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Cheap flights from Boston to Los Angeles from $128

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 11/18. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Boston to Los Angeles (BOS-ONT)

Cheap round-trip flights

American Airlines Logo
5:30 am - 11:57 amBOS-ONT
9h 27m1 stop
American Airlines Logo
10:09 am - 9:25 pmONT-BOS
8h 16m1 stop
$257American Airlines
Find Deal
Tue, Oct 7 - Tue, Oct 21
American Airlines Logo
11:05 am - 6:35 pmBOS-ONT
10h 30m2 stops
American Airlines Logo
10:57 am - 11:27 pmONT-BOS
9h 30m1 stop
$262American Airlines
Find Deal
Tue, Oct 21 - Tue, Oct 28
United Airlines Logo
3:45 pm - 9:25 pmBOS-ONT
8h 40m1 stop
United Airlines Logo
6:50 pm - 6:01 amONT-BOS
8h 11m1 stop
$267United Airlines
Find Deal
Sat, Sep 20 - Wed, Sep 24
United Airlines Logo
2:40 pm - 10:30 pmBOS-ONT
10h 50m2 stops
United Airlines Logo
6:50 pm - 6:01 amONT-BOS
8h 11m1 stop
$272United Airlines
Find Deal
Sat, Sep 20 - Wed, Sep 24
JetBlue Logo
2:45 pm - 9:29 pmBOS-ONT
9h 44m1 stop
JetBlue Logo
10:56 pm - 9:34 amONT-BOS
7h 38m1 stop
$291JetBlue
Find Deal
Tue, Sep 16 - Sat, Sep 20
Southwest Logo
6:20 pm - 12:05 amBOS-ONT
8h 45m1 stop
Southwest Logo
8:30 am - 12:05 amONT-BOS
12h 35m1 stop
$292Southwest
Find Deal
Mon, Nov 10 - Thu, Nov 13
JetBlue Logo
12:20 pm - 9:29 pmBOS-ONT
12h 09m1 stop
JetBlue Logo
10:56 pm - 11:45 amONT-BOS
9h 49m1 stop
$295JetBlue
Find Deal
Wed, Sep 17 - Sun, Sep 21
Delta Logo
6:15 am - 12:14 pmBOS-ONT
8h 59m1 stop
Delta Logo
11:46 am - 11:51 pmONT-BOS
9h 05m1 stop
$297Delta
Find Deal
Wed, Nov 5 - Sat, Nov 15
Delta Logo
1:55 pm - 7:42 pmBOS-ONT
8h 47m1 stop
Delta Logo
12:00 pm - 1:00 amONT-BOS
10h 00m1 stop
$299Delta
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Sat, Dec 6 - Sat, Dec 13
Southwest Logo
5:55 am - 11:10 amBOS-ONT
8h 15m1 stop
Southwest Logo
10:50 am - 10:55 pmONT-BOS
9h 05m1 stop
$347Southwest
Find Deal
Sat, Nov 15 - Fri, Nov 28

American Airlines flights from Boston to Ontario

Our best American Airlines deals on Boston to Ontario flight tickets
American Airlines
Sep 3
BOS3:55 pmBoston Logan Intl
8h 29m
1 stop
ONT9:24 pmOntario
Sep 5
ONT1:10 pmOntario
7h 44m
1 stop
BOS11:54 pmBoston Logan Intl
$253
Find similar
American Airlines
Sep 4
BOS6:00 amBoston Logan Intl
8h 55m
1 stop
ONT11:55 amOntario
Sep 16
ONT1:10 pmOntario
7h 44m
1 stop
BOS11:54 pmBoston Logan Intl
$255
Find similar
American Airlines
Oct 7
BOS5:30 amBoston Logan Intl
9h 27m
1 stop
ONT11:57 amOntario
Oct 21
ONT10:09 amOntario
8h 16m
1 stop
BOS9:25 pmBoston Logan Intl
$257
Find similar

