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Cheap flights from Boston to Los Angeles from $167

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 9/5. 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
6:00 am - 12:12 pm
BOS
-
ONT
9h 12m
1 stop
United Airlines Logo
7:13 pm - 8:14 am
ONT
-
BOS
10h 01m
1 stop
$332United Airlines
Fri, Sep 11 - Sun, Sep 13
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
$336American Airlines
Sun, Aug 23 - Tue, Sep 1
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
$337American Airlines
Sun, Aug 23 - Tue, Sep 1
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
$338American Airlines
Thu, Aug 20 - Fri, Aug 28
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
$339American Airlines
Thu, Aug 20 - Thu, Aug 27
Southwest Logo
1:30 pm - 7:20 pm
BOS
-
ONT
8h 50m
1 stop
Southwest Logo
8:40 pm - 9:55 am
ONT
-
BOS
10h 15m
2 stops
$342Southwest
Thu, Aug 20 - Mon, Aug 24
Southwest Logo
5:50 am - 2:00 pm
BOS
-
ONT
11h 10m
2 stops
Southwest Logo
5:15 am - 4:55 pm
ONT
-
BOS
8h 40m
2 stops
$347Southwest
Fri, Aug 28 - Mon, Aug 31
Delta Logo
3:14 pm - 9:52 pm
BOS
-
ONT
9h 38m
1 stop
Delta Logo
12:00 pm - 12:38 am
ONT
-
BOS
9h 38m
1 stop
$348Delta
Thu, Aug 27 - Sat, Sep 5
Southwest Logo
5:00 am - 12:00 pm
BOS
-
ONT
10h 00m
2 stops
Southwest Logo
10:55 am - 12:05 am
ONT
-
BOS
10h 10m
1 stop
$353Southwest
Mon, Aug 17 - Wed, Aug 26
American Airlines Logo
6:30 am - 12:03 pm
BOS
-
ONT
8h 33m
1 stop
American Airlines Logo
8:01 pm - 5:47 am
ONT
-
BOS
6h 46m
1 stop
$356American Airlines
Sun, Aug 16 - Sun, Aug 23

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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 23
BOS6:45 amBoston Logan Intl
7h 58m
1 stop
ONT11:43 amOntario
Sep 1
ONT12:59 pmOntario
7h 25m
1 stop
BOS11:24 pmBoston Logan Intl
$336
American Airlines
Aug 23
BOS6:45 amBoston Logan Intl
7h 58m
1 stop
ONT11:43 amOntario
Sep 1
ONT12:59 pmOntario
7h 25m
1 stop
BOS11:24 pmBoston Logan Intl
$337
American Airlines
Aug 20
BOS6:45 amBoston Logan Intl
7h 58m
1 stop
ONT11:43 amOntario
Aug 28
ONT12:59 pmOntario
7h 25m
1 stop
BOS11:24 pmBoston Logan Intl
$338

Southwest flights from Boston to Ontario

Our best Southwest deals on Boston to Ontario flight tickets
Southwest
Aug 20
BOS1:30 pmBoston Logan Intl
8h 50m
1 stop
ONT7:20 pmOntario
Aug 24
ONT8:40 pmOntario
10h 15m
2 stops
BOS9:55 amBoston Logan Intl
$342
Southwest
Aug 28
BOS5:50 amBoston Logan Intl
11h 10m
2 stops
ONT2:00 pmOntario
Aug 31
ONT5:15 amOntario
8h 40m
2 stops
BOS4:55 pmBoston Logan Intl
$347
Southwest
Aug 17
BOS5:00 amBoston Logan Intl
10h 00m
2 stops
ONT12:00 pmOntario
Aug 26
ONT10:55 amOntario
10h 10m
1 stop
BOS12:05 amBoston Logan Intl
$353

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 July 17, 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 9/11

6:00 am-12:12 pm

1 stop9h 12m

Ontario

Sun 9/13

7:13 pm-8:14 am

1 stop10h 01m

$332

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sun 8/23

6:45 am-11:43 am

1 stop7h 58m

Ontario

Tue 9/1

12:59 pm-11:24 pm

1 stop7h 25m

$336

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sun 8/23

6:45 am-11:43 am

1 stop7h 58m

Ontario

Tue 9/1

12:59 pm-11:24 pm

1 stop7h 25m

$337

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

$338

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 8/20

6:45 am-11:43 am

1 stop7h 58m

Ontario

Thu 8/27

12:59 pm-11:24 pm

1 stop7h 25m

$339

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 8/20

1:30 pm-7:20 pm

1 stop8h 50m

Ontario

Mon 8/24

8:40 pm-9:55 am

2 stops10h 15m

$342

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Fri 8/28

5:50 am-2:00 pm

2 stops11h 10m

Ontario

Mon 8/31

5:15 am-4:55 pm

2 stops8h 40m

$347

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 8/27

3:14 pm-9:52 pm

1 stop9h 38m

Ontario

Sat 9/5

12:00 pm-12:38 am

1 stop9h 38m

$348

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Mon 8/17

5:00 am-12:00 pm

2 stops10h 00m

Ontario

Wed 8/26

10:55 am-12:05 am

1 stop10h 10m

$353
Quickest round-trip

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sun 8/16

6:30 am-12:03 pm

1 stop8h 33m

Ontario

Sun 8/23

8:01 pm-5:47 am

1 stop6h 46m

$356

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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2

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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 $480 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 July 2026, prices for Boston to Ontario flights are approximately 25% 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 57m

Direct flights

None
The fastest flight from Boston to Ontario takes 7h 57m
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 57m.

  • 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
8,472 reviews
Search Delta flights
United AirlinesPriceFrom $239Free CancellationRating
7.4
9,993 reviews
Search United Airlines flights
American AirlinesPriceFrom $258Free CancellationRating
7.1
11,816 reviews
Search American Airlines flights
JetBluePriceFrom $298Free CancellationRating
7.1
3,009 reviews
Search JetBlue flights
SouthwestPriceFrom $305Free CancellationRating
8.0
4,242 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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