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Cheap flights from Boston to Los Angeles from $122

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 9/10. 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 amBOS  Boston Logan Intl-ONT Ontario
7h 58m1 stop Dallas/Fort Worth
American Airlines Logo
1:04 pm - 11:30 pmONT  Ontario-BOS Boston Logan Intl
7h 26m1 stop Phoenix Sky Harbor Intl
$346American Airlines
Sat, Sep 5 - Fri, Sep 11
Delta Logo
5:30 am - 10:42 amBOS  Boston Logan Intl-ONT Ontario
8h 12m1 stop Atlanta Hartsfield-Jackson
Delta Logo
1:06 pm - 11:57 pmONT  Ontario-BOS Boston Logan Intl
7h 51m1 stop Salt Lake City
$347Delta
Sat, Sep 5 - Sun, Sep 6
American Airlines Logo
5:51 am - 11:43 amBOS  Boston Logan Intl-ONT Ontario
8h 52m1 stop Dallas/Fort Worth
American Airlines Logo
10:25 am - 9:27 pmONT  Ontario-BOS Boston Logan Intl
8h 02m1 stop Dallas/Fort Worth
$347American Airlines
Sat, Sep 5 - Fri, Sep 11
Delta Logo
5:30 am - 10:42 amBOS  Boston Logan Intl-ONT Ontario
8h 12m1 stop Atlanta Hartsfield-Jackson
Delta Logo
1:04 pm - 11:53 pmONT  Ontario-BOS Boston Logan Intl
7h 49m1 stop Salt Lake City
$347Delta
Sat, Sep 5 - Fri, Sep 11
United Airlines Logo
12:27 pm - 8:53 pmBOS  Boston Logan Intl-ONT Ontario
11h 26m2 stops Chicago O'Hare Intl Denver Intl
United Airlines Logo
7:00 am - 5:36 pmONT  Ontario-BOS Boston Logan Intl
7h 36m1 stop Chicago O'Hare Intl
$352United Airlines
Sat, Sep 5 - Fri, Sep 11
Alaska Airlines Logo
7:12 am - 2:16 pmBOS  Boston Logan Intl-ONT Ontario
10h 04m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
6:14 pm - 6:09 amONT  Ontario-BOS Boston Logan Intl
8h 55m1 stop Portland
$357Alaska Airlines
Fri, Sep 11 - Mon, Sep 14
Alaska Airlines Logo
4:48 pm - 11:24 pmBOS  Boston Logan Intl-ONT Ontario
9h 36m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
6:14 pm - 6:09 amONT  Ontario-BOS Boston Logan Intl
8h 55m1 stop Portland
$357Alaska Airlines
Fri, Sep 11 - Mon, Sep 14
Southwest Logo
1:30 pm - 7:20 pmBOS  Boston Logan Intl-ONT Ontario
8h 50m1 stop Denver Intl
Southwest Logo
8:40 pm - 9:55 amONT  Ontario-BOS Boston Logan Intl
10h 15m2 stops Phoenix Sky Harbor Intl Chicago Midway
$362Southwest
Fri, Sep 11 - Mon, Sep 14
Southwest Logo
5:40 am - 10:20 amBOS  Boston Logan Intl-ONT Ontario
7h 40m1 stop Denver Intl
Southwest Logo
11:55 pm - 12:15 pmONT  Ontario-BOS Boston Logan Intl
9h 20m1 stop Chicago Midway
$367Southwest
Thu, Sep 3 - Mon, Sep 21
United Airlines Logo
6:00 am - 12:18 pmBOS  Boston Logan Intl-ONT Ontario
9h 18m1 stop San Francisco
United Airlines Logo
9:25 am - 9:24 pmONT  Ontario-BOS Boston Logan Intl
8h 59m1 stop San Francisco
$367United Airlines
Fri, Oct 23 - Mon, Oct 26

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Alaska Airlines flights from Boston to Ontario

Our best Alaska Airlines deals on Boston to Ontario flight tickets
Alaska Airlines
Aug 27
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
$377
Alaska Airlines
Aug 27
BOS7:12 amBoston Logan Intl
9h 57m
1 stop
ONT2:09 pmOntario
Sep 1
ONT6:05 pmOntario
9h 04m
1 stop
BOS6:09 amBoston Logan Intl
$417
Alaska Airlines
Oct 30
BOS4:46 pmBoston Logan Intl
10h 08m
1 stop
ONT11:54 pmOntario
Nov 6
ONT12:00 pmOntario
8h 59m
1 stop
BOS11:59 pmBoston Logan Intl
$432

