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Ontario

$128+ Cheap flights from Boston to Ontario (BOS - ONT)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/19. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — ONT
oct. 16 — oct. 231
jue. 10/16
jue. 10/23
1 adult, Economy
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Cheapflights Tip: The best prices from Boston Logan Intl to Ontario are usually found in May or January, booked 32 days in advance, depart on a Tuesday or Thursday and return on a Tuesday

Cheap flight deals from Boston to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Boston (BOS) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated septiembre 16, 2025.

Round-trip from

$244
(Frontier)

One-way from

$128
(Hawaiian Airlines)

Popular in

December

Cheapest in

May

Average price

$387
From Boston Logan Intl to Ontario
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One-way flight from Boston Logan Intl to Ontario
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Highest demand for flights based on searches. 5% potential increase in price ($24 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($14 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Boston to Ontario

Cheapest flights from Boston to Ontario
Explore the most affordable flight options available from Boston to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on septiembre 16, 2025.

This Frontier deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/210:13 amBOS - ONT
2 stops11h 22mFrontier
vie. 10/312:28 pmONT - BOS
2 stops16h 43mFrontier
Deal found 9/16$244
This American Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/77:55 amBOS - ONT
1 stop11h 33mAmerican Airlines
mar. 10/216:15 amONT - BOS
1 stop7h 58mAmerican Airlines
Deal found 9/14$257
This Frontier deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/3012:20 pmBOS - ONT
2 stops14h 30mFrontier
jue. 11/612:05 pmONT - BOS
2 stops16h 47mFrontier
Deal found 9/15$258
This Alaska Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 11/187:00 amBOS - ONT
1 stop11h 17mAlaska Airlines
jue. 12/47:32 pmONT - BOS
1 stop9h 08mAlaska Airlines
Deal found 9/16$266
This American Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/235:30 amBOS - ONT
1 stop9h 28mAmerican Airlines
mié. 10/2910:57 amONT - BOS
1 stop7h 51mAmerican Airlines
Deal found 9/15$268
This American Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/41:37 pmBOS - ONT
1 stop10h 30mAmerican Airlines
lun. 12/810:34 pmONT - BOS
1 stop8h 57mAmerican Airlines
Deal found 9/14$277
This Hawaiian Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 11/47:00 amBOS - ONT
1 stop11h 17mHawaiian Airlines
vie. 11/1411:59 amONT - BOS
1 stop9h 21mHawaiian Airlines
Deal found 9/15$283
This Alaska Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/307:00 amBOS - ONT
1 stop11h 17mAlaska Airlines
mar. 11/411:59 amONT - BOS
1 stop9h 21mAlaska Airlines
Deal found 9/16$286
This Southwest deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/313:55 pmBOS - ONT
1 stop8h 10mSouthwest
dom. 11/28:25 pmONT - BOS
2 stops8h 50mSouthwest
Deal found 9/14$288
This Alaska Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/127:00 amBOS - ONT
1 stop11h 17mAlaska Airlines
mié. 11/1911:59 amONT - BOS
1 stop9h 21mAlaska Airlines
Deal found 9/15$291

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated septiembre 16, 2025.
Use the filters below to find and compare flights from Boston to Ontario that are best for you.

Fly from

Boston

Fly to

Ontario

Route

Depart

Return

Price

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

mar. 1/6

5:12 pm-11:59 pm

1 stop9h 47m

Ontario

mié. 1/21

11:30 am-11:59 pm

1 stop9h 29m

$277

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

vie. 10/31

5:00 am-1:10 pm

2 stops11h 10m

Ontario

dom. 11/2

8:25 pm-8:15 am

2 stops8h 50m

$293

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

sáb. 10/18

2:45 pm-9:29 pm

1 stop9h 44m

Ontario

mié. 10/22

10:56 pm-11:45 am

1 stop9h 49m

$295

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

mié. 12/3

6:10 am-12:22 pm

1 stop9h 12m

Ontario

mié. 2/4

6:00 am-4:44 pm

1 stop7h 44m

$297

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

sáb. 1/17

1:55 pm-9:14 pm

1 stop10h 19m

Ontario

lun. 1/26

5:05 pm-6:13 am

1 stop10h 08m

$297

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

mié. 1/7

6:00 am-12:34 pm

1 stop9h 34m

Ontario

sáb. 1/17

4:00 pm-6:32 am

1 stop11h 32m

$297

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

sáb. 12/6

6:10 am-12:22 pm

1 stop9h 12m

Ontario

vie. 1/30

10:30 pm-10:02 am

1 stop8h 32m

$297

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

mié. 1/7

5:40 am-11:38 am

1 stop8h 58m

Ontario

mié. 1/21

6:00 am-4:44 pm

1 stop7h 44m

$297

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

mié. 12/3

6:10 am-12:22 pm

1 stop9h 12m

Ontario

jue. 1/29

5:05 pm-6:13 am

1 stop10h 08m

$297

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

sáb. 12/6

6:10 am-12:22 pm

1 stop9h 12m

Ontario

lun. 2/2

10:30 pm-10:02 am

1 stop8h 32m

$297

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 23 results
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Best time to book a flight from Boston to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Boston with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Boston to Ontario

How far ahead should I book a flight from Boston to Ontario?

Use this chart to determine the optimal time to book a round-trip flight from Boston to Ontario. Price data was last updated on September 12, 2025.

The price you pay for your flight from Boston to Ontario may vary depending on when you book. For the best chance of a lower fare, look to book 32 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Boston to Ontario?

Currently, August is the cheapest month in which you can book a flight from Boston to Ontario (average of $246). Flying from Boston to Ontario in March is currently the most expensive (average of $327). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from BOS to ONT?

Find hourly flight availability from Boston to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated septiembre 16, 2025.

Unlike in the evening, when flights are generally more expensive, you can save up to 23% on flights from Boston to Ontario by exploring options for tickets at noon.

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated septiembre 16, 2025.
Get a feel of what it's like to fly with Southwest, Delta, and United Airlines from Boston to Ontario by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
8.0
Very good
7,957 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,924 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
JetBlue
7.2
Good
2,914 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from Boston to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Boston to Ontario?

    Airlines like Alaska Airlines, Southwest, and JetBlue fly from Boston to Ontario in about 9h 44m. The time it takes to get you to your destination can typically vary by up to 1h 26m. There are 2559 mi between Boston and Ontario. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Boston to Ontario round-trip?

    Currently priced at $198, Delta will fly you from Boston to Ontario and back. In addition to Delta, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from United Airlines and JetBlue - these airlines can fly you to your destination from $268 and $270, respectively. Users have found that Delta is 51% cheaper than the other options available to this destination.

  • Can I find deals for flights from Boston to Ontario that include hotel bookings?

    Yes. In addition to deals on Boston to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Boston to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Boston to Ontario.

  • Can I find deals for business class flights from Boston to Ontario?

    Yes. Cheapflights offers flight deals from Boston to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Boston to Ontario?

    Currently, August is the cheapest month in which you can book a flight from Boston to Ontario (average of $246). Flying from Boston to Ontario in March is currently the most expensive (average of $327). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Top 5 airlines flying from Boston to Ontario

Discover the top 5 airlines that operate flights from Boston to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated septiembre 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$198Average$437FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$268Average$427FlexibilityNo cancel feeOn-time69%
JetBlueCheapest$270Average$335FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$288Average$370FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$308Average$452FlexibilityNo cancel feeOn-time63%

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