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Cheap flights from Boston to Los Angeles from $155

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 8/26. 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.
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
Thu, Aug 27 - Sat, Sep 5
Delta Logo
5:30 am - 10:42 am
BOS
-
ONT
8h 12m
1 stop
Delta Logo
1:06 pm - 11:57 pm
ONT
-
BOS
7h 51m
1 stop
$337Delta
Thu, Aug 27 - Tue, Sep 1
Delta Logo
5:30 am - 10:42 am
BOS
-
ONT
8h 12m
1 stop
Delta Logo
7:05 am - 7:35 pm
ONT
-
BOS
9h 30m
1 stop
$338Delta
Thu, Aug 27 - Sat, Sep 5
Delta Logo
6:05 am - 12:16 pm
BOS
-
ONT
9h 11m
1 stop
Delta Logo
7:05 am - 7:35 pm
ONT
-
BOS
9h 30m
1 stop
$342Delta
Sun, Aug 30 - Sat, Sep 5
Alaska Airlines Logo
5:42 pm - 9:51 am
BOS
-
ONT
19h 09m
1 stop
Alaska Airlines Logo
7:12 am - 6:09 am
ONT
-
BOS
19h 57m
1 stop
$346Alaska Airlines
Thu, Aug 27 - Sat, Sep 5
Delta Logo
3:14 pm - 9:52 pm
BOS
-
ONT
9h 38m
1 stop
Delta Logo
7:05 am - 7:35 pm
ONT
-
BOS
9h 30m
1 stop
$347Delta
Thu, Aug 27 - Sat, Sep 5
Delta Logo
1:55 pm - 9:52 pm
BOS
-
ONT
10h 57m
1 stop
Delta Logo
7:05 am - 7:35 pm
ONT
-
BOS
9h 30m
1 stop
$348Delta
Thu, Aug 27 - Sat, Sep 5
United Airlines Logo
7:45 am - 12:50 pm
BOS
-
ONT
8h 05m
1 stop
United Airlines Logo
7:13 pm - 8:14 am
ONT
-
BOS
10h 01m
1 stop
$350United Airlines
Wed, Sep 9 - Sun, Sep 13
Southwest Logo
5:25 am - 12:40 pm
BOS
-
ONT
10h 15m
2 stops
Southwest Logo
11:55 pm - 12:15 pm
ONT
-
BOS
9h 20m
1 stop
$352Southwest
Tue, Aug 18 - Tue, Aug 25
Delta Logo
12:20 pm - 6:30 pm
BOS
-
ONT
9h 10m
1 stop
Delta Logo
10:00 pm - 9:39 am
ONT
-
BOS
8h 39m
1 stop
$357Delta
Fri, Aug 21 - Sun, Aug 30

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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 27
BOS6:45 amBoston Logan Intl
7h 58m
1 stop
ONT11:43 amOntario
Sep 5
ONT12:59 pmOntario
7h 25m
1 stop
BOS11:24 pmBoston Logan Intl
$336
American Airlines
Aug 14
BOS5:51 amBoston Logan Intl
8h 52m
1 stop
ONT11:43 amOntario
Aug 21
ONT12:33 pmOntario
8h 04m
1 stop
BOS11:37 pmBoston Logan Intl
$367
American Airlines
Aug 18
BOS5:51 amBoston Logan Intl
10h 40m
1 stop
ONT1:31 pmOntario
Aug 22
ONT10:29 amOntario
10h 08m
1 stop
BOS11:37 pmBoston Logan Intl
$370

Alaska Airlines flights from Boston to Ontario

Our best Alaska Airlines deals on Boston to Ontario flight tickets
Alaska Airlines
Aug 27
BOS5:42 pmBoston Logan Intl
19h 09m
1 stop
ONT9:51 amOntario
Sep 5
ONT7:12 amOntario
19h 57m
1 stop
BOS6:09 amBoston Logan Intl
$346
Alaska Airlines
Sep 19
BOS7:12 amBoston Logan Intl
10h 04m
1 stop
ONT2:16 pmOntario
Sep 20
ONT6:14 pmOntario
8h 55m
1 stop
BOS6:09 amBoston Logan Intl
$375
Alaska Airlines
Sep 4
BOS3:31 pmBoston Logan Intl
10h 53m
1 stop
ONT11:24 pmOntario
Sep 11
ONT6:14 pmOntario
8h 55m
1 stop
BOS6:09 amBoston Logan Intl
$376

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 27, 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
Quickest round-trip

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 8/27

6:45 am-11:43 am

1 stop7h 58m

Ontario

Sat 9/5

12:59 pm-11:24 pm

1 stop7h 25m

$336

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 8/27

5:30 am-10:42 am

1 stop8h 12m

Ontario

Tue 9/1

1:06 pm-11:57 pm

1 stop7h 51m

$337

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 8/27

5:30 am-10:42 am

1 stop8h 12m

Ontario

Sat 9/5

7:05 am-7:35 pm

1 stop9h 30m

$338

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sun 8/30

6:05 am-12:16 pm

1 stop9h 11m

Ontario

Sat 9/5

7:05 am-7:35 pm

1 stop9h 30m

$342

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 8/27

5:42 pm-9:51 am

1 stop19h 09m

Ontario

Sat 9/5

7:12 am-6:09 am

1 stop19h 57m

$346

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 8/27

3:14 pm-9:52 pm

1 stop9h 38m

Ontario

Sat 9/5

7:05 am-7:35 pm

1 stop9h 30m

$347

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 8/27

1:55 pm-9:52 pm

1 stop10h 57m

Ontario

Sat 9/5

7:05 am-7:35 pm

1 stop9h 30m

$348

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 9/9

7:45 am-12:50 pm

1 stop8h 05m

Ontario

Sun 9/13

7:13 pm-8:14 am

1 stop10h 01m

$350

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 8/18

5:25 am-12:40 pm

2 stops10h 15m

Ontario

Tue 8/25

11:55 pm-12:15 pm

1 stop9h 20m

$352

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Fri 8/21

12:20 pm-6:30 pm

1 stop9h 10m

Ontario

Sun 8/30

10:00 pm-9:39 am

1 stop8h 39m

$357

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 $336.

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 July 2026, prices for Boston to Ontario flights are approximately 19% 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 40m

Direct flights

None
The fastest flight from Boston to Ontario takes 7h 40m
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 40m.

  • 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
8,489 reviews
Search Delta flights
United AirlinesPriceFrom $239Free CancellationRating
7.4
10,041 reviews
Search United Airlines flights
American AirlinesPriceFrom $258Free CancellationRating
7.1
11,845 reviews
Search American Airlines flights
JetBluePriceFrom $298Free CancellationRating
7.1
3,026 reviews
Search JetBlue flights
SouthwestPriceFrom $307Free CancellationRating
8.0
4,231 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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