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Ontario

$100+ 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 1/13. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — ONT
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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Find cheap flights from Boston to Ontario with Cheapflights

1. Tell us where you want to go

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Cheapflights Tip: The best prices from Boston Logan Intl to Ontario are usually found in January or May, booked 32 days in advance, depart on a Tuesday or Thursday and return on a Tuesday

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 October 30, 2025.

This American Airlines deal was found by Cheapflights users on 10/29. 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.
Thu 11/208:52 amBOS - ONT
1 stop10h 09mAmerican Airlines
Thu 11/276:11 amONT - BOS
1 stop7h 07mAmerican Airlines
Deal found 10/29$292
This Delta deal was found by Cheapflights users on 10/27. 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.
Wed 11/196:10 amBOS - ONT
1 stop9h 08mDelta
Thu 11/276:00 amONT - BOS
1 stop7h 10mDelta
Deal found 10/27$297
This Delta deal was found by Cheapflights users on 10/28. 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.
Thu 11/205:40 amBOS - ONT
1 stop8h 26mDelta
Wed 12/31:29 pmONT - BOS
1 stop7h 12mDelta
Deal found 10/28$324
This American Airlines deal was found by Cheapflights users on 10/29. 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.
Thu 11/206:05 amBOS - ONT
1 stop8h 58mAmerican Airlines
Mon 11/2412:55 pmONT - BOS
1 stop7h 40mAmerican Airlines
Deal found 10/29$326
This American Airlines deal was found by Cheapflights users on 10/29. 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.
Thu 12/119:19 amBOS - ONT
1 stop9h 43mAmerican Airlines
Thu 12/259:53 amONT - BOS
1 stop7h 17mAmerican Airlines
Deal found 10/29$330
This Alaska Airlines deal was found by Cheapflights users on 10/28. 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 12/56:59 pmBOS - ONT
1 stop19h 20mAlaska Airlines
Wed 12/246:05 pmONT - BOS
1 stop9h 05mAlaska Airlines
Deal found 10/28$333
This American Airlines deal was found by Cheapflights users on 10/28. 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.
Fri 12/57:30 amBOS - ONT
1 stop9h 25mAmerican Airlines
Wed 12/249:53 amONT - BOS
1 stop7h 17mAmerican Airlines
Deal found 10/28$334
This United Airlines deal was found by Cheapflights users on 10/28. 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.
Tue 11/181:32 pmBOS - ONT
1 stop11h 17mUnited Airlines
Sun 11/231:40 pmONT - BOS
1 stop8h 08mUnited Airlines
Deal found 10/28$336
This Delta deal was found by Cheapflights users on 10/28. 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.
Sun 11/236:10 amBOS - ONT
1 stop9h 08mDelta
Thu 11/276:00 amONT - BOS
1 stop7h 10mDelta
Deal found 10/28$338

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 October 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$292
(American Airlines)

One-way from

$100
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$430
Provider with most accurate pricing for Boston Logan Intl-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Boston Logan Intl-Ontario flights.
Search Deals
From Boston Logan Intl to Ontario
Search Deals
One-way flight from Boston Logan Intl to Ontario
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($37 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($14 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

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 October 30, 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

Thu 12/11

6:10 am-12:34 pm

1 stop9h 24m

Ontario

Thu 12/25

1:15 pm-12:24 am

1 stop8h 09m

$334

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 11/19

6:10 am-12:18 pm

1 stop9h 08m

Ontario

Wed 11/26

10:25 pm-10:37 am

1 stop9h 12m

$338

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 12/17

6:10 am-12:34 pm

1 stop9h 24m

Ontario

Tue 1/6

1:04 pm-1:04 am

1 stop9h 00m

$385

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 12/24

4:15 pm-10:25 pm

1 stop9h 10m

Ontario

Thu 12/25

5:05 am-9:55 pm

1 stop13h 50m

$436

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 11/20

10:25 am-10:31 pm

2 stops15h 06m

Ontario

Mon 11/24

1:40 pm-12:48 am

1 stop8h 08m

$441

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 11/18

12:00 pm-8:44 pm

2 stops11h 44m

Ontario

Sun 11/23

6:38 pm-10:34 am

2 stops12h 56m

$446

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 12/17

3:32 pm-9:49 pm

1 stop9h 17m

Ontario

Tue 12/30

11:59 pm-2:20 pm

2 stops11h 21m

$456

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 12/16

12:50 pm-10:49 pm

2 stops12h 59m

Ontario

Mon 12/22

6:39 pm-12:43 pm

2 stops15h 04m

$461

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 12/17

3:32 pm-9:49 pm

1 stop9h 17m

Ontario

Sun 1/4

11:59 pm-12:53 pm

1 stop9h 54m

$465

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 12/16

6:00 am-12:17 pm

1 stop9h 17m

Ontario

Sun 1/4

11:59 pm-11:08 am

1 stop8h 09m

$465

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/30

Showing 1-10 of 22 results
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Compare providers for flights from Boston to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Boston to Ontario in October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Boston-Ontario flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Boston-Ontario flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Boston-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Boston-Ontario flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Boston-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 October 24, 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 $115). Flying from Boston to Ontario in April is currently the most expensive (average of $177). 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 October 30, 2025.

Unlike in the evening, when flights are generally more expensive, you can save up to 22% 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 October 30, 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
4,243 reviews

Comfort

8.0

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Food

7.0

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
4,243 reviews
Southwest
8.0
Very good
4,243 reviews

Comfort

8.0

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Food

7.0

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
7.9
Good
7,998 reviews
Southwest
8.0
Very good
4,243 reviews

Comfort

8.0

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Food

7.0

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
8,998 reviews
Southwest
8.0
Very good
4,243 reviews

Comfort

8.0

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Food

7.0

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
11,035 reviews
Southwest
8.0
Very good
4,243 reviews

Comfort

8.0

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Food

7.0

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
2,906 reviews
Southwest
8.0
Very good
4,243 reviews

Comfort

8.0

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Food

7.0

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 Delta and United Airlines fly from Boston to Ontario in about 9h 10m. The time it takes to get you to your destination can typically vary by up to 14m. 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 $115). Flying from Boston to Ontario in April is currently the most expensive (average of $177). 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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$198Average$436FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$268Average$422FlexibilityNo cancel feeOn-time69%
JetBlueCheapest$270Average$339FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$296Average$374FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$335Average$454FlexibilityNo cancel feeOn-time63%

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