JetBlue flights from Boston to Ontario

Our best JetBlue deals on Boston to Ontario flight tickets
JetBlue
Sep 16
BOS2:45 pmBoston Logan Intl
9h 44m
1 stop
ONT9:29 pmOntario
Sep 20
ONT10:56 pmOntario
7h 38m
1 stop
BOS9:34 amBoston Logan Intl
$291
Find similar
JetBlue
Sep 17
BOS12:20 pmBoston Logan Intl
12h 09m
1 stop
ONT9:29 pmOntario
Sep 21
ONT10:56 pmOntario
9h 49m
1 stop
BOS11:45 amBoston Logan Intl
$295
Find similar
JetBlue
Sep 16
BOS2:45 pmBoston Logan Intl
9h 44m
1 stop
ONT9:29 pmOntario
Sep 24
ONT10:56 pmOntario
7h 38m
1 stop
BOS9:34 amBoston Logan Intl
$296
Find similar

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 26, 2025.
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 10/7

5:30 am-11:57 am

1 stop9h 27m

Ontario

Tue 10/21

10:09 am-9:25 pm

1 stop8h 16m

$257

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 10/21

11:05 am-6:35 pm

2 stops10h 30m

Ontario

Tue 10/28

10:57 am-11:27 pm

1 stop9h 30m

$262

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sat 9/20

3:45 pm-9:25 pm

1 stop8h 40m

Ontario

Wed 9/24

6:50 pm-6:01 am

1 stop8h 11m

$267

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sat 9/20

2:40 pm-10:30 pm

2 stops10h 50m

Ontario

Wed 9/24

6:50 pm-6:01 am

1 stop8h 11m

$272

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 9/16

2:45 pm-9:29 pm

1 stop9h 44m

Ontario

Sat 9/20

10:56 pm-9:34 am

1 stop7h 38m

$291

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Mon 11/10

6:20 pm-12:05 am

1 stop8h 45m

Ontario

Thu 11/13

8:30 am-12:05 am

1 stop12h 35m

$292

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 9/17

12:20 pm-9:29 pm

1 stop12h 09m

Ontario

Sun 9/21

10:56 pm-11:45 am

1 stop9h 49m

$295

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 11/5

6:15 am-12:14 pm

1 stop8h 59m

Ontario

Sat 11/15

11:46 am-11:51 pm

1 stop9h 05m

$297

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sat 12/6

1:55 pm-7:42 pm

1 stop8h 47m

Ontario

Sat 12/13

12:00 pm-1:00 am

1 stop10h 00m

$299

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sat 11/15

5:55 am-11:10 am

1 stop8h 15m

Ontario

Fri 11/28

10:50 am-10:55 pm

1 stop9h 05m

$347

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, 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 January instead. Flights to Ontario in January, while not as cheap as those in May, still average around $350.

What is the cheapest day to depart on your flight to Ontario?

The cheapest day to depart on your flight to Ontario is on a Tuesday when prices can be found for as low as $401. This is often the case because there is less demand to fly during this day of the week. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Boston to Ontario for around $569.

What is the cheapest time of day to depart on your flight to Ontario?

At noon is the cheapest time of day to fly from Boston to Ontario when you can find flight prices for as low as $428. Flying to Ontario at noon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are $552 on average. Flights to Ontario from Boston in the evening are generally more expensive because this time of day is more convenient for travelers’ schedules.

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 $406 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 $347 on momondo.

How have Boston to Ontario flight prices changed over time?

As of August 2025, prices for Boston to Ontario flights are approximately 42% 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

Direct flights

None
There are no direct flights from Boston to Ontario. There are no popular flight routes from Boston to Ontario.
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  • 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 47m.

  • 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 $198Free CancellationRating
7.9
7,979 reviews
Search Delta flights
JetBluePriceFrom $201Free CancellationRating
7.2
2,918 reviews
Search JetBlue flights
United AirlinesPriceFrom $268Free CancellationRating
7.4
8,943 reviews
Search United Airlines flights
American AirlinesPriceFrom $291Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $308Free CancellationRating
8.0
4,243 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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