Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Boston to Los Angeles from $120

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 5/4. 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
0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Boston to Los Angeles

Cheap round-trip flights

Enter your travel dates to find the best prices.
Southwest Logo
2:20 pm - 10:00 pm
BOS
-
ONT
10h 40m
1 stop
Southwest Logo
9:55 pm - 8:05 am
ONT
-
BOS
7h 10m
1 stop
$239Southwest
Sat, May 2 - Wed, May 6
Southwest Logo
5:15 am - 12:15 pm
BOS
-
ONT
10h 00m
2 stops
Southwest Logo
9:55 pm - 8:05 am
ONT
-
BOS
7h 10m
1 stop
$244Southwest
Sat, May 2 - Wed, May 6
Southwest Logo
7:20 am - 3:15 pm
BOS
-
ONT
10h 55m
1 stop
Southwest Logo
9:55 pm - 8:05 am
ONT
-
BOS
7h 10m
1 stop
$250Southwest
Mon, Apr 13 - Wed, Apr 15
Southwest Logo
7:20 am - 3:15 pm
BOS
-
ONT
10h 55m
1 stop
Southwest Logo
6:30 am - 6:35 pm
ONT
-
BOS
9h 05m
2 stops
$255Southwest
Mon, Apr 13 - Wed, Apr 15
Alaska Airlines Logo
4:33 pm - 11:59 pm
BOS
-
ONT
10h 26m
1 stop
Alaska Airlines Logo
10:39 am - 11:59 pm
ONT
-
BOS
10h 20m
1 stop
$259Alaska Airlines
Fri, May 1 - Tue, May 5
American Airlines Logo
8:26 am - 4:22 pm
BOS
-
ONT
10h 56m
1 stop
American Airlines Logo
10:36 pm - 11:36 am
ONT
-
BOS
10h 00m
1 stop
$260American Airlines
Tue, Mar 24 - Tue, Mar 31
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
Southwest Logo
2:20 pm - 10:00 pm
BOS
-
ONT
10h 40m
1 stop
Southwest Logo
10:40 am - 12:05 am
ONT
-
BOS
10h 25m
1 stop
$273Southwest
Sat, Apr 11 - Wed, Apr 15
Southwest Logo
5:15 am - 12:15 pm
BOS
-
ONT
10h 00m
2 stops
Southwest Logo
6:15 am - 6:35 pm
ONT
-
BOS
9h 20m
2 stops
$277Southwest
Sat, May 2 - Wed, May 6
Alaska Airlines Logo
4:33 pm - 11:59 pm
BOS
-
ONT
10h 26m
1 stop
Alaska Airlines Logo
10:39 am - 11:59 pm
ONT
-
BOS
10h 20m
1 stop
$278Alaska Airlines
Fri, May 1 - Mon, May 4

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 6
ONT9:55 pmOntario
7h 10m
1 stop
BOS8:05 amBoston Logan Intl
$239
Southwest
May 2
BOS5:15 amBoston Logan Intl
10h 00m
2 stops
ONT12:15 pmOntario
May 6
ONT9:55 pmOntario
7h 10m
1 stop
BOS8:05 amBoston Logan Intl
$244
Southwest
Apr 13
BOS7:20 amBoston Logan Intl
10h 55m
1 stop
ONT3:15 pmOntario
Apr 15
ONT9:55 pmOntario
7h 10m
1 stop
BOS8:05 amBoston Logan Intl
$250

Alaska Airlines flights from Boston to Ontario

Our best Alaska Airlines deals on Boston to Ontario flight tickets
Alaska Airlines
May 1
BOS4:33 pmBoston Logan Intl
10h 26m
1 stop
ONT11:59 pmOntario
May 5
ONT10:39 amOntario
10h 20m
1 stop
BOS11:59 pmBoston Logan Intl
$259
Alaska Airlines
May 1
BOS4:33 pmBoston Logan Intl
10h 26m
1 stop
ONT11:59 pmOntario
May 4
ONT10:39 amOntario
10h 20m
1 stop
BOS11:59 pmBoston Logan Intl
$278
Alaska Airlines
Mar 23
BOS6:10 pmBoston Logan Intl
18h 29m
1 stop
ONT9:39 amOntario
Apr 3
ONT5:49 pmOntario
9h 04m
1 stop
BOS5:53 amBoston Logan Intl
$292

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 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

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sat 5/2

2:20 pm-10:00 pm

1 stop10h 40m

Ontario

Wed 5/6

9:55 pm-8:05 am

1 stop7h 10m

$239

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sat 5/2

5:15 am-12:15 pm

2 stops10h 00m

Ontario

Wed 5/6

9:55 pm-8:05 am

1 stop7h 10m

$244

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Mon 4/13

7:20 am-3:15 pm

1 stop10h 55m

Ontario

Wed 4/15

9:55 pm-8:05 am

1 stop7h 10m

$250

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Mon 4/13

7:20 am-3:15 pm

1 stop10h 55m

Ontario

Wed 4/15

6:30 am-6:35 pm

2 stops9h 05m

$255

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Fri 5/1

4:33 pm-11:59 pm

1 stop10h 26m

Ontario

Tue 5/5

10:39 am-11:59 pm

1 stop10h 20m

$259

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 3/24

8:26 am-4:22 pm

1 stop10h 56m

Ontario

Tue 3/31

10:36 pm-11:36 am

1 stop10h 00m

$260

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

Sat 4/11

2:20 pm-10:00 pm

1 stop10h 40m

Ontario

Wed 4/15

10:40 am-12:05 am

1 stop10h 25m

$273

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sat 5/2

5:15 am-12:15 pm

2 stops10h 00m

Ontario

Wed 5/6

6:15 am-6:35 pm

2 stops9h 20m

$277

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Fri 5/1

4:33 pm-11:59 pm

1 stop10h 26m

Ontario

Mon 5/4

10:39 am-11:59 pm

1 stop10h 20m

$278

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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

8h 07m

Direct flights

None
The fastest flight from Boston to Ontario takes 8h 07m
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 8h 07m.

  • 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
8,243 reviews
Search Delta flights
United AirlinesPriceFrom $239Free CancellationRating
7.4
9,349 reviews
Search United Airlines flights
American AirlinesPriceFrom $259Free CancellationRating
7.2
11,357 reviews
Search American Airlines flights
JetBluePriceFrom $270Free CancellationRating
7.2
2,896 reviews
Search JetBlue flights
SouthwestPriceFrom $317Free CancellationRating
8.0
4,301 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

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sun 3/29
Sun 4/5
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States