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Cheap flights from Boston to Los Angeles from $125

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 3/2. 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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0 bags

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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.
Alaska Airlines Logo
7:00 am - 3:08 pm
BOS
-
ONT
11h 08m
1 stop
Alaska Airlines Logo
4:02 pm - 6:54 am
ONT
-
BOS
11h 52m
1 stop
$259Alaska Airlines
Tue, Feb 24 - Thu, Feb 26
American Airlines Logo
12:26 pm - 9:24 pm
BOS
-
ONT
11h 58m
1 stop
American Airlines Logo
11:58 pm - 12:29 pm
ONT
-
BOS
9h 31m
2 stops
$264American Airlines
Fri, Feb 20 - Mon, Feb 23
American Airlines Logo
2:31 pm - 10:07 pm
BOS
-
ONT
10h 36m
2 stops
American Airlines Logo
11:58 pm - 12:29 pm
ONT
-
BOS
9h 31m
2 stops
$270American Airlines
Fri, Feb 20 - Mon, Feb 23
Alaska Airlines Logo
7:00 am - 3:08 pm
BOS
-
ONT
11h 08m
1 stop
Alaska Airlines Logo
11:53 am - 11:54 pm
ONT
-
BOS
9h 01m
1 stop
$278Alaska Airlines
Tue, Feb 3 - Tue, Feb 10
American Airlines Logo
8:50 am - 4:05 pm
BOS
-
ONT
10h 15m
1 stop
American Airlines Logo
7:05 pm - 5:35 am
ONT
-
BOS
7h 30m
1 stop
$279American Airlines
Mon, Feb 9 - Sun, Feb 15
United Airlines Logo
5:30 am - 12:14 pm
BOS
-
ONT
9h 44m
1 stop
United Airlines Logo
5:10 am - 5:26 pm
ONT
-
BOS
9h 16m
2 stops
$291United Airlines
Wed, Apr 1 - Wed, Apr 8
JetBlue Logo
2:55 pm - 10:09 pm
BOS
-
ONT
10h 14m
1 stop
JetBlue Logo
11:25 pm - 10:38 am
ONT
-
BOS
8h 13m
1 stop
$293JetBlue
Fri, May 15 - Mon, May 18
Delta Logo
7:15 am - 1:54 pm
BOS
-
ONT
9h 39m
1 stop
Delta Logo
10:25 pm - 10:04 am
ONT
-
BOS
8h 39m
1 stop
$297Delta
Thu, Feb 26 - Tue, Mar 10
Alaska Airlines Logo
7:00 am - 3:08 pm
BOS
-
ONT
11h 08m
1 stop
Alaska Airlines Logo
4:02 pm - 6:54 am
ONT
-
BOS
11h 52m
1 stop
$299Alaska Airlines
Tue, Feb 24 - Fri, Feb 27
United Airlines Logo
10:30 am - 8:58 pm
BOS
-
ONT
13h 28m
2 stops
United Airlines Logo
5:05 am - 3:37 pm
ONT
-
BOS
7h 32m
1 stop
$302United Airlines
Wed, Feb 4 - Sat, Feb 7

American Airlines flights from Boston to Ontario

Our best American Airlines deals on Boston to Ontario flight tickets
American Airlines
Feb 20
BOS12:26 pmBoston Logan Intl
11h 58m
1 stop
ONT9:24 pmOntario
Feb 23
ONT11:58 pmOntario
9h 31m
2 stops
BOS12:29 pmBoston Logan Intl
$264
American Airlines
Feb 20
BOS2:31 pmBoston Logan Intl
10h 36m
2 stops
ONT10:07 pmOntario
Feb 23
ONT11:58 pmOntario
9h 31m
2 stops
BOS12:29 pmBoston Logan Intl
$270
American Airlines
Feb 9
BOS8:50 amBoston Logan Intl
10h 15m
1 stop
ONT4:05 pmOntario
Feb 15
ONT7:05 pmOntario
7h 30m
1 stop
BOS5:35 amBoston Logan Intl
$279

