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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 8/21. 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
4:55 pm - 10:38 pm
BOS
-
ONT
8h 43m
1 stop
JetBlue Logo
11:50 pm - 11:16 am
ONT
-
BOS
8h 26m
1 stop
$264JetBlue
Fri, Sep 4 - Mon, Sep 7
JetBlue Logo
4:30 pm - 10:38 pm
BOS
-
ONT
9h 08m
1 stop
JetBlue Logo
11:59 pm - 2:43 pm
ONT
-
BOS
11h 44m
1 stop
$265JetBlue
Fri, Aug 21 - Mon, Aug 24
JetBlue Logo
4:30 pm - 10:38 pm
BOS
-
ONT
9h 08m
1 stop
JetBlue Logo
11:59 pm - 2:22 pm
ONT
-
BOS
11h 23m
1 stop
$296JetBlue
Fri, Aug 14 - Tue, Aug 18
Delta Logo
6:05 am - 12:16 pm
BOS
-
ONT
9h 11m
1 stop
Delta Logo
1:06 pm - 11:57 pm
ONT
-
BOS
7h 51m
1 stop
$297Delta
Thu, Aug 13 - Sun, Aug 16
Multiple Airlines Logo
2:40 pm - 10:37 pm
BOS
-
ONT
10h 57m
1 stop
Multiple Airlines Logo
6:05 pm - 6:09 am
ONT
-
BOS
9h 04m
1 stop
$304Multiple Airlines
Tue, Sep 1 - Sat, Sep 5
American Airlines Logo
6:30 am - 12:03 pm
BOS
-
ONT
8h 33m
1 stop
American Airlines Logo
7:05 am - 9:05 pm
ONT
-
BOS
11h 00m
1 stop
$317American Airlines
Fri, Aug 28 - Sun, Aug 30
JetBlue Logo
12:42 pm - 9:59 pm
BOS
-
ONT
12h 17m
1 stop
JetBlue Logo
9:10 pm - 7:57 am
ONT
-
BOS
7h 47m
1 stop
$319JetBlue
Sat, Sep 5 - Fri, Sep 11
Delta Logo
7:53 am - 5:21 pm
BOS
-
ONT
12h 28m
1 stop
Delta Logo
6:01 pm - 7:35 am
ONT
-
BOS
10h 34m
1 stop
$320Delta
Mon, Jul 13 - Mon, Jul 27
JetBlue Logo
4:30 pm - 10:38 pm
BOS
-
ONT
9h 08m
1 stop
JetBlue Logo
11:59 pm - 2:43 pm
ONT
-
BOS
11h 44m
1 stop
$327JetBlue
Fri, Aug 14 - Sun, Aug 23
American Airlines Logo
6:45 am - 11:43 am
BOS
-
ONT
7h 58m
1 stop
American Airlines Logo
12:59 pm - 11:24 pm
ONT
-
BOS
7h 25m
1 stop
$331American Airlines
Thu, Aug 20 - Fri, Aug 28

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JetBlue flights from Boston to Ontario

Our best JetBlue deals on Boston to Ontario flight tickets
JetBlue
Sep 4
BOS4:55 pmBoston Logan Intl
8h 43m
1 stop
ONT10:38 pmOntario
Sep 7
ONT11:50 pmOntario
8h 26m
1 stop
BOS11:16 amBoston Logan Intl
$264
JetBlue
Aug 21
BOS4:30 pmBoston Logan Intl
9h 08m
1 stop
ONT10:38 pmOntario
Aug 24
ONT11:59 pmOntario
11h 44m
1 stop
BOS2:43 pmBoston Logan Intl
$265
JetBlue
Aug 14
BOS4:30 pmBoston Logan Intl
9h 08m
1 stop
ONT10:38 pmOntario
Aug 18
ONT11:59 pmOntario
11h 23m
1 stop
BOS2:22 pmBoston Logan Intl
$296

Delta flights from Boston to Ontario

Our best Delta deals on Boston to Ontario flight tickets
Delta
Aug 13
BOS6:05 amBoston Logan Intl
9h 11m
1 stop
ONT12:16 pmOntario
Aug 16
ONT1:06 pmOntario
7h 51m
1 stop
BOS11:57 pmBoston Logan Intl
$297
Delta
Jul 13
BOS7:53 amBoston Logan Intl
12h 28m
1 stop
ONT5:21 pmOntario
Jul 27
ONT6:01 pmOntario
10h 34m
1 stop
BOS7:35 amBoston Logan Intl
$320
Delta
Nov 26
BOS7:05 amBoston Logan Intl
13h 12m
1 stop
ONT5:17 pmOntario
Dec 2
ONT1:00 pmOntario
7h 49m
1 stop
BOS11:49 pmBoston Logan Intl
$337

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 28, 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 9/4

4:55 pm-10:38 pm

1 stop8h 43m

Ontario

Mon 9/7

11:50 pm-11:16 am

1 stop8h 26m

$264

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Fri 8/21

4:30 pm-10:38 pm

1 stop9h 08m

Ontario

Mon 8/24

11:59 pm-2:43 pm

1 stop11h 44m

$265

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Fri 8/14

4:30 pm-10:38 pm

1 stop9h 08m

Ontario

Tue 8/18

11:59 pm-2:22 pm

1 stop11h 23m

$296

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 8/13

6:05 am-12:16 pm

1 stop9h 11m

Ontario

Sun 8/16

1:06 pm-11:57 pm

1 stop7h 51m

$297

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 9/1

2:40 pm-10:37 pm

1 stop10h 57m

Ontario

Sat 9/5

6:05 pm-6:09 am

1 stop9h 04m

$304

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Fri 8/28

6:30 am-12:03 pm

1 stop8h 33m

Ontario

Sun 8/30

7:05 am-9:05 pm

1 stop11h 00m

$317

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sat 9/5

12:42 pm-9:59 pm

1 stop12h 17m

Ontario

Fri 9/11

9:10 pm-7:57 am

1 stop7h 47m

$319

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Mon 7/13

7:53 am-5:21 pm

1 stop12h 28m

Ontario

Mon 7/27

6:01 pm-7:35 am

1 stop10h 34m

$320

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Fri 8/14

4:30 pm-10:38 pm

1 stop9h 08m

Ontario

Sun 8/23

11:59 pm-2:43 pm

1 stop11h 44m

$327
Quickest round-trip

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 8/20

6:45 am-11:43 am

1 stop7h 58m

Ontario

Fri 8/28

12:59 pm-11:24 pm

1 stop7h 25m

$331

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 $486 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 $304 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 16m

Direct flights

None
The fastest flight from Boston to Ontario takes 8h 16m
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 16m.

  • 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
8,455 reviews
Search Delta flights
United AirlinesPriceFrom $239Free CancellationRating
7.4
9,899 reviews
Search United Airlines flights
American AirlinesPriceFrom $259Free CancellationRating
7.1
11,774 reviews
Search American Airlines flights
SouthwestPriceFrom $305Free CancellationRating
7.9
4,246 reviews
Search Southwest flights
JetBluePriceFrom $319Free CancellationRating
7.1
3,012 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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