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Cheap flights from Boston to Los Angeles from $128

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 5/27. 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.
United Airlines Logo
4:15 pm - 10:58 pm
BOS
-
ONT
9h 43m
1 stop
United Airlines Logo
7:00 am - 7:19 pm
ONT
-
BOS
9h 19m
1 stop
$292United Airlines
Fri, Aug 21 - Sat, Aug 22
Alaska Airlines Logo
6:00 am - 2:55 pm
BOS
-
ONT
11h 55m
1 stop
Alaska Airlines Logo
5:57 pm - 6:20 am
ONT
-
BOS
9h 23m
1 stop
$296Alaska Airlines
Sat, May 30 - Sat, Jun 6
Delta Logo
6:00 am - 12:29 pm
BOS
-
ONT
9h 29m
1 stop
Delta Logo
5:05 pm - 6:09 am
ONT
-
BOS
10h 04m
1 stop
$297Delta
Sun, Aug 30 - Sun, Sep 6
Southwest Logo
5:35 am - 10:15 am
BOS
-
ONT
7h 40m
1 stop
Southwest Logo
9:50 am - 11:35 pm
ONT
-
BOS
10h 45m
2 stops
$302Southwest
Wed, Jun 3 - Sat, Jun 6
Southwest Logo
5:35 am - 11:35 am
BOS
-
ONT
9h 00m
2 stops
Southwest Logo
9:50 am - 11:35 pm
ONT
-
BOS
10h 45m
2 stops
$307Southwest
Wed, Jun 3 - Sat, Jun 6
Alaska Airlines Logo
6:00 am - 2:55 pm
BOS
-
ONT
11h 55m
1 stop
Alaska Airlines Logo
5:57 pm - 6:24 am
ONT
-
BOS
9h 27m
1 stop
$309Alaska Airlines
Sat, May 30 - Tue, Jun 2
Alaska Airlines Logo
4:48 pm - 11:58 pm
BOS
-
ONT
10h 10m
1 stop
Alaska Airlines Logo
5:57 pm - 6:21 am
ONT
-
BOS
9h 24m
1 stop
$317Alaska Airlines
Wed, May 13 - Tue, May 19
Delta Logo
12:45 pm - 6:01 pm
BOS
-
ONT
8h 16m
1 stop
Delta Logo
7:00 am - 7:32 pm
ONT
-
BOS
9h 32m
1 stop
$318Delta
Tue, Sep 1 - Tue, Sep 15
American Airlines Logo
7:00 am - 1:28 pm
BOS
-
ONT
9h 28m
1 stop
American Airlines Logo
7:12 pm - 8:41 am
ONT
-
BOS
10h 29m
2 stops
$323American Airlines
Fri, May 29 - Mon, Jun 1
Alaska Airlines Logo
7:20 am - 3:09 pm
BOS
-
ONT
10h 49m
1 stop
Alaska Airlines Logo
5:57 pm - 6:24 am
ONT
-
BOS
9h 27m
1 stop
$325Alaska Airlines
Sun, May 24 - Tue, Jun 2

United Airlines flights from Boston to Ontario

Our best United Airlines deals on Boston to Ontario flight tickets
United Airlines
Aug 21
BOS4:15 pmBoston Logan Intl
9h 43m
1 stop
ONT10:58 pmOntario
Aug 22
ONT7:00 amOntario
9h 19m
1 stop
BOS7:19 pmBoston Logan Intl
$292
United Airlines
Jun 3
BOS10:35 amBoston Logan Intl
9h 53m
2 stops
ONT5:28 pmOntario
Jun 6
ONT6:05 amOntario
8h 24m
1 stop
BOS5:29 pmBoston Logan Intl
$339
United Airlines
Aug 21
BOS12:10 pmBoston Logan Intl
10h 54m
2 stops
ONT8:04 pmOntario
Aug 22
ONT7:00 amOntario
7h 36m
1 stop
BOS5:36 pmBoston Logan Intl
$369

Delta flights from Boston to Ontario

Our best Delta deals on Boston to Ontario flight tickets
Delta
Aug 30
BOS6:00 amBoston Logan Intl
9h 29m
1 stop
ONT12:29 pmOntario
Sep 7
ONT5:05 pmOntario
10h 04m
1 stop
BOS6:09 amBoston Logan Intl
$297
Delta
Sep 1
BOS12:45 pmBoston Logan Intl
8h 16m
1 stop
ONT6:01 pmOntario
Sep 7
ONT5:05 pmOntario
10h 04m
1 stop
BOS6:09 amBoston Logan Intl
$318
Delta
May 23
BOS12:25 pmBoston Logan Intl
9h 11m
1 stop
ONT6:36 pmOntario
May 24
ONT1:29 pmOntario
7h 29m
1 stop
BOS11:58 pmBoston Logan Intl
$357

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 May 3, 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

Fri 8/21

4:15 pm-10:58 pm

1 stop9h 43m

Ontario

Sat 8/22

7:00 am-7:19 pm

1 stop9h 19m

$292

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sat 5/30

6:00 am-2:55 pm

1 stop11h 55m

Ontario

Sat 6/6

5:57 pm-6:20 am

1 stop9h 23m

$296

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sun 8/30

6:00 am-12:29 pm

1 stop9h 29m

Ontario

Sun 9/6

5:05 pm-6:09 am

1 stop10h 04m

$297

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 6/3

5:35 am-10:15 am

1 stop7h 40m

Ontario

Sat 6/6

9:50 am-11:35 pm

2 stops10h 45m

$302

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 6/3

5:35 am-11:35 am

2 stops9h 00m

Ontario

Sat 6/6

9:50 am-11:35 pm

2 stops10h 45m

$307

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sat 5/30

6:00 am-2:55 pm

1 stop11h 55m

Ontario

Tue 6/2

5:57 pm-6:24 am

1 stop9h 27m

$309

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 5/13

4:48 pm-11:58 pm

1 stop10h 10m

Ontario

Tue 5/19

5:57 pm-6:21 am

1 stop9h 24m

$317
Quickest round-trip

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 9/1

12:45 pm-6:01 pm

1 stop8h 16m

Ontario

Tue 9/15

7:00 am-7:32 pm

1 stop9h 32m

$318

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Fri 5/29

7:00 am-1:28 pm

1 stop9h 28m

Ontario

Mon 6/1

7:12 pm-8:41 am

2 stops10h 29m

$323

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sun 5/24

7:20 am-3:09 pm

1 stop10h 49m

Ontario

Tue 6/2

5:57 pm-6:24 am

1 stop9h 27m

$325

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 $429 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 $276 on momondo.

How have Boston to Ontario flight prices changed over time?

As of May 2026, prices for Boston to Ontario flights are approximately 9% 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 49m

Direct flights

None
The fastest flight from Boston to Ontario takes 7h 49m
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 7h 49m.

  • 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 $148Free CancellationRating
7.9
8,460 reviews
Search Delta flights
United AirlinesPriceFrom $239Free CancellationRating
7.4
9,682 reviews
Search United Airlines flights
American AirlinesPriceFrom $258Free CancellationRating
7.1
11,672 reviews
Search American Airlines flights
SouthwestPriceFrom $297Free CancellationRating
8.0
4,312 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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