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Cheap flights from Boston to Los Angeles from $129

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 8/20. 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.
Delta Logo
6:05 am - 12:16 pm
BOS
-
ONT
9h 11m
1 stop
Delta Logo
5:05 pm - 6:30 am
ONT
-
BOS
10h 25m
1 stop
$297Delta
Wed, Aug 19 - Sat, Aug 29
United Airlines Logo
6:00 am - 12:12 pm
BOS
-
ONT
9h 12m
1 stop
United Airlines Logo
11:00 am - 11:59 pm
ONT
-
BOS
9h 59m
2 stops
$302United Airlines
Thu, Sep 3 - Sat, Sep 5
American Airlines Logo
6:45 am - 1:31 pm
BOS
-
ONT
9h 46m
1 stop
American Airlines Logo
12:59 pm - 11:24 pm
ONT
-
BOS
7h 25m
1 stop
$303American Airlines
Thu, Aug 20 - Mon, Aug 24
Delta Logo
6:05 am - 12:14 pm
BOS
-
ONT
9h 09m
1 stop
Delta Logo
6:00 pm - 7:40 am
ONT
-
BOS
10h 40m
1 stop
$317Delta
Tue, Sep 8 - Mon, Sep 14
American Airlines Logo
6:45 am - 11:43 am
BOS
-
ONT
7h 58m
1 stop
American Airlines Logo
12:37 pm - 11:25 pm
ONT
-
BOS
7h 48m
1 stop
$318American Airlines
Sat, Sep 5 - Tue, Sep 15
Delta Logo
7:53 am - 5:21 pm
BOS
-
ONT
12h 28m
1 stop
Delta Logo
1:00 pm - 11:47 pm
ONT
-
BOS
7h 47m
1 stop
$320Delta
Thu, Jul 23 - Tue, Jul 28
Southwest Logo
2:10 pm - 6:55 pm
BOS
-
ONT
7h 45m
1 stop
Southwest Logo
7:45 am - 9:20 pm
ONT
-
BOS
10h 35m
2 stops
$322Southwest
Wed, Aug 19 - Wed, Aug 26
Delta Logo
6:05 am - 12:16 pm
BOS
-
ONT
9h 11m
1 stop
Delta Logo
12:00 pm - 1:25 am
ONT
-
BOS
10h 25m
1 stop
$328Delta
Thu, Aug 20 - Wed, Sep 2
Southwest Logo
12:40 pm - 8:40 pm
BOS
-
ONT
11h 00m
2 stops
Southwest Logo
1:50 pm - 12:05 am
ONT
-
BOS
7h 15m
1 stop
$333Southwest
Fri, Aug 21 - Tue, Aug 25
United Airlines Logo
5:00 pm - 10:51 pm
BOS
-
ONT
8h 51m
1 stop
United Airlines Logo
1:50 pm - 1:11 am
ONT
-
BOS
8h 21m
1 stop
$336United Airlines
Fri, Jul 17 - Tue, Jul 28

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American Airlines flights from Boston to Ontario

Our best American Airlines deals on Boston to Ontario flight tickets
American Airlines
Aug 20
BOS6:45 amBoston Logan Intl
9h 46m
1 stop
ONT1:31 pmOntario
Aug 24
ONT12:59 pmOntario
7h 25m
1 stop
BOS11:24 pmBoston Logan Intl
$303
American Airlines
Sep 5
BOS6:45 amBoston Logan Intl
7h 58m
1 stop
ONT11:43 amOntario
Sep 15
ONT12:37 pmOntario
7h 48m
1 stop
BOS11:25 pmBoston Logan Intl
$318
American Airlines
Aug 13
BOS6:45 amBoston Logan Intl
7h 58m
1 stop
ONT11:43 amOntario
Aug 19
ONT12:59 pmOntario
7h 25m
1 stop
BOS11:24 pmBoston Logan Intl
$338

Southwest flights from Boston to Ontario

Our best Southwest deals on Boston to Ontario flight tickets
Southwest
Aug 19
BOS2:10 pmBoston Logan Intl
7h 45m
1 stop
ONT6:55 pmOntario
Aug 26
ONT7:45 amOntario
10h 35m
2 stops
BOS9:20 pmBoston Logan Intl
$322
Southwest
Aug 21
BOS12:40 pmBoston Logan Intl
11h 00m
2 stops
ONT8:40 pmOntario
Aug 25
ONT1:50 pmOntario
7h 15m
1 stop
BOS12:05 amBoston Logan Intl
$333
Southwest
Aug 13
BOS5:00 amBoston Logan Intl
10h 00m
2 stops
ONT12:00 pmOntario
Aug 19
ONT7:25 amOntario
11h 45m
1 stop
BOS10:10 pmBoston Logan Intl
$339

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 July 6, 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 8/19

6:05 am-12:16 pm

1 stop9h 11m

Ontario

Sat 8/29

5:05 pm-6:30 am

1 stop10h 25m

$297

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 9/3

6:00 am-12:12 pm

1 stop9h 12m

Ontario

Sat 9/5

11:00 am-11:59 pm

2 stops9h 59m

$302

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 8/20

6:45 am-1:31 pm

1 stop9h 46m

Ontario

Mon 8/24

12:59 pm-11:24 pm

1 stop7h 25m

$303

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 9/8

6:05 am-12:14 pm

1 stop9h 09m

Ontario

Mon 9/14

6:00 pm-7:40 am

1 stop10h 40m

$317
Quickest round-trip

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sat 9/5

6:45 am-11:43 am

1 stop7h 58m

Ontario

Tue 9/15

12:37 pm-11:25 pm

1 stop7h 48m

$318

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 7/23

7:53 am-5:21 pm

1 stop12h 28m

Ontario

Tue 7/28

1:00 pm-11:47 pm

1 stop7h 47m

$320

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 8/19

2:10 pm-6:55 pm

1 stop7h 45m

Ontario

Wed 8/26

7:45 am-9:20 pm

2 stops10h 35m

$322

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 8/20

6:05 am-12:16 pm

1 stop9h 11m

Ontario

Wed 9/2

12:00 pm-1:25 am

1 stop10h 25m

$328

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Fri 8/21

12:40 pm-8:40 pm

2 stops11h 00m

Ontario

Tue 8/25

1:50 pm-12:05 am

1 stop7h 15m

$333

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Fri 7/17

5:00 pm-10:51 pm

1 stop8h 51m

Ontario

Tue 7/28

1:50 pm-1:11 am

1 stop8h 21m

$336

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 $481 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 $352 on momondo.

How have Boston to Ontario flight prices changed over time?

As of July 2026, prices for Boston to Ontario flights are approximately 25% more expensive 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 56m

Direct flights

None
The fastest flight from Boston to Ontario takes 7h 56m
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 56m.

  • 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 $233Free CancellationRating
7.8
8,452 reviews
Search Delta flights
United AirlinesPriceFrom $239Free CancellationRating
7.4
9,940 reviews
Search United Airlines flights
American AirlinesPriceFrom $259Free CancellationRating
7.1
11,782 reviews
Search American Airlines flights
JetBluePriceFrom $298Free CancellationRating
7.1
3,009 reviews
Search JetBlue flights
SouthwestPriceFrom $305Free CancellationRating
7.9
4,252 reviews
Search Southwest 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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