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Cheap flights from Boston to Los Angeles from $89

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 1/28. 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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Cheap round-trip flights

Enter your travel dates to find the best prices.
Southwest Logo
5:55 am - 11:10 amBOS-ONT
8h 15m1 stop
Southwest Logo
11:30 am - 9:55 pmONT-BOS
7h 25m1 stop
$247Southwest
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Sat, Dec 6 - Sat, Dec 13
Southwest Logo
5:20 am - 12:50 pmBOS-ONT
10h 30m2 stops
Southwest Logo
5:20 am - 3:50 pmONT-BOS
7h 30m1 stop
$253Southwest
Find Deal
Sat, Dec 6 - Sat, Dec 13
American Airlines Logo
5:21 am - 1:55 pmBOS-ONT
11h 34m1 stop
American Airlines Logo
11:59 pm - 1:37 pmONT-BOS
10h 38m1 stop
$265American Airlines
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Sat, Dec 6 - Sun, Dec 14
American Airlines Logo
8:00 am - 4:02 pmBOS-ONT
11h 02m2 stops
American Airlines Logo
11:59 pm - 1:37 pmONT-BOS
10h 38m1 stop
$270American Airlines
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Sat, Dec 6 - Sun, Dec 14
United Airlines Logo
6:00 am - 12:18 pmBOS-ONT
9h 18m1 stop
United Airlines Logo
6:41 pm - 7:36 amONT-BOS
9h 55m1 stop
$279United Airlines
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Thu, Dec 4 - Mon, Dec 8
Alaska Airlines Logo
7:00 am - 3:08 pmBOS-ONT
11h 08m1 stop
Alaska Airlines Logo
11:53 am - 11:59 pmONT-BOS
9h 06m1 stop
$292Alaska Airlines
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Mon, Feb 2 - Thu, Feb 5
Delta Logo
6:10 am - 12:34 pmBOS-ONT
9h 24m1 stop
Delta Logo
10:25 pm - 11:15 amONT-BOS
9h 50m1 stop
$297Delta
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Thu, Dec 4 - Mon, Dec 8
United Airlines Logo
2:21 pm - 10:31 pmBOS-ONT
11h 10m2 stops
United Airlines Logo
1:40 pm - 12:48 amONT-BOS
8h 08m1 stop
$298United Airlines
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Wed, Nov 12 - Fri, Nov 14
Delta Logo
6:53 pm - 11:52 pmBOS-ONT
7h 59m1 stop
Delta Logo
6:00 am - 4:10 pmONT-BOS
7h 10m1 stop
$302Delta
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Tue, Nov 18 - Thu, Nov 27
Alaska Airlines Logo
4:46 pm - 11:56 pmBOS-ONT
10h 10m1 stop
Alaska Airlines Logo
11:59 am - 12:20 amONT-BOS
9h 21m1 stop
$306Alaska Airlines
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Fri, Nov 14 - Tue, Nov 18

Southwest flights from Boston to Ontario

Our best Southwest deals on Boston to Ontario flight tickets
Southwest
Dec 6
BOS5:55 amBoston Logan Intl
8h 15m
1 stop
ONT11:10 amOntario
Dec 13
ONT11:30 amOntario
7h 25m
1 stop
BOS9:55 pmBoston Logan Intl
$247
Find similar
Southwest
Dec 6
BOS5:20 amBoston Logan Intl
10h 30m
2 stops
ONT12:50 pmOntario
Dec 13
ONT5:20 amOntario
7h 30m
1 stop
BOS3:50 pmBoston Logan Intl
$253
Find similar
Southwest
Jan 23
BOS5:30 amBoston Logan Intl
13h 35m
2 stops
ONT4:05 pmOntario
Jan 26
ONT5:45 pmOntario
12h 05m
2 stops
BOS8:50 amBoston Logan Intl
$324
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American Airlines flights from Boston to Ontario

Our best American Airlines deals on Boston to Ontario flight tickets
American Airlines
Dec 6
BOS5:21 amBoston Logan Intl
11h 34m
1 stop
ONT1:55 pmOntario
Dec 14
ONT11:59 pmOntario
10h 38m
1 stop
BOS1:37 pmBoston Logan Intl
$265
Find similar
American Airlines
Dec 6
BOS8:00 amBoston Logan Intl
11h 02m
2 stops
ONT4:02 pmOntario
Dec 14
ONT11:59 pmOntario
10h 38m
1 stop
BOS1:37 pmBoston Logan Intl
$270
Find similar
American Airlines
Jan 23
BOS12:29 pmBoston Logan Intl
8h 51m
1 stop
ONT6:20 pmOntario
Jan 26
ONT11:59 pmOntario
14h 21m
1 stop
BOS5:20 pmBoston Logan Intl
$275
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 October 23, 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

Sat 12/6

5:55 am-11:10 am

1 stop8h 15m

Ontario

Sat 12/13

11:30 am-9:55 pm

1 stop7h 25m

$247

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sat 12/6

5:20 am-12:50 pm

2 stops10h 30m

Ontario

Sat 12/13

5:20 am-3:50 pm

1 stop7h 30m

$253

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sat 12/6

5:21 am-1:55 pm

1 stop11h 34m

Ontario

Sun 12/14

11:59 pm-1:37 pm

1 stop10h 38m

$265

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sat 12/6

8:00 am-4:02 pm

2 stops11h 02m

Ontario

Sun 12/14

11:59 pm-1:37 pm

1 stop10h 38m

$270

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 12/4

6:00 am-12:18 pm

1 stop9h 18m

Ontario

Mon 12/8

6:41 pm-7:36 am

1 stop9h 55m

$279

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Mon 2/2

7:00 am-3:08 pm

1 stop11h 08m

Ontario

Thu 2/5

11:53 am-11:59 pm

1 stop9h 06m

$292

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 12/4

6:10 am-12:34 pm

1 stop9h 24m

Ontario

Mon 12/8

10:25 pm-11:15 am

1 stop9h 50m

$297

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 11/12

2:21 pm-10:31 pm

2 stops11h 10m

Ontario

Fri 11/14

1:40 pm-12:48 am

1 stop8h 08m

$298

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 11/18

6:53 pm-11:52 pm

1 stop7h 59m

Ontario

Thu 11/27

6:00 am-4:10 pm

1 stop7h 10m

$302

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Fri 11/14

4:46 pm-11:56 pm

1 stop10h 10m

Ontario

Tue 11/18

11:59 am-12:20 am

1 stop9h 21m

$306

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, January 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 $353. If you aren’t able to travel during the month of January, then book flights to Ontario from Boston during May instead. Flights to Ontario in May, while not as cheap as those in January, still average around $358.

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 $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 $296 on momondo.

How have Boston to Ontario flight prices changed over time?

As of October 2025, prices for Boston to Ontario flights are approximately 20% 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 55m.

  • 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
7,982 reviews
Search Delta flights
United AirlinesPriceFrom $268Free CancellationRating
7.4
8,995 reviews
Search United Airlines flights
JetBluePriceFrom $270Free CancellationRating
7.2
2,908 reviews
Search JetBlue flights
American AirlinesPriceFrom $288Free CancellationRating
7.2
11,032 reviews
Search American Airlines flights
SouthwestPriceFrom $312Free CancellationRating
8.0
4,236 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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