
BOS
10h 45m
2 stops
$369Southwest
Wed, Sep 16 - Wed, Sep 23
Southwest Logo
5:25 am - 1:50 pm
BOS
-
ONT
11h 25m
1 stop
Southwest Logo
5:15 am - 6:00 pm
ONT
-
BOS
9h 45m
2 stops
$371Southwest
Fri, Jul 10 - Tue, Jul 14
Southwest Logo
5:15 am - 12:20 pm
BOS
-
ONT
10h 05m
2 stops
Southwest Logo
5:20 am - 6:00 pm
ONT
-
BOS
9h 40m
2 stops
$373Southwest
Wed, Oct 14 - Mon, Oct 19
Southwest Logo
3:55 pm - 10:25 pm
BOS
-
ONT
9h 30m
1 stop
Southwest Logo
5:30 am - 6:00 pm
ONT
-
BOS
9h 30m
2 stops
$374Southwest
Thu, Jul 9 - Tue, Jul 14
Delta Logo
5:30 am - 10:40 am
BOS
-
ONT
8h 10m
1 stop
Delta Logo
1:00 pm - 11:49 pm
ONT
-
BOS
7h 49m
1 stop
$378Delta
Thu, Jun 11 - Tue, Jun 16
Delta Logo
6:05 am - 12:10 pm
BOS
-
ONT
9h 05m
1 stop
Delta Logo
10:00 pm - 2:23 pm
ONT
-
BOS
13h 23m
2 stops
$380Delta
Tue, Jul 21 - Mon, Jul 27
American Airlines Logo
12:36 pm - 6:21 pm
BOS
-
ONT
8h 45m
1 stop
American Airlines Logo
12:35 pm - 11:59 pm
ONT
-
BOS
8h 24m
1 stop
$383American Airlines
Thu, Jun 25 - Sat, Jul 11

United Airlines flights from Boston to Ontario

Our best United Airlines deals on Boston to Ontario flight tickets
United Airlines
Jun 6
BOS4:15 pmBoston Logan Intl
9h 35m
1 stop
ONT10:50 pmOntario
Jun 10
ONT6:00 amOntario
8h 04m
1 stop
BOS5:04 pmBoston Logan Intl
$378
United Airlines
Jun 6
BOS9:50 amBoston Logan Intl
11h 06m
2 stops
ONT5:56 pmOntario
Jun 10
ONT6:00 amOntario
8h 04m
1 stop
BOS5:04 pmBoston Logan Intl
$383
United Airlines
Jun 13
BOS5:05 pmBoston Logan Intl
8h 46m
1 stop
ONT10:51 pmOntario
Jun 25
ONT6:39 pmOntario
10h 22m
1 stop
BOS8:01 amBoston Logan Intl
$386

Southwest flights from Boston to Ontario

Our best Southwest deals on Boston to Ontario flight tickets
Southwest
Oct 14
BOS10:45 amBoston Logan Intl
10h 00m
1 stop
ONT5:45 pmOntario
Oct 19
ONT11:55 pmOntario
9h 45m
2 stops
BOS12:40 pmBoston Logan Intl
$364
Southwest
Aug 18
BOS4:45 pmBoston Logan Intl
8h 15m
1 stop
ONT10:00 pmOntario
Aug 22
ONT11:55 pmOntario
8h 30m
1 stop
BOS11:25 amBoston Logan Intl
$367
Southwest
Sep 16
BOS2:45 pmBoston Logan Intl
10h 15m
2 stops
ONT10:00 pmOntario
Sep 23
ONT7:40 amOntario
10h 45m
2 stops
BOS9:25 pmBoston Logan Intl
$369

momondo Fare Finder

 
Customize your flight search to find flights from Boston 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, momondo users made 832,500 searches. Data last updated June 1, 2026.
Use the filters below to find and compare flights from Boston to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 10/14

