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Cheap flights from Boston to Los Angeles from $119

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 1/25. 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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Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
7:15 am - 1:56 pm
BOS
-
ONT
9h 41m1 stop
Delta Logo
3:30 pm - 6:50 am
ONT
-
BOS
12h 20m1 stop
$237Delta
Sat, Jan 24 - Sat, Jan 31
United Airlines Logo
6:00 am - 12:47 pm
BOS
-
ONT
9h 47m2 stops
United Airlines Logo
1:24 pm - 11:52 pm
ONT
-
BOS
7h 28m1 stop
$242United Airlines
Sat, Jan 24 - Sat, Jan 31
United Airlines Logo
6:00 am - 12:47 pm
BOS
-
ONT
9h 47m2 stops
United Airlines Logo
5:05 am - 5:24 pm
ONT
-
BOS
9h 19m2 stops
$247United Airlines
Sat, Jan 24 - Sat, Jan 31
American Airlines Logo
9:45 am - 6:45 pm
BOS
-
ONT
12h 00m1 stop
American Airlines Logo
4:45 pm - 5:32 am
ONT
-
BOS
9h 47m1 stop
$248American Airlines
Thu, Jan 29 - Sun, Feb 1
United Airlines Logo
12:08 pm - 8:58 pm
BOS
-
ONT
11h 50m2 stops
United Airlines Logo
6:00 am - 5:13 pm
ONT
-
BOS
8h 13m1 stop
$253United Airlines
Mon, Jan 26 - Mon, Feb 2
Alaska Airlines Logo
7:00 am - 3:08 pm
BOS
-
ONT
11h 08m1 stop
Alaska Airlines Logo
11:53 am - 11:54 pm
ONT
-
BOS
9h 01m1 stop
$258Alaska Airlines
Wed, Jan 28 - Thu, Feb 5
American Airlines Logo
6:45 am - 1:54 pm
BOS
-
ONT
10h 09m1 stop
American Airlines Logo
7:50 pm - 5:34 am
ONT
-
BOS
6h 44m1 stop
$259American Airlines
Wed, Feb 25 - Sun, Mar 1
American Airlines Logo
11:21 am - 6:20 pm
BOS
-
ONT
9h 59m2 stops
American Airlines Logo
12:57 pm - 11:12 pm
ONT
-
BOS
7h 15m1 stop
$264American Airlines
Mon, Feb 2 - Sat, Feb 7
Delta Logo
7:15 am - 1:56 pm
BOS
-
ONT
9h 41m1 stop
Delta Logo
10:20 pm - 10:02 am
ONT
-
BOS
8h 42m1 stop
$267Delta
Sat, Jan 31 - Mon, Feb 16
United Airlines Logo
6:00 am - 12:17 pm
BOS
-
ONT
9h 17m1 stop
United Airlines Logo
1:24 pm - 11:46 pm
ONT
-
BOS
7h 22m1 stop
$269United Airlines
Sat, Jan 17 - Tue, Jan 20

JetBlue flights from Boston to Ontario

Our best JetBlue deals on Boston to Ontario flight tickets
JetBlue
May 1
BOS2:55 pmBoston Logan Intl
10h 14m
1 stop
ONT10:09 pmOntario
May 4
ONT11:25 pmOntario
8h 13m
1 stop
BOS10:38 amBoston Logan Intl
$293
Find similar
JetBlue
Apr 30
BOS2:55 pmBoston Logan Intl
10h 14m
1 stop
ONT10:09 pmOntario
May 3
ONT11:25 pmOntario
8h 13m
1 stop
BOS10:38 amBoston Logan Intl
$324
Find similar
JetBlue
May 15
BOS2:55 pmBoston Logan Intl
10h 14m
1 stop
ONT10:09 pmOntario
May 18
ONT11:25 pmOntario
8h 13m
1 stop
BOS10:38 amBoston Logan Intl
$327
Find similar

American Airlines flights from Boston to Ontario

Our best American Airlines deals on Boston to Ontario flight tickets
American Airlines
Feb 25
BOS6:45 amBoston Logan Intl
10h 09m
1 stop
ONT1:54 pmOntario
Mar 1
ONT7:50 pmOntario
6h 44m
1 stop
BOS5:34 amBoston Logan Intl
$259
Find similar
American Airlines
Feb 2
BOS11:21 amBoston Logan Intl
9h 59m
2 stops
ONT6:20 pmOntario
Feb 7
ONT12:57 pmOntario
7h 15m
1 stop
BOS11:12 pmBoston Logan Intl
$264
Find similar
American Airlines
Jan 15
BOS4:52 pmBoston Logan Intl
8h 21m
1 stop
ONT10:13 pmOntario
Jan 21
ONT12:57 pmOntario
7h 15m
1 stop
BOS11:12 pmBoston Logan Intl
$303
Find similar

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 December 28, 2025.
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

Sat 1/24

7:15 am-1:56 pm

1 stop9h 41m

Ontario

Sat 1/31

3:30 pm-6:50 am

1 stop12h 20m

$237

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sat 1/24

6:00 am-12:47 pm

2 stops9h 47m

Ontario

Sat 1/31

1:24 pm-11:52 pm

1 stop7h 28m

$242

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sat 1/24

6:00 am-12:47 pm

2 stops9h 47m

Ontario

Sat 1/31

5:05 am-5:24 pm

2 stops9h 19m

$247

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 1/29

9:45 am-6:45 pm

1 stop12h 00m

Ontario

Sun 2/1

4:45 pm-5:32 am

1 stop9h 47m

$248

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Mon 1/26

12:08 pm-8:58 pm

2 stops11h 50m

Ontario

Mon 2/2

6:00 am-5:13 pm

1 stop8h 13m

$253

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 1/28

7:00 am-3:08 pm

1 stop11h 08m

Ontario

Thu 2/5

11:53 am-11:54 pm

1 stop9h 01m

$258

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 2/25

6:45 am-1:54 pm

1 stop10h 09m

Ontario

Sun 3/1

7:50 pm-5:34 am

1 stop6h 44m

$259

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Mon 2/2

11:21 am-6:20 pm

2 stops9h 59m

Ontario

Sat 2/7

12:57 pm-11:12 pm

1 stop7h 15m

$264

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sat 1/31

7:15 am-1:56 pm

1 stop9h 41m

Ontario

Mon 2/16

10:20 pm-10:02 am

1 stop8h 42m

$267

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sat 1/17

6:00 am-12:17 pm

1 stop9h 17m

Ontario

Tue 1/20

1:24 pm-11:46 pm

1 stop7h 22m

$269

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, January 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 $318. If you aren’t able to travel during the month of January, then book flights to Ontario from Boston during May instead. Flights to Ontario in May, while not as cheap as those in January, still average around $358.

What is the cheapest time of day to depart on your flight to Ontario?

At noon is the cheapest time of day to fly from Boston to Ontario when you can find flight prices for as low as $428. Flying to Ontario at noon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are $552 on average. Flights to Ontario from Boston in the evening are generally more expensive because this time of day is more convenient for travelers’ schedules.

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 $407 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 December 2025, prices for Boston to Ontario flights are approximately 20% 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

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

  • 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 $188Free CancellationRating
7.9
8,018 reviews
Search Delta flights
United AirlinesPriceFrom $268Free CancellationRating
7.4
9,113 reviews
Search United Airlines flights
JetBluePriceFrom $270Free CancellationRating
7.2
2,901 reviews
Search JetBlue flights
American AirlinesPriceFrom $279Free CancellationRating
7.2
11,072 reviews
Search American Airlines flights
SouthwestPriceFrom $328Free CancellationRating
8.0
4,256 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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