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Cheap flights from Boston to Los Angeles from $103

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 4/14. 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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Find the cheapest flights from Boston to Los Angeles

Cheap round-trip flights

Enter your travel dates to find the best prices.
Southwest Logo
7:20 am - 1:15 pm
BOS
-
ONT
8h 55m
1 stop
Southwest Logo
9:55 pm - 8:05 am
ONT
-
BOS
7h 10m
1 stop
$276Southwest
Wed, May 20 - Wed, May 27
Southwest Logo
6:20 am - 1:30 pm
BOS
-
ONT
10h 10m
2 stops
Southwest Logo
9:55 pm - 9:45 am
ONT
-
BOS
8h 50m
1 stop
$282Southwest
Wed, Apr 15 - Mon, Apr 20
Southwest Logo
5:35 am - 10:15 am
BOS
-
ONT
7h 40m
1 stop
Southwest Logo
9:55 pm - 8:15 am
ONT
-
BOS
7h 20m
1 stop
$291Southwest
Tue, Apr 7 - Mon, May 4
Southwest Logo
5:35 am - 10:15 am
BOS
-
ONT
7h 40m
1 stop
Southwest Logo
11:55 pm - 12:15 pm
ONT
-
BOS
9h 20m
2 stops
$296Southwest
Tue, Apr 7 - Mon, May 4
Alaska Airlines Logo
7:00 am - 2:32 pm
BOS
-
ONT
10h 32m
1 stop
Alaska Airlines Logo
10:39 am - 11:59 pm
ONT
-
BOS
10h 20m
1 stop
$309Alaska Airlines
Wed, Apr 29 - Mon, May 11
Southwest Logo
2:25 pm - 9:50 pm
BOS
-
ONT
10h 25m
2 stops
Southwest Logo
9:55 pm - 9:55 am
ONT
-
BOS
9h 00m
1 stop
$314Southwest
Tue, Apr 14 - Sat, Apr 18
United Airlines Logo
4:28 pm - 10:31 pm
BOS
-
ONT
9h 03m
1 stop
United Airlines Logo
6:49 pm - 8:24 am
ONT
-
BOS
10h 35m
1 stop
$318United Airlines
Tue, Apr 7 - Sat, Apr 11
Delta Logo
10:30 am - 6:01 pm
BOS
-
ONT
10h 31m
1 stop
Delta Logo
7:00 am - 5:57 pm
ONT
-
BOS
7h 57m
1 stop
$319Delta
Thu, Aug 20 - Wed, Sep 2
Delta Logo
3:00 pm - 9:00 pm
BOS
-
ONT
9h 00m
1 stop
Delta Logo
10:00 pm - 9:46 am
ONT
-
BOS
8h 46m
1 stop
$320Delta
Fri, May 1 - Fri, May 8
Delta Logo
6:15 am - 12:23 pm
BOS
-
ONT
9h 08m
1 stop
Delta Logo
1:29 pm - 11:57 pm
ONT
-
BOS
7h 28m
1 stop
$321Delta
Wed, Apr 8 - Wed, Apr 15

Southwest flights from Boston to Ontario

Our best Southwest deals on Boston to Ontario flight tickets
Southwest
May 2
BOS2:20 pmBoston Logan Intl
10h 40m
1 stop
ONT10:00 pmOntario
May 9
ONT9:55 pmOntario
7h 35m
1 stop
BOS8:30 amBoston Logan Intl
$251
Southwest
May 2
BOS9:10 amBoston Logan Intl
11h 25m
2 stops
ONT5:35 pmOntario
May 10
ONT9:55 pmOntario
7h 10m
1 stop
BOS8:05 amBoston Logan Intl
$256
Southwest
May 2
BOS1:50 pmBoston Logan Intl
10h 30m
2 stops
ONT9:20 pmOntario
May 10
ONT7:40 pmOntario
9h 25m
2 stops
BOS8:05 amBoston Logan Intl
$261

Alaska Airlines flights from Boston to Ontario

Our best Alaska Airlines deals on Boston to Ontario flight tickets
Alaska Airlines
May 6
BOS7:00 amBoston Logan Intl
10h 30m
1 stop
ONT2:30 pmOntario
May 11
ONT10:39 amOntario
10h 20m
1 stop
BOS11:59 pmBoston Logan Intl
$266
Alaska Airlines
Apr 27
BOS7:00 amBoston Logan Intl
10h 32m
1 stop
ONT2:32 pmOntario
Apr 30
ONT10:39 amOntario
10h 20m
1 stop
BOS11:59 pmBoston Logan Intl
$281
Alaska Airlines
May 2
BOS7:00 amBoston Logan Intl
10h 32m
1 stop
ONT2:32 pmOntario
May 11
ONT10:39 amOntario
10h 20m
1 stop
BOS11:59 pmBoston Logan Intl
$309

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 March 22, 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

Wed 5/20

7:20 am-1:15 pm

1 stop8h 55m

Ontario

Wed 5/27

9:55 pm-8:05 am

1 stop7h 10m

$276

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 4/15

6:20 am-1:30 pm

2 stops10h 10m

Ontario

Mon 4/20

9:55 pm-9:45 am

1 stop8h 50m

$282
Quickest round-trip

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 4/7

5:35 am-10:15 am

1 stop7h 40m

Ontario

Mon 5/4

9:55 pm-8:15 am

1 stop7h 20m

$291

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 4/7

5:35 am-10:15 am

1 stop7h 40m

Ontario

Mon 5/4

11:55 pm-12:15 pm

2 stops9h 20m

$296

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 4/29

7:00 am-2:32 pm

1 stop10h 32m

Ontario

Mon 5/11

10:39 am-11:59 pm

1 stop10h 20m

$309

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 4/14

2:25 pm-9:50 pm

2 stops10h 25m

Ontario

Sat 4/18

9:55 pm-9:55 am

1 stop9h 00m

$314

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 4/7

4:28 pm-10:31 pm

1 stop9h 03m

Ontario

Sat 4/11

6:49 pm-8:24 am

1 stop10h 35m

$318

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 8/20

10:30 am-6:01 pm

1 stop10h 31m

Ontario

Wed 9/2

7:00 am-5:57 pm

1 stop7h 57m

$319

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Fri 5/1

3:00 pm-9:00 pm

1 stop9h 00m

Ontario

Fri 5/8

10:00 pm-9:46 am

1 stop8h 46m

$320

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 4/8

6:15 am-12:23 pm

1 stop9h 08m

Ontario

Wed 4/15

1:29 pm-11:57 pm

1 stop7h 28m

$321

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 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 May instead. Flights to Ontario in May, while not as cheap as those in February, still average around $344.

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 $399 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 $301 on momondo.

How have Boston to Ontario flight prices changed over time?

As of March 2026, prices for Boston to Ontario flights are approximately 3% 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 49m

Direct flights

None
The fastest flight from Boston to Ontario takes 7h 49m
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 7h 49m.

  • 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 $149Free CancellationRating
7.9
8,319 reviews
Search Delta flights
United AirlinesPriceFrom $239Free CancellationRating
7.4
9,462 reviews
Search United Airlines flights
American AirlinesPriceFrom $259Free CancellationRating
7.1
11,488 reviews
Search American Airlines flights
JetBluePriceFrom $290Free CancellationRating
7.2
2,908 reviews
Search JetBlue flights
SouthwestPriceFrom $297Free CancellationRating
8.0
4,324 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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