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Cheap flights from Boston to Los Angeles from $127

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 8/14. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Boston to Los Angeles

Cheap round-trip flights

Enter your travel dates to find the best prices.
JetBlue Logo
4:43 pm - 10:05 pm
BOS
-
ONT
8h 22m
1 stop
JetBlue Logo
9:10 pm - 10:46 am
ONT
-
BOS
10h 36m
1 stop
$372JetBlue
Sat, Sep 5 - Wed, Sep 9
JetBlue Logo
2:45 pm - 10:35 pm
BOS
-
ONT
10h 50m
1 stop
JetBlue Logo
11:50 pm - 11:16 am
ONT
-
BOS
8h 26m
1 stop
$377JetBlue
Tue, Aug 4 - Wed, Aug 12
Southwest Logo
7:05 am - 2:25 pm
BOS
-
ONT
10h 20m
2 stops
Southwest Logo
11:55 pm - 11:55 am
ONT
-
BOS
9h 00m
1 stop
$378Southwest
Wed, Dec 2 - Sun, Dec 6
Southwest Logo
9:25 am - 4:05 pm
BOS
-
ONT
9h 40m
2 stops
Southwest Logo
8:35 am - 9:25 pm
ONT
-
BOS
9h 50m
2 stops
$379Southwest
Wed, Aug 19 - Wed, Aug 26
JetBlue Logo
2:45 pm - 10:35 pm
BOS
-
ONT
10h 50m
1 stop
JetBlue Logo
11:24 pm - 11:21 am
ONT
-
BOS
8h 57m
1 stop
$380JetBlue
Tue, Aug 11 - Sat, Aug 15
Southwest Logo
3:50 pm - 10:35 pm
BOS
-
ONT
9h 45m
2 stops
Southwest Logo
11:55 pm - 11:35 am
ONT
-
BOS
8h 40m
1 stop
$382Southwest
Thu, Oct 22 - Mon, Oct 26
Delta Logo
12:30 pm - 6:30 pm
BOS
-
ONT
9h 00m
1 stop
Delta Logo
10:00 pm - 9:39 am
ONT
-
BOS
8h 39m
1 stop
$383Delta
Sat, Jul 4 - Mon, Jul 13
Delta Logo
12:30 pm - 6:30 pm
BOS
-
ONT
9h 00m
1 stop
Delta Logo
10:00 pm - 9:39 am
ONT
-
BOS
8h 39m
1 stop
$384Delta
Sat, Jul 4 - Mon, Jul 13
JetBlue Logo
4:31 pm - 10:35 pm
BOS
-
ONT
9h 04m
1 stop
JetBlue Logo
11:58 pm - 11:33 am
ONT
-
BOS
8h 35m
1 stop
$385JetBlue
Wed, Jul 29 - Sun, Aug 2
Alaska Airlines Logo
7:12 am - 2:16 pm
BOS
-
ONT
10h 04m
1 stop
Alaska Airlines Logo
7:12 am - 6:09 am
ONT
-
BOS
19h 57m
1 stop
$386Alaska Airlines
Wed, Sep 16 - Wed, Sep 30

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Southwest flights from Boston to Ontario

Our best Southwest deals on Boston to Ontario flight tickets
Southwest
Dec 2
BOS7:05 amBoston Logan Intl
10h 20m
2 stops
ONT2:25 pmOntario
Dec 6
ONT11:55 pmOntario
9h 00m
1 stop
BOS11:55 amBoston Logan Intl
$378
Southwest
Aug 19
BOS9:25 amBoston Logan Intl
9h 40m
2 stops
ONT4:05 pmOntario
Aug 26
ONT8:35 amOntario
9h 50m
2 stops
BOS9:25 pmBoston Logan Intl
$379
Southwest
Oct 22
BOS3:50 pmBoston Logan Intl
9h 45m
2 stops
ONT10:35 pmOntario
Oct 26
ONT11:55 pmOntario
8h 40m
1 stop
BOS11:35 amBoston Logan Intl
$382

United Airlines flights from Boston to Ontario

Our best United Airlines deals on Boston to Ontario flight tickets
United Airlines
Jun 27
BOS5:00 pmBoston Logan Intl
8h 51m
1 stop
ONT10:51 pmOntario
Jan 29
ONT6:53 pmOntario
10h 30m
1 stop
BOS8:23 amBoston Logan Intl
$411
United Airlines
Jun 30
BOS9:07 amBoston Logan Intl
9h 22m
1 stop
ONT3:29 pmOntario
Jul 4
ONT6:10 amOntario
8h 21m
1 stop
BOS5:31 pmBoston Logan Intl
$437
United Airlines
Jun 29
BOS6:00 amBoston Logan Intl
9h 12m
1 stop
ONT12:12 pmOntario
Jul 3
ONT6:10 amOntario
12h 43m
2 stops
BOS9:53 pmBoston Logan Intl
$442

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 18, 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

Sat 9/5

4:43 pm-10:05 pm

1 stop8h 22m

Ontario

Wed 9/9

9:10 pm-10:46 am

1 stop10h 36m

$372

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 8/4

2:45 pm-10:35 pm

1 stop10h 50m

Ontario

Wed 8/12

11:50 pm-11:16 am

1 stop8h 26m

$377

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 12/2

7:05 am-2:25 pm

2 stops10h 20m

Ontario

Sun 12/6

11:55 pm-11:55 am

1 stop9h 00m

$378

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 8/19

9:25 am-4:05 pm

2 stops9h 40m

Ontario

Wed 8/26

8:35 am-9:25 pm

2 stops9h 50m

$379

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 8/11

2:45 pm-10:35 pm

1 stop10h 50m

Ontario

Sat 8/15

11:24 pm-11:21 am

1 stop8h 57m

$380

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 10/22

3:50 pm-10:35 pm

2 stops9h 45m

Ontario

Mon 10/26

11:55 pm-11:35 am

1 stop8h 40m

$382
Quickest round-trip

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sat 7/4

12:30 pm-6:30 pm

1 stop9h 00m

Ontario

Mon 7/13

10:00 pm-9:39 am

1 stop8h 39m

$383

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sat 7/4

12:30 pm-6:30 pm

1 stop9h 00m

Ontario

Mon 7/13

10:00 pm-9:39 am

1 stop8h 39m

$384

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 7/29

4:31 pm-10:35 pm

1 stop9h 04m

Ontario

Sun 8/2

11:58 pm-11:33 am

1 stop8h 35m

$385

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 9/16

7:12 am-2:16 pm

1 stop10h 04m

Ontario

Wed 9/30

7:12 am-6:09 am

1 stop19h 57m

$386

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 $490 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 $332 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

8h 33m

Direct flights

None
The fastest flight from Boston to Ontario takes 8h 33m
There are no direct flights from Boston to Ontario. There are no popular flight routes from Boston to Ontario.
Search flight deals

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 8h 33m.

  • 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 $158Free CancellationRating
7.8
8,410 reviews
Search Delta flights
United AirlinesPriceFrom $239Free CancellationRating
7.4
9,860 reviews
Search United Airlines flights
American AirlinesPriceFrom $259Free CancellationRating
7.1
11,688 reviews
Search American Airlines flights
SouthwestPriceFrom $305Free CancellationRating
7.9
4,236 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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