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Ontario

$86+ 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 3/2. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — ONT
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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Cheap 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 January 29, 2026.

This United Airlines deal was found by Cheapflights users on 1/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/15:30 am
BOS
-
ONT
1 stop9h 44m
United Airlines
Wed 4/86:49 pm
ONT
-
BOS
1 stop10h 35m
United Airlines
Deal found 1/29$254
This Alaska Airlines deal was found by Cheapflights users on 1/28. 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 2/204:36 pm
BOS
-
ONT
1 stop10h 16m
Alaska Airlines
Wed 2/2512:02 pm
ONT
-
BOS
1 stop8h 57m
Alaska Airlines
Deal found 1/28$259
This United Airlines deal was found by Cheapflights users on 1/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/36:00 am
BOS
-
ONT
1 stop9h 38m
United Airlines
Tue 3/1011:59 pm
ONT
-
BOS
2 stops9h 57m
United Airlines
Deal found 1/27$264
This American Airlines deal was found by Cheapflights users on 1/27. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/36:00 am
BOS
-
ONT
2 stops10h 49m
American Airlines
Tue 3/1011:58 pm
ONT
-
BOS
2 stops9h 18m
American Airlines
Deal found 1/27$269
This Alaska Airlines deal was found by Cheapflights users on 1/28. 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.
Wed 2/257:00 am
BOS
-
ONT
1 stop11h 08m
Alaska Airlines
Fri 2/274:02 pm
ONT
-
BOS
1 stop11h 52m
Alaska Airlines
Deal found 1/28$276
This Alaska Airlines deal was found by Cheapflights users on 1/28. 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.
Tue 3/107:00 am
BOS
-
ONT
1 stop11h 08m
Alaska Airlines
Tue 3/174:02 pm
ONT
-
BOS
1 stop11h 52m
Alaska Airlines
Deal found 1/28$278
This United Airlines deal was found by Cheapflights users on 1/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/16:00 am
BOS
-
ONT
1 stop9h 22m
United Airlines
Mon 5/46:59 pm
ONT
-
BOS
1 stop10h 24m
United Airlines
Deal found 1/27$288
This JetBlue deal was found by Cheapflights users on 1/28. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/152:55 pm
BOS
-
ONT
1 stop10h 14m
JetBlue
Mon 5/1811:25 pm
ONT
-
BOS
1 stop8h 13m
JetBlue
Deal found 1/28$293
This United Airlines deal was found by Cheapflights users on 1/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/256:00 am
BOS
-
ONT
2 stops9h 43m
United Airlines
Wed 3/45:00 am
ONT
-
BOS
2 stops10h 41m
United Airlines
Deal found 1/27$294
This Delta deal was found by Cheapflights users on 1/27. 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.
Mon 3/26:37 pm
BOS
-
ONT
1 stop8h 12m
Delta
Mon 3/910:25 pm
ONT
-
BOS
1 stop8h 39m
Delta
Deal found 1/27$297
This Southwest deal was found by Cheapflights users on 1/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/256:50 am
BOS
-
ONT
1 stop10h 45m
Southwest
Wed 3/410:40 am
ONT
-
BOS
2 stops8h 50m
Southwest
Deal found 1/27$298
This Alaska Airlines deal was found by Cheapflights users on 1/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/264:36 pm
BOS
-
ONT
1 stop10h 16m
Alaska Airlines
Tue 3/312:02 pm
ONT
-
BOS
1 stop8h 57m
Alaska Airlines
Deal found 1/27$299

Find 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 January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$259
(Alaska Airlines)

One-way from

$86
(Kiwi.com)

Popular in

December

Cheapest in

May

Average price

$368
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. 13% potential increase in price ($62 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($17 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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 January 29, 2026.
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 3/5

4:36 pm-11:52 pm

1 stop10h 16m

Ontario

Wed 3/11

4:02 pm-6:54 am

1 stop11h 52m

$259

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 3/3

9:02 am-10:44 pm

1 stop16h 42m

Ontario

Tue 3/10

12:02 pm-11:59 pm

1 stop8h 57m

$259

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Mon 3/9

4:30 pm-10:18 pm

1 stop8h 48m

Ontario

Mon 3/16

11:59 pm-12:56 pm

2 stops9h 57m

$264

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Mon 3/9

6:44 pm-11:51 pm

1 stop8h 07m

Ontario

Sat 3/14

5:53 pm-6:49 am

1 stop9h 56m

$297

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 2/26

7:15 am-1:54 pm

1 stop9h 39m

Ontario

Tue 3/3

1:15 pm-1:09 am

1 stop8h 54m

$297

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Fri 4/24

3:00 pm-9:00 pm

1 stop9h 00m

Ontario

Tue 4/28

10:15 pm-10:38 am

1 stop9h 23m

$297

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Mon 3/2

6:37 pm-11:49 pm

1 stop8h 12m

Ontario

Wed 3/4

1:15 pm-1:09 am

1 stop8h 54m

$297

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 2/25

6:50 am-2:35 pm

1 stop10h 45m

Ontario

Wed 3/4

10:40 am-10:30 pm

2 stops8h 50m

$298

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 2/24

7:00 am-3:08 pm

1 stop11h 08m

Ontario

Fri 3/6

4:02 pm-6:54 am

1 stop11h 52m

$299

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 3/5

4:36 pm-11:52 pm

1 stop10h 16m

Ontario

Tue 3/10

4:02 pm-6:54 am

1 stop11h 52m

$299

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/28

Showing 1-10 of 24 results
1
2
3

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 January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice 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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Boston-Ontario flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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 January 23, 2026.

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 61 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 December is currently the most expensive (average of $179). 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.

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 January 29, 2026.
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
4,267 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

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
4,267 reviews
Southwest
8.0
Very good
4,267 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

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
7.9
Good
8,127 reviews
Southwest
8.0
Very good
4,267 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

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
9,215 reviews
Southwest
8.0
Very good
4,267 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

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
11,206 reviews
Southwest
8.0
Very good
4,267 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

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
2,891 reviews
Southwest
8.0
Very good
4,267 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

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, United Airlines, and Delta fly from Boston to Ontario in about 8h 07m. The time it takes to get you to your destination can typically vary by up to 2h 09m. 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 $149, 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 $239 and $270, respectively. Users have found that Delta is 63% 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 JetBlue. According to our data, you can fly for as low as $118. Users have also found prices from $129 and $129 on United Airlines and American 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 $115). Flying from Boston to Ontario in December is currently the most expensive (average of $179). 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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Alternative routes for Boston to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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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 January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$149Average$409FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$239Average$417FlexibilityNo cancel feeOn-time69%
JetBlueCheapest$270Average$339FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$278Average$365FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$328Average$455FlexibilityNo cancel feeOn-time63%

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