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$139+ 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 9/13. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — ONT
Aug 6 — Aug 131
Wed 8/6
Wed 8/13
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 28 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 August 1, 2025.

Round-trip from

$256
(Rumbo)

One-way from

$139
(American Airlines)

Popular in

December

Cheapest in

May

Average price

$362
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. 4% potential increase in price ($20 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 August 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 August 1, 2025.

This Rumbo deal was found by Cheapflights users on 7/30. 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 Rumbo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/302:40 pmBOS - ONT
1 stop10h 19mJetBlue
Fri 9/510:56 pmONT - BOS
1 stop7h 38mJetBlue
Deal found 7/30$256
This American Airlines deal was found by Cheapflights users on 7/29. 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.
Sat 11/12:45 pmBOS - ONT
1 stop8h 19mAmerican Airlines
Sat 11/812:53 pmONT - BOS
1 stop7h 09mAmerican Airlines
Deal found 7/29$275
This Southwest deal was found by Cheapflights users on 7/30. 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 12/46:45 amBOS - ONT
1 stop10h 45mSouthwest
Mon 12/811:15 amONT - BOS
1 stop8h 30mSouthwest
Deal found 7/30$293
This Alaska Airlines deal was found by Cheapflights users on 7/29. 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.
Tue 9/97:20 amBOS - ONT
1 stop9h 52mAlaska Airlines
Wed 9/1711:39 amONT - BOS
1 stop9h 48mAlaska Airlines
Deal found 7/29$294
This Delta deal was found by Cheapflights users on 7/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/25:35 amBOS - ONT
1 stop8h 00mDelta
Tue 9/97:05 amONT - BOS
1 stop8h 26mDelta
Deal found 7/30$296
This United Airlines deal was found by Cheapflights users on 7/31. 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.
Thu 11/2011:59 amBOS - ONT
2 stops11h 45mUnited Airlines
Mon 11/247:00 amONT - BOS
1 stop7h 15mUnited Airlines
Deal found 7/31$314
This Hawaiian Airlines deal was found by Cheapflights users on 7/29. 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.
Sat 11/17:00 amBOS - ONT
1 stop11h 17mHawaiian Airlines
Wed 11/511:59 amONT - BOS
1 stop9h 21mHawaiian Airlines
Deal found 7/29$346

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 August 1, 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

Sat 8/30

2:40 pm-9:59 pm

1 stop10h 19m

Ontario

Fri 9/5

10:56 pm-9:34 am

1 stop7h 38m

$256

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 8/26

1:40 pm-9:12 pm

1 stop10h 32m

Ontario

Tue 9/2

11:59 pm-1:45 pm

1 stop10h 46m

$277

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 9/9

7:20 am-2:12 pm

1 stop9h 52m

Ontario

Wed 9/17

11:39 am-12:27 am

1 stop9h 48m

$294

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 9/2

5:35 am-10:35 am

1 stop8h 00m

Ontario

Tue 9/9

7:05 am-6:31 pm

1 stop8h 26m

$296

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 10/23

3:50 pm-11:40 pm

2 stops10h 50m

Ontario

Mon 10/27

12:50 pm-11:55 pm

1 stop8h 05m

$308

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 8/14

1:35 pm-9:37 pm

1 stop11h 02m

Ontario

Wed 8/20

1:19 pm-11:46 pm

1 stop7h 27m

$352

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sat 9/13

8:05 am-1:54 pm

1 stop8h 49m

$139

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sun 8/31

6:10 am-12:14 pm

1 stop9h 04m

$149

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Fri 9/5

7:20 am-2:12 pm

1 stop9h 52m

$156

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Mon 9/29

5:35 am-11:35 am

1 stop9h 00m

$157

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

Showing 1-10 of 12 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 July 25, 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 28 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 $328). 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 August 1, 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 August 1, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest, and Delta 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.
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Entertainment

7.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Entertainment

7.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,246 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Entertainment

7.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,981 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Entertainment

7.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.8
Good
2,611 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Entertainment

7.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,900 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Entertainment

7.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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.

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

    Currently priced at $256, JetBlue will fly you from Boston to Ontario and back. In addition to JetBlue, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from American Airlines and Southwest - these airlines can fly you to your destination from $275 and $293, respectively. Users have found that JetBlue is 38% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from Boston to Ontario one-way?

    For one-way options, check prices for American Airlines. According to our data, you can fly for as low as $139. Users have also found prices from $149 and $156 on Delta and Alaska Airlines, respectively.

  • 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 $328). 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 August 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$176Average$325FlexibilityNo cancel feeOn-time62%
DeltaCheapest$198Average$439FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$268Average$440FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$298Average$395FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$306Average$446FlexibilityNo cancel feeOn-time63%

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