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$90+ Cheap flights from Ontario to Boston (ONT - BOS)

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 10/28. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BOS
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to Boston Logan Intl are usually found in September or August, booked 48 days in advance, depart on a Tuesday or Saturday and return on a Tuesday

Cheap flight deals from Ontario to Boston

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Boston (BOS). 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 September 11, 2025.

Round-trip from

$220
(Southwest)

One-way from

$90
(Southwest)

Popular in

November

Cheapest in

September

Average price

$364
From Ontario to Boston Logan Intl
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One-way flight from Ontario to Boston Logan Intl
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Highest demand for flights based on searches. 3% potential increase in price ($12 potential increase over avg. RT price).
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Cheapest flight prices on average. 0% potential price decrease ($5 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 Ontario to Boston

Cheapest flights from Ontario to Boston
Explore the most affordable flight options available from Ontario to Boston. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This Southwest deal was found by Cheapflights users on 9/9. 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.
Thu 11/132:15 pmONT - BOS
1 stop6h 50mSouthwest
Sat 11/155:20 amBOS - ONT
1 stop8h 25mSouthwest
Deal found 9/9$224
This Southwest deal was found by Cheapflights users on 9/9. 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.
Tue 10/2112:00 pmONT - BOS
1 stop7h 40mSouthwest
Thu 10/233:50 pmBOS - ONT
1 stop10h 00mSouthwest
Deal found 9/9$225
This Southwest deal was found by Cheapflights users on 9/11. 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.
Sat 10/187:45 amONT - BOS
1 stop10h 05mSouthwest
Sat 10/255:20 amBOS - ONT
1 stop8h 20mSouthwest
Deal found 9/11$234
This Southwest deal was found by Cheapflights users on 9/8. 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.
Fri 10/2412:50 pmONT - BOS
1 stop8h 05mSouthwest
Tue 10/285:15 amBOS - ONT
1 stop11h 15mSouthwest
Deal found 9/8$239
This Alaska Airlines deal was found by Cheapflights users on 9/10. 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.
Sat 11/1511:59 amONT - BOS
1 stop9h 21mAlaska Airlines
Tue 12/99:00 amBOS - ONT
1 stop12h 32mAlaska Airlines
Deal found 9/10$242
This United Airlines deal was found by Cheapflights users on 9/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/41:15 pmONT - BOS
1 stop7h 29mUnited Airlines
Wed 10/84:25 pmBOS - ONT
1 stop9h 05mUnited Airlines
Deal found 9/10$243
This Southwest deal was found by Cheapflights users on 9/9. 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.
Fri 11/72:15 pmONT - BOS
1 stop6h 50mSouthwest
Mon 11/106:20 pmBOS - ONT
1 stop8h 45mSouthwest
Deal found 9/9$250
This Southwest deal was found by Cheapflights users on 9/9. 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.
Mon 11/106:50 amONT - BOS
1 stop12h 40mSouthwest
Thu 11/136:20 pmBOS - ONT
1 stop8h 45mSouthwest
Deal found 9/9$253
This Alaska Airlines deal was found by Cheapflights users on 9/10. 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.
Fri 11/1411:59 amONT - BOS
1 stop9h 21mAlaska Airlines
Tue 12/99:00 amBOS - ONT
1 stop12h 32mAlaska Airlines
Deal found 9/10$254
This American Airlines deal was found by Cheapflights users on 9/10. 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.
Mon 11/310:34 pmONT - BOS
1 stop8h 55mAmerican Airlines
Wed 11/57:30 amBOS - ONT
1 stop9h 32mAmerican Airlines
Deal found 9/10$255

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Boston 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 September 11, 2025.
Use the filters below to find and compare flights from Ontario to Boston that are best for you.

