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Cheap flights from Boston to Los Angeles from $91

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 3/18. 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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American Airlines Logo
11:51 am - 8:27 pm
BOS
-
ONT
11h 36m1 stop
American Airlines Logo
11:59 pm - 11:54 am
ONT
-
BOS
8h 55m1 stop
$181American Airlines
Tue, Apr 14 - Tue, Apr 21
American Airlines Logo
8:50 am - 4:05 pm
BOS
-
ONT
10h 15m1 stop
American Airlines Logo
6:22 am - 7:33 pm
ONT
-
BOS
10h 11m2 stops
$186American Airlines
Tue, Feb 3 - Tue, Feb 10
American Airlines Logo
11:10 am - 6:20 pm
BOS
-
ONT
10h 10m2 stops
American Airlines Logo
6:00 am - 7:02 pm
ONT
-
BOS
10h 02m2 stops
$192American Airlines
Tue, Feb 3 - Tue, Feb 10
Southwest Logo
4:50 pm - 9:45 pm
BOS
-
ONT
7h 55m1 stop
Southwest Logo
6:30 am - 4:50 pm
ONT
-
BOS
7h 20m1 stop
$197Southwest
Wed, Feb 4 - Wed, Feb 11
American Airlines Logo
8:50 am - 4:05 pm
BOS
-
ONT
10h 15m1 stop
American Airlines Logo
9:59 am - 8:32 pm
ONT
-
BOS
7h 33m1 stop
$199American Airlines
Mon, Feb 2 - Wed, Feb 4
Southwest Logo
2:25 pm - 9:30 pm
BOS
-
ONT
10h 05m2 stops
Southwest Logo
11:55 pm - 11:00 am
ONT
-
BOS
8h 05m1 stop
$202Southwest
Tue, Apr 14 - Tue, Apr 21
American Airlines Logo
8:50 am - 4:05 pm
BOS
-
ONT
10h 15m1 stop
American Airlines Logo
9:59 am - 11:43 pm
ONT
-
BOS
10h 44m2 stops
$204American Airlines
Mon, Feb 2 - Wed, Feb 4
Southwest Logo
6:50 am - 2:45 pm
BOS
-
ONT
10h 55m1 stop
Southwest Logo
6:50 am - 5:10 pm
ONT
-
BOS
7h 20m1 stop
$207Southwest
Thu, Jan 29 - Wed, Feb 4
Southwest Logo
6:50 am - 2:45 pm
BOS
-
ONT
10h 55m1 stop
Southwest Logo
5:45 pm - 8:20 am
ONT
-
BOS
11h 35m2 stops
$212Southwest
Thu, Jan 29 - Wed, Feb 4
Southwest Logo
5:30 am - 4:05 pm
BOS
-
ONT
13h 35m2 stops
Southwest Logo
5:45 pm - 8:20 am
ONT
-
BOS
11h 35m2 stops
$217Southwest
Thu, Jan 29 - Wed, Feb 4

Southwest flights from Boston to Ontario

Our best Southwest deals on Boston to Ontario flight tickets
Southwest
Feb 4
BOS4:50 pmBoston Logan Intl
7h 55m
1 stop
ONT9:45 pmOntario
Feb 11
ONT6:30 amOntario
7h 20m
1 stop
BOS4:50 pmBoston Logan Intl
$197
Southwest
Apr 14
BOS2:25 pmBoston Logan Intl
10h 05m
2 stops
ONT9:30 pmOntario
Apr 21
ONT11:55 pmOntario
8h 05m
1 stop
BOS11:00 amBoston Logan Intl
$202
Southwest
Jan 29
BOS6:50 amBoston Logan Intl
10h 55m
1 stop
ONT2:45 pmOntario
Feb 4
ONT6:50 amOntario
7h 20m
1 stop
BOS5:10 pmBoston Logan Intl
$207

Alaska Airlines flights from Boston to Ontario

Our best Alaska Airlines deals on Boston to Ontario flight tickets
Alaska Airlines
Jan 27
BOS7:00 amBoston Logan Intl
11h 08m
1 stop
ONT3:08 pmOntario
Jan 29
ONT11:53 amOntario
9h 01m
1 stop
BOS11:54 pmBoston Logan Intl
$245
Alaska Airlines
Jan 27
BOS7:00 amBoston Logan Intl
11h 08m
1 stop
ONT3:08 pmOntario
Jan 31
ONT11:53 amOntario
9h 01m
1 stop
BOS11:54 pmBoston Logan Intl
$255
Alaska Airlines
Jan 28
BOS7:00 amBoston Logan Intl
11h 08m
1 stop
ONT3:08 pmOntario
Feb 4
ONT11:53 amOntario
9h 01m
1 stop
BOS11:54 pmBoston Logan Intl
$257

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 January 8, 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

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 4/14

11:51 am-8:27 pm

1 stop11h 36m

Ontario

Tue 4/21

11:59 pm-11:54 am

1 stop8h 55m

$181

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 2/3

8:50 am-4:05 pm

1 stop10h 15m

Ontario

Tue 2/10

6:22 am-7:33 pm

2 stops10h 11m

$186

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 2/3

11:10 am-6:20 pm

2 stops10h 10m

Ontario

Tue 2/10

6:00 am-7:02 pm

2 stops10h 02m

$192

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 2/4

4:50 pm-9:45 pm

1 stop7h 55m

Ontario

Wed 2/11

6:30 am-4:50 pm

1 stop7h 20m

$197

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Mon 2/2

8:50 am-4:05 pm

1 stop10h 15m

Ontario

Wed 2/4

9:59 am-8:32 pm

1 stop7h 33m

$199

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 4/14

2:25 pm-9:30 pm

2 stops10h 05m

Ontario

Tue 4/21

11:55 pm-11:00 am

1 stop8h 05m

$202

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Mon 2/2

8:50 am-4:05 pm

1 stop10h 15m

Ontario

Wed 2/4

9:59 am-11:43 pm

2 stops10h 44m

$204

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 1/29

6:50 am-2:45 pm

1 stop10h 55m

Ontario

Wed 2/4

6:50 am-5:10 pm

1 stop7h 20m

$207

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 1/29

6:50 am-2:45 pm

1 stop10h 55m

Ontario

Wed 2/4

5:45 pm-8:20 am

2 stops11h 35m

$212

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 1/29

5:30 am-4:05 pm

2 stops13h 35m

Ontario

Wed 2/4

5:45 pm-8:20 am

2 stops11h 35m

$217

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Los Angeles from

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, May 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 $358. If you aren’t able to travel during the month of May, then book flights to Ontario from Boston during July instead. Flights to Ontario in July, while not as cheap as those in May, still average around $358.

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 $413 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 $296 on momondo.

How have Boston to Ontario flight prices changed over time?

As of January 2026, prices for Boston to Ontario flights are approximately 15% 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

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

  • 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 $188Free CancellationRating
7.9
8,032 reviews
Search Delta flights
United AirlinesPriceFrom $268Free CancellationRating
7.4
9,142 reviews
Search United Airlines flights
JetBluePriceFrom $270Free CancellationRating
7.2
2,892 reviews
Search JetBlue flights
American AirlinesPriceFrom $279Free CancellationRating
7.2
11,097 reviews
Search American Airlines flights
SouthwestPriceFrom $328Free CancellationRating
8.0
4,250 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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