Southwest flights from Boston to Ontario

Our best Southwest deals on Boston to Ontario flight tickets
Southwest
Mar 21
BOS5:25 pmBoston Logan Intl
9h 40m
2 stops
ONT12:05 amOntario
Mar 23
ONT11:55 pmOntario
8h 25m
1 stop
BOS11:20 amBoston Logan Intl
$332
Southwest
Mar 20
BOS5:00 amBoston Logan Intl
7h 55m
1 stop
ONT9:55 amOntario
Mar 23
ONT11:55 pmOntario
8h 25m
1 stop
BOS11:20 amBoston Logan Intl
$337
Southwest
Mar 4
BOS5:30 amBoston Logan Intl
13h 35m
2 stops
ONT4:05 pmOntario
Mar 8
ONT9:55 pmOntario
7h 15m
1 stop
BOS8:10 amBoston Logan Intl
$350

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 January 21, 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

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 2/24

7:00 am-3:08 pm

1 stop11h 08m

Ontario

Thu 2/26

4:02 pm-6:54 am

1 stop11h 52m

$259

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Fri 2/20

12:26 pm-9:24 pm

1 stop11h 58m

Ontario

Mon 2/23

11:58 pm-12:29 pm

2 stops9h 31m

$264

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Fri 2/20

2:31 pm-10:07 pm

2 stops10h 36m

Ontario

Mon 2/23

11:58 pm-12:29 pm

2 stops9h 31m

$270

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 2/3

7:00 am-3:08 pm

1 stop11h 08m

Ontario

Tue 2/10

11:53 am-11:54 pm

1 stop9h 01m

$278

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Mon 2/9

8:50 am-4:05 pm

1 stop10h 15m

Ontario

Sun 2/15

7:05 pm-5:35 am

1 stop7h 30m

$279

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 4/1

5:30 am-12:14 pm

1 stop9h 44m

Ontario

Wed 4/8

5:10 am-5:26 pm

2 stops9h 16m

$291

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Fri 5/15

2:55 pm-10:09 pm

1 stop10h 14m

Ontario

Mon 5/18

11:25 pm-10:38 am

1 stop8h 13m

$293

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 2/26

7:15 am-1:54 pm

1 stop9h 39m

Ontario

Tue 3/10

10:25 pm-10:04 am

1 stop8h 39m

$297

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 2/24

7:00 am-3:08 pm

1 stop11h 08m

Ontario

Fri 2/27

4:02 pm-6:54 am

1 stop11h 52m

$299

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 2/4

10:30 am-8:58 pm

2 stops13h 28m

Ontario

Sat 2/7

5:05 am-3:37 pm

1 stop7h 32m

$302

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 cheapest month to fly to Ontario?

In general, May 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 $358. If you aren’t able to travel during the month of May, then book flights to Ontario from Boston during July instead. Flights to Ontario in July, while not as cheap as those in May, still average around $358.

How far in advance should I book a flight 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 $414 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 $296 on momondo.

How have Boston to Ontario flight prices changed over time?

As of January 2026, prices for Boston to Ontario flights are approximately 15% 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 22m

Direct flights

None
The fastest flight from Boston to Ontario takes 8h 22m
There are no direct flights from Boston to Ontario. There are no popular flight routes from Boston to Ontario.
Search flight deals

  • 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 22m.

  • 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
8,087 reviews
Search Delta flights
United AirlinesPriceFrom $239Free CancellationRating
7.4
9,188 reviews
Search United Airlines flights
JetBluePriceFrom $270Free CancellationRating
7.2
2,890 reviews
Search JetBlue flights
American AirlinesPriceFrom $278Free CancellationRating
7.2
11,169 reviews
Search American Airlines flights
SouthwestPriceFrom $328Free CancellationRating
8.0
4,266 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.

An easier way to manage your Ontario trip

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