Delta flights from Boston to Ontario

Our best Delta deals on Boston to Ontario flight tickets
Delta
Sep 5
BOS5:30 amBoston Logan Intl
8h 12m
1 stop
ONT10:42 amOntario
Sep 11
ONT1:04 pmOntario
7h 49m
1 stop
BOS11:53 pmBoston Logan Intl
$347
Delta
Aug 31
BOS6:05 amBoston Logan Intl
9h 11m
1 stop
ONT12:16 pmOntario
Sep 5
ONT1:06 pmOntario
7h 51m
1 stop
BOS11:57 pmBoston Logan Intl
$357
Delta
Nov 7
BOS5:30 amBoston Logan Intl
8h 36m
1 stop
ONT11:06 amOntario
Nov 8
ONT6:01 pmOntario
10h 34m
1 stop
BOS7:35 amBoston Logan Intl
$367

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 August 9, 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 Boston Logan Intl - ONT Ontario

BOSONT

Boston Logan Intl

Sat 9/5

6:45 am-11:43 am

1 stop7h 58m

Ontario

Fri 9/11

1:04 pm-11:30 pm

1 stop7h 26m

$346

BostonOntario

BOS Boston Logan Intl - ONT Ontario

BOSONT

Boston Logan Intl

Sat 9/5

5:30 am-10:42 am

1 stop8h 12m

Ontario

Sun 9/6

1:06 pm-11:57 pm

1 stop7h 51m

$347

BostonOntario

BOS Boston Logan Intl - ONT Ontario

BOSONT

Boston Logan Intl

Sat 9/5

5:51 am-11:43 am

1 stop8h 52m

Ontario

Fri 9/11

10:25 am-9:27 pm

1 stop8h 02m

$347

BostonOntario

BOS Boston Logan Intl - ONT Ontario

BOSONT

Boston Logan Intl

Sat 9/5

5:30 am-10:42 am

1 stop8h 12m

Ontario

Fri 9/11

1:04 pm-11:53 pm

1 stop7h 49m

$347

BostonOntario

BOS Boston Logan Intl - ONT Ontario

BOSONT

Boston Logan Intl

Sat 9/5

12:27 pm-8:53 pm

2 stops11h 26m

Ontario

Fri 9/11

7:00 am-5:36 pm

1 stop7h 36m

$352

BostonOntario

BOS Boston Logan Intl - ONT Ontario

BOSONT

Boston Logan Intl

Fri 9/11

7:12 am-2:16 pm

1 stop10h 04m

Ontario

Mon 9/14

6:14 pm-6:09 am

1 stop8h 55m

$357

BostonOntario

BOS Boston Logan Intl - ONT Ontario

BOSONT

Boston Logan Intl

Fri 9/11

4:48 pm-11:24 pm

1 stop9h 36m

Ontario

Mon 9/14

6:14 pm-6:09 am

1 stop8h 55m

$357

BostonOntario

BOS Boston Logan Intl - ONT Ontario

BOSONT

Boston Logan Intl

Fri 9/11

1:30 pm-7:20 pm

1 stop8h 50m

Ontario

Mon 9/14

8:40 pm-9:55 am

2 stops10h 15m

$362

BostonOntario

BOS Boston Logan Intl - ONT Ontario

BOSONT

Boston Logan Intl

Thu 9/3

5:40 am-10:20 am

1 stop7h 40m

Ontario

Mon 9/21

11:55 pm-12:15 pm

1 stop9h 20m

$367

BostonOntario

BOS Boston Logan Intl - ONT Ontario

BOSONT

Boston Logan Intl

Fri 10/23

6:00 am-12:18 pm

1 stop9h 18m

Ontario

Mon 10/26

9:25 am-9:24 pm

1 stop8h 59m

$367

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 $373 to $772.
The lowest price recently found on this route was $346.

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 $492 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 August 2026, prices for Boston to Ontario flights are approximately 17% 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 12m

Direct flights

None
The fastest flight from Boston to Ontario takes 8h 12m
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 8h 12m.

  • 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
8,497 reviews
Search Delta flights
United AirlinesPriceFrom $239Free CancellationRating
7.4
10,088 reviews
Search United Airlines flights
American AirlinesPriceFrom $258Free CancellationRating
7.1
11,895 reviews
Search American Airlines flights
JetBluePriceFrom $298Free CancellationRating
7.1
3,032 reviews
Search JetBlue flights
SouthwestPriceFrom $307Free CancellationRating
8.0
4,216 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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