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Cheap flights from Boston to Los Angeles from $106

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 4/15. 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.
United Airlines Logo
5:30 am - 12:20 pm
BOS
-
ONT
9h 50m
1 stop
United Airlines Logo
6:49 pm - 8:24 am
ONT
-
BOS
10h 35m
1 stop
$254United Airlines
Wed, Apr 1 - Wed, Apr 8
Alaska Airlines Logo
7:00 am - 3:08 pm
BOS
-
ONT
11h 08m
1 stop
Alaska Airlines Logo
4:02 pm - 6:54 am
ONT
-
BOS
11h 52m
1 stop
$259Alaska Airlines
Wed, Mar 11 - Tue, Mar 17
American Airlines Logo
2:40 pm - 10:07 pm
BOS
-
ONT
10h 27m
2 stops
American Airlines Logo
5:02 pm - 5:34 am
ONT
-
BOS
9h 32m
1 stop
$264American Airlines
Tue, Mar 17 - Tue, Mar 24
JetBlue Logo
2:55 pm - 10:09 pm
BOS
-
ONT
10h 14m
1 stop
JetBlue Logo
11:25 pm - 10:38 am
ONT
-
BOS
8h 13m
1 stop
$269JetBlue
Fri, May 15 - Mon, May 18
Alaska Airlines Logo
7:00 am - 3:08 pm
BOS
-
ONT
11h 08m
1 stop
Alaska Airlines Logo
4:02 pm - 6:54 am
ONT
-
BOS
11h 52m
1 stop
$278Alaska Airlines
Tue, Mar 10 - Tue, Mar 17
United Airlines Logo
1:30 pm - 9:58 pm
BOS
-
ONT
11h 28m
1 stop
United Airlines Logo
6:59 pm - 8:23 am
ONT
-
BOS
10h 24m
1 stop
$280United Airlines
Thu, May 14 - Mon, May 18
Delta Logo
7:10 am - 5:13 pm
BOS
-
ONT
13h 03m
1 stop
Delta Logo
5:53 pm - 6:50 am
ONT
-
BOS
9h 57m
1 stop
$283Delta
Thu, Mar 26 - Tue, Mar 31
United Airlines Logo
1:30 pm - 9:58 pm
BOS
-
ONT
11h 28m
1 stop
United Airlines Logo
7:00 am - 5:22 pm
ONT
-
BOS
7h 22m
1 stop
$285United Airlines
Thu, May 14 - Tue, May 19
Alaska Airlines Logo
4:33 pm - 11:59 pm
BOS
-
ONT
10h 26m
1 stop
Alaska Airlines Logo
7:59 pm - 11:59 pm
ONT
-
BOS
25h 00m
1 stop
$292Alaska Airlines
Mon, May 4 - Thu, May 7
Alaska Airlines Logo
7:00 am - 3:08 pm
BOS
-
ONT
11h 08m
1 stop
Alaska Airlines Logo
10:33 am - 11:59 pm
ONT
-
BOS
10h 26m
1 stop
$295Alaska Airlines
Tue, Mar 17 - Tue, Apr 7

Southwest flights from Boston to Ontario

Our best Southwest deals on Boston to Ontario flight tickets
Southwest
Apr 3
BOS5:00 amBoston Logan Intl
7h 55m
1 stop
ONT9:55 amOntario
Apr 7
ONT1:55 pmOntario
7h 10m
1 stop
BOS12:05 amBoston Logan Intl
$299
Southwest
May 13
BOS2:25 pmBoston Logan Intl
10h 05m
2 stops
ONT9:30 pmOntario
May 20
ONT1:55 pmOntario
7h 10m
1 stop
BOS12:05 amBoston Logan Intl
$327
Southwest
Apr 3
BOS12:55 pmBoston Logan Intl
12h 10m
2 stops
ONT10:05 pmOntario
Apr 7
ONT1:55 pmOntario
7h 10m
1 stop
BOS12:05 amBoston Logan Intl
$333

United Airlines flights from Boston to Ontario

Our best United Airlines deals on Boston to Ontario flight tickets
United Airlines
Apr 1
BOS5:30 amBoston Logan Intl
9h 50m
1 stop
ONT12:20 pmOntario
Apr 8
ONT6:49 pmOntario
10h 35m
1 stop
BOS8:24 amBoston Logan Intl
$254
United Airlines
May 14
BOS1:30 pmBoston Logan Intl
11h 28m
1 stop
ONT9:58 pmOntario
May 18
ONT6:59 pmOntario
10h 24m
1 stop
BOS8:23 amBoston Logan Intl
$280
United Airlines
May 14
BOS1:30 pmBoston Logan Intl
11h 28m
1 stop
ONT9:58 pmOntario
May 19
ONT7:00 amOntario
7h 22m
1 stop
BOS5:22 pmBoston Logan Intl
$285

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 February 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

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 4/1

5:30 am-12:20 pm

1 stop9h 50m

Ontario

Wed 4/8

6:49 pm-8:24 am

1 stop10h 35m

$254

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 3/11

7:00 am-3:08 pm

1 stop11h 08m

Ontario

Tue 3/17

4:02 pm-6:54 am

1 stop11h 52m

$259

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 3/17

2:40 pm-10:07 pm

2 stops10h 27m

Ontario

Tue 3/24

5:02 pm-5:34 am

1 stop9h 32m

$264

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Fri 5/15

2:55 pm-10:09 pm

1 stop10h 14m

Ontario

Mon 5/18

11:25 pm-10:38 am

1 stop8h 13m

$269

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 3/10

7:00 am-3:08 pm

1 stop11h 08m

Ontario

Tue 3/17

4:02 pm-6:54 am

1 stop11h 52m

$278

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 5/14

1:30 pm-9:58 pm

1 stop11h 28m

Ontario

Mon 5/18

6:59 pm-8:23 am

1 stop10h 24m

$280

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 3/26

7:10 am-5:13 pm

1 stop13h 03m

Ontario

Tue 3/31

5:53 pm-6:50 am

1 stop9h 57m

$283

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 5/14

1:30 pm-9:58 pm

1 stop11h 28m

Ontario

Tue 5/19

7:00 am-5:22 pm

1 stop7h 22m

$285

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Mon 5/4

4:33 pm-11:59 pm

1 stop10h 26m

Ontario

Thu 5/7

7:59 pm-11:59 pm

1 stop25h 00m

$292

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 3/17

7:00 am-3:08 pm

1 stop11h 08m

Ontario

Tue 4/7

10:33 am-11:59 pm

1 stop10h 26m

$295

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 $346. 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 $405 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 February 2026, prices for Boston to Ontario flights are approximately 8% 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 43m

Direct flights

None
The fastest flight from Boston to Ontario takes 7h 43m
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 43m.

  • 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
8,241 reviews
Search Delta flights
United AirlinesPriceFrom $239Free CancellationRating
7.4
9,341 reviews
Search United Airlines flights
American AirlinesPriceFrom $259Free CancellationRating
7.2
11,338 reviews
Search American Airlines flights
JetBluePriceFrom $270Free CancellationRating
7.2
2,898 reviews
Search JetBlue flights
SouthwestPriceFrom $317Free CancellationRating
8.0
4,299 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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