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Cheap flights from Boston to Los Angeles from $115

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 9/30. 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.
United Airlines Logo
1:31 pm - 6:44 pm
BOS
-
ONT
8h 13m
1 stop
United Airlines Logo
6:53 pm - 8:23 am
ONT
-
BOS
10h 30m
1 stop
$342United Airlines
Thu, Jan 7 - Mon, Jan 11
United Airlines Logo
2:00 pm - 8:01 pm
BOS
-
ONT
9h 01m
1 stop
United Airlines Logo
7:13 pm - 8:14 am
ONT
-
BOS
10h 01m
1 stop
$342United Airlines
Wed, Sep 16 - Sun, Sep 20
American Airlines Logo
6:00 am - 11:47 am
BOS
-
ONT
8h 47m
1 stop
American Airlines Logo
10:25 am - 9:27 pm
ONT
-
BOS
8h 02m
1 stop
$347American Airlines
Fri, Sep 11 - Sat, Sep 12
American Airlines Logo
6:30 am - 12:03 pm
BOS
-
ONT
8h 33m
1 stop
American Airlines Logo
12:59 pm - 11:24 pm
ONT
-
BOS
7h 25m
1 stop
$347American Airlines
Sun, Aug 30 - Sat, Sep 5
Southwest Logo
9:25 am - 2:25 pm
BOS
-
ONT
8h 00m
1 stop
Southwest Logo
11:55 pm - 12:25 pm
ONT
-
BOS
9h 30m
1 stop
$347Southwest
Tue, Sep 1 - Fri, Sep 11
Southwest Logo
2:10 pm - 6:55 pm
BOS
-
ONT
7h 45m
1 stop
Southwest Logo
10:55 am - 12:05 am
ONT
-
BOS
10h 10m
1 stop
$347Southwest
Tue, Aug 25 - Tue, Sep 1
Delta Logo
6:05 am - 12:21 pm
BOS
-
ONT
9h 16m
1 stop
Delta Logo
11:10 pm - 9:50 am
ONT
-
BOS
7h 40m
1 stop
$347Delta
Sun, Nov 8 - Fri, Dec 4
Delta Logo
5:30 am - 11:06 am
BOS
-
ONT
8h 36m
1 stop
Delta Logo
11:10 pm - 9:50 am
ONT
-
BOS
7h 40m
1 stop
$347Delta
Sat, Nov 7 - Sun, Dec 6
Alaska Airlines Logo
5:42 pm - 9:51 am
BOS
-
ONT
19h 09m
1 stop
Alaska Airlines Logo
10:47 am - 6:09 am
ONT
-
BOS
16h 22m
1 stop
$347Alaska Airlines
Thu, Sep 10 - Sat, Sep 12
Alaska Airlines Logo
9:33 am - 5:18 pm
BOS
-
ONT
10h 45m
1 stop
Alaska Airlines Logo
6:14 pm - 6:09 am
ONT
-
BOS
8h 55m
1 stop
$347Alaska Airlines
Thu, Sep 17 - Mon, Sep 21

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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 28
BOS6:45 amBoston Logan Intl
7h 58m
1 stop
ONT11:43 amOntario
Sep 6
ONT8:01 pmOntario
6h 46m
1 stop
BOS5:47 amBoston Logan Intl
$348
American Airlines
Aug 28
BOS6:45 amBoston Logan Intl
7h 58m
1 stop
ONT11:43 amOntario
Sep 6
ONT8:01 pmOntario
6h 46m
1 stop
BOS5:47 amBoston Logan Intl
$349
American Airlines
Aug 28
BOS6:45 amBoston Logan Intl
7h 58m
1 stop
ONT11:43 amOntario
Sep 6
ONT8:01 pmOntario
6h 46m
1 stop
BOS5:47 amBoston Logan Intl
$356

United Airlines flights from Boston to Ontario

Our best United Airlines deals on Boston to Ontario flight tickets
United Airlines
Sep 16
BOS2:00 pmBoston Logan Intl
9h 01m
1 stop
ONT8:01 pmOntario
Sep 20
ONT7:13 pmOntario
10h 01m
1 stop
BOS8:14 amBoston Logan Intl
$342
United Airlines
Aug 30
BOS6:00 amBoston Logan Intl
9h 12m
1 stop
ONT12:12 pmOntario
Sep 5
ONT11:00 amOntario
9h 59m
2 stops
BOS11:59 pmBoston Logan Intl
$362
United Airlines
Sep 9
BOS5:01 pmBoston Logan Intl
8h 58m
1 stop
ONT10:59 pmOntario
Sep 30
ONT8:03 amOntario
9h 59m
1 stop
BOS9:02 pmBoston Logan Intl
$368

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 August 1, 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

Thu 1/7

1:31 pm-6:44 pm

1 stop8h 13m

Ontario

Mon 1/11

6:53 pm-8:23 am

1 stop10h 30m

$342

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 9/16

2:00 pm-8:01 pm

1 stop9h 01m

Ontario

Sun 9/20

7:13 pm-8:14 am

1 stop10h 01m

$342

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Fri 9/11

6:00 am-11:47 am

1 stop8h 47m

Ontario

Sat 9/12

10:25 am-9:27 pm

1 stop8h 02m

$347
Quickest round-trip

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sun 8/30

6:30 am-12:03 pm

1 stop8h 33m

Ontario

Sat 9/5

12:59 pm-11:24 pm

1 stop7h 25m

$347

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 9/1

9:25 am-2:25 pm

1 stop8h 00m

Ontario

Fri 9/11

11:55 pm-12:25 pm

1 stop9h 30m

$347

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 8/25

2:10 pm-6:55 pm

1 stop7h 45m

Ontario

Tue 9/1

10:55 am-12:05 am

1 stop10h 10m

$347

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sun 11/8

6:05 am-12:21 pm

1 stop9h 16m

Ontario

Fri 12/4

11:10 pm-9:50 am

1 stop7h 40m

$347

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sat 11/7

5:30 am-11:06 am

1 stop8h 36m

Ontario

Sun 12/6

11:10 pm-9:50 am

1 stop7h 40m

$347

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 9/10

5:42 pm-9:51 am

1 stop19h 09m

Ontario

Sat 9/12

10:47 am-6:09 am

1 stop16h 22m

$347

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 9/17

9:33 am-5:18 pm

1 stop10h 45m

Ontario

Mon 9/21

6:14 pm-6:09 am

1 stop8h 55m

$347

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?

Prices are currently low for flights on this route.

Typical prices usually range from $358 to $756.
The lowest price recently found on this route was $342.

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 $491 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 $326 on momondo.

How have Boston to Ontario flight prices changed over time?

As of August 2026, prices for Boston to Ontario flights are approximately 17% 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 00m

Direct flights

None
The fastest flight from Boston to Ontario takes 8h 00m
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 00m.

  • 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
8,497 reviews
Search Delta flights
United AirlinesPriceFrom $239Free CancellationRating
7.4
10,062 reviews
Search United Airlines flights
American AirlinesPriceFrom $258Free CancellationRating
7.1
11,845 reviews
Search American Airlines flights
JetBluePriceFrom $298Free CancellationRating
7.1
3,030 reviews
Search JetBlue flights
SouthwestPriceFrom $307Free CancellationRating
8.0
4,229 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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