Fly from

Ontario

Fly to

Boston

Route

Depart

Return

Price

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Wed 10/15

6:27 pm-6:00 am

1 stop8h 33m

Boston Logan Intl

Wed 11/5

4:10 pm-10:31 pm

1 stop9h 21m

$261

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Tue 11/4

11:59 am-12:20 am

1 stop9h 21m

Boston Logan Intl

Wed 11/12

7:00 am-3:17 pm

1 stop11h 17m

$274

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Wed 11/19

11:15 am-10:45 pm

1 stop8h 30m

Boston Logan Intl

Sun 11/23

5:15 am-12:25 pm

2 stops10h 10m

$284

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Sun 10/5

10:56 pm-11:45 am

1 stop9h 49m

Boston Logan Intl

Fri 10/10

2:45 pm-9:29 pm

1 stop9h 44m

$295

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Sat 10/11

7:02 am-5:51 pm

1 stop7h 49m

Boston Logan Intl

Wed 10/22

12:10 pm-8:24 pm

2 stops11h 14m

$296

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Tue 12/2

1:20 pm-11:40 pm

1 stop7h 20m

Boston Logan Intl

Fri 12/5

6:47 pm-11:59 pm

1 stop8h 12m

$297

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Wed 11/5

11:59 am-12:20 am

1 stop9h 21m

Boston Logan Intl

Thu 11/13

7:00 am-3:17 pm

1 stop11h 17m

$311

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Sat 9/27

1:15 pm-11:59 pm

1 stop7h 44m

Boston Logan Intl

Wed 10/1

6:10 am-12:17 pm

1 stop9h 07m

$312

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Thu 10/23

5:45 pm-6:00 am

1 stop9h 15m

Boston Logan Intl

Sat 11/1

7:00 am-3:17 pm

1 stop11h 17m

$316

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Mon 10/6

9:36 am-8:32 pm

1 stop7h 56m

Boston Logan Intl

Sat 10/11

12:34 pm-8:24 pm

2 stops10h 50m

$331

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 20 results
1
2

Best time to book a flight from Ontario to Boston

Have a flexible travel schedule? Discover the best time to fly to Boston from Ontario 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 Ontario to Boston

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

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Boston. Price data was last updated on August 29, 2025.

Booking 48 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario to Boston. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, January is the cheapest month in which you can book a flight from Ontario to Boston (average of $218). Flying from Ontario to Boston in July is currently the most expensive (average of $311). 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 ONT to BOS?

Find hourly flight availability from Ontario to Boston. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

It’s optimal to fly from Ontario to Boston in the afternoon. By choosing this option you can save up to 13% on the cost of your flight, compared to a flight in the morning.

What is the cheapest day to fly from Ontario to Boston?

Use this chart to determine the cheapest time to fly round-trip from Ontario to Boston. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Ontario to Boston flight should consider departing on Saturday at noon when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Boston

Get insights into the airlines that provide service to Boston. 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 Boston. Reviews last updated September 11, 2025.
Get a feel of what it's like to fly with Southwest, Delta, and United Airlines from Ontario to Boston 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
4,248 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

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
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

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
7,960 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

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
8,937 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

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
4,248 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

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
2,913 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

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 Ontario to Boston. 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 Ontario to Boston?

    A quick flight from Ontario to Boston can take about 8h 30m. United Airlines provides one of the quickest options available for as low as $284. The distance between Ontario and Boston is about 2559 mi. This flight may include one or multiple stops.

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

    According to our current data, Alaska Airlines ($131), Delta ($178), and JetBlue ($207) offers the cheapest pricing from Ontario to Boston. Alaska Airlines is priced at 68% lower than the current average price of a flight leaving 3 months from now.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Ontario to Boston 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 Ontario to Boston?

    Currently, January is the cheapest month in which you can book a flight from Ontario to Boston (average of $218). Flying from Ontario to Boston in July is currently the most expensive (average of $311). 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

Traveling to a place near Boston?

Book flights to Boston if you plan to visit one of these locations
Cambridge
Medford
Hampton Beach
Watertown
Seabrook
Seekonk
Lincoln
Lowell
Smithfield
Cranston
Chestnut Hill
Chelsea
Warwick
Peabody
Quincy
York Beach
Swansea
Waltham
Saugus
Burlington

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Top 6 airlines flying from Ontario to Boston

Discover the top 6 airlines that operate flights from Ontario to Boston. 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$131Average$328FlexibilityNo cancel feeOn-time75%
DeltaCheapest$178Average$340FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$207Average$332FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$271Average$424FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$298Average$417FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$308Average$434FlexibilityNo cancel feeOn-time63%

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