10:45 am-5:45 pm

1 stop10h 00m

Ontario

Mon 10/19

11:55 pm-12:40 pm

2 stops9h 45m

$364

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 8/18

4:45 pm-10:00 pm

1 stop8h 15m

Ontario

Sat 8/22

11:55 pm-11:25 am

1 stop8h 30m

$367

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 7/22

6:05 am-12:10 pm

1 stop9h 05m

Ontario

Sat 8/1

5:10 pm-6:05 am

1 stop9h 55m

$368

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 9/16

2:45 pm-10:00 pm

2 stops10h 15m

Ontario

Wed 9/23

7:40 am-9:25 pm

2 stops10h 45m

$369

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Fri 7/10

5:25 am-1:50 pm

1 stop11h 25m

Ontario

Tue 7/14

5:15 am-6:00 pm

2 stops9h 45m

$371

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 10/14

5:15 am-12:20 pm

2 stops10h 05m

Ontario

Mon 10/19

5:20 am-6:00 pm

2 stops9h 40m

$373

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 7/9

3:55 pm-10:25 pm

1 stop9h 30m

Ontario

Tue 7/14

5:30 am-6:00 pm

2 stops9h 30m

$374
Quickest round-trip

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 6/11

5:30 am-10:40 am

1 stop8h 10m

Ontario

Tue 6/16

1:00 pm-11:49 pm

1 stop7h 49m

$378

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 7/21

6:05 am-12:10 pm

1 stop9h 05m

Ontario

Mon 7/27

10:00 pm-2:23 pm

2 stops13h 23m

$380

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 6/25

12:36 pm-6:21 pm

1 stop8h 45m

Ontario

Sat 7/11

12:35 pm-11:59 pm

1 stop8h 24m

$383

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Los Angeles from

How to get the cheapest flight ticket from Boston to Ontario

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between Boston and Ontario?

What is the cheapest month to fly to Ontario?

In general, February is the cheapest month to fly from Boston to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $317. If you aren’t able to travel during the month of February, then book flights to Ontario from Boston during January instead. Flights to Ontario in January, while not as cheap as those in February, still average around $366.

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

You are more likely to see cheaper flights to Ontario from Boston when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $472 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from Boston for as low as $345 on momondo.

How have Boston to Ontario flight prices changed over time?

As of June 2026, prices for Boston to Ontario flights are approximately 4% cheaper when compared to flights at the same time last year.

When to book flights from Boston to Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from Boston to Ontario according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Boston to Ontario (BOS to ONT) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Boston to Ontario

Fastest flight time

7h 45m

Direct flights

None
The fastest flight from Boston to Ontario takes 7h 45m
There are no direct flights from Boston to Ontario. There are no popular flight routes from Boston to Ontario.
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Frequently asked questions about flying from Boston to Ontario

  • How far is Boston Logan Intl to Ontario by plane?

    The distance between Boston Logan Intl and Ontario is about 2558.5 mi. A reasonable flight in good conditions will take 7h 45m.

  • When did momondo last update prices for flights from Boston Logan Intl Airport to Ontario Airport?

    Prices for flights from Boston Logan Intl Airport to Ontario Airport are updated daily.

  • How many operators does momondo search for flights from Boston Logan Intl Airport to Ontario Airport?

  • How old do you have to be to fly from Boston Logan Intl Airport to Ontario Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Boston Logan Intl Airport to Ontario Airport.

  • What documentation or ID do you need to fly to Ontario Airport?

    The required travel and health documents for your Ontario Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Ontario Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular airline from Boston to Ontario?

Best airlines flying from Boston to Ontario

Compare and see reviews for airlines that fly from Boston to Ontario with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $149Free CancellationRating
7.9
8,401 reviews
Search Delta flights
United AirlinesPriceFrom $239Free CancellationRating
7.4
9,771 reviews
Search United Airlines flights
American AirlinesPriceFrom $259Free CancellationRating
7.1
11,643 reviews
Search American Airlines flights
SouthwestPriceFrom $305Free CancellationRating
8.0
4,256 reviews
Search Southwest flights
JetBluePriceFrom $319Free CancellationRating
7.1
2,984 reviews
Search JetBlue flights

Why use momondo?

Why should I use momondo to find a flight deal from Boston to Ontario?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Ontario from Boston.

Can I find flights from Boston to Ontario with flexible booking policies on momondo?

momondo does allow users to show only those flights to Ontario from Boston which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Boston to Ontario?

momondo provides multiple filters to help you find the best flight to Ontario from Boston. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Boston to Ontario right now. Can momondo alert me if prices change?

Price alerts on flights to Ontario from Boston are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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