$99 Find Cheap Flights from Ontario to New Hampshire

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to New Hampshire departing on 2/24. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to New Hampshire

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to New Hampshire, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to New Hampshire, as well as popular online travel agencies
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Flight Deals

Cheap Flights from Ontario to New Hampshire

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Boston
Boston1 stop$237
Portland
Portland2 stops$302
Boston
Boston1 stop$237
Portland
Portland2 stops$302

Book Cheap Ontario to New Hampshire Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to New Hampshire that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to New Hampshire

Sat, Jan 24 - Thu, Jan 29
Delta Logo
3:30 pm - 6:50 am
ONT
-
BOS
12h 20m1 stop
Delta Logo
7:15 am - 1:56 pm
BOS
-
ONT
9h 41m1 stop
$237Delta
Tue, Jan 6 - Tue, Jan 13
American Airlines Logo
12:57 pm - 11:12 pm
ONT
-
BOS
7h 15m1 stop
American Airlines Logo
11:10 am - 6:20 pm
BOS
-
ONT
10h 10m2 stops
$242American Airlines
Fri, Jan 16 - Tue, Jan 20
American Airlines Logo
9:59 am - 10:19 pm
ONT
-
BOS
9h 20m2 stops
American Airlines Logo
11:10 am - 6:20 pm
BOS
-
ONT
10h 10m2 stops
$247American Airlines
Tue, May 12 - Tue, May 19
United Airlines Logo
6:54 pm - 8:23 am
ONT
-
BOS
10h 29m1 stop
United Airlines Logo
4:25 pm - 10:26 pm
BOS
-
ONT
9h 01m1 stop
$254United Airlines
Tue, Jan 27 - Wed, Feb 18
Alaska Airlines Logo
11:53 am - 11:54 pm
ONT
-
BOS
9h 01m1 stop
Alaska Airlines Logo
4:36 pm - 11:52 pm
BOS
-
ONT
10h 16m1 stop
$258Alaska Airlines
Wed, Apr 29 - Sat, May 9
United Airlines Logo
1:34 pm - 11:53 pm
ONT
-
BOS
7h 19m1 stop
United Airlines Logo
4:25 pm - 10:26 pm
BOS
-
ONT
9h 01m1 stop
$259United Airlines
Tue, Feb 24 - Tue, Mar 3
Southwest Logo
5:45 pm - 8:50 am
ONT
-
BOS
12h 05m2 stops
Southwest Logo
5:30 am - 10:40 am
BOS
-
ONT
8h 10m1 stop
$264Southwest
Mon, Jan 26 - Thu, Jan 29
Delta Logo
10:30 pm - 10:02 am
ONT
-
BOS
8h 32m1 stop
Delta Logo
7:15 am - 1:56 pm
BOS
-
ONT
9h 41m1 stop
$267Delta
Tue, Jan 6 - Tue, Jan 13
American Airlines Logo
12:57 pm - 11:12 pm
ONT
-
BOS
7h 15m1 stop
American Airlines Logo
9:45 am - 6:20 pm
BOS
-
ONT
11h 35m2 stops
$272American Airlines
Mon, Mar 23 - Thu, Mar 26
Southwest Logo
9:55 pm - 8:00 am
ONT
-
MHT
7h 05m1 stop
Southwest Logo
5:35 am - 2:05 pm
MHT
-
ONT
11h 30m1 stop
$437Southwest
Booking Insights

KAYAK's insights & trends for Ontario to New Hampshire flights

Get data-powered insights and trends into flights from Ontario to New Hampshire to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Ontario to New Hampshire?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to New Hampshire, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Ontario to New Hampshire is September, when tickets cost $376 (return) on average. On the other hand, the most expensive months are November and December, when the average cost of round-trip tickets is $537 and $463 respectively.

What’s the cheapest day of the week to fly from Ontario to New Hampshire?

The average price of all round-trip flights from Ontario to New Hampshire clicked on KAYAK for each day over the last 12 months.

For Ontario to New Hampshire, Tuesday is the cheapest day to fly on average and Sunday is the most expensive. Flying from New Hampshire back to Ontario, the best deals are generally found on Tuesday, with Sunday being the most expensive.

How far in advance should I book a flight from Ontario to New Hampshire?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Ontario to New Hampshire, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Ontario to New Hampshire, you should book around 2 weeks before departure, which saves you about 18% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 6 weeks before departure.

Good to know

Low seasonFebruary
Cheapest flight$99
Best time to beat the crowds but there is an average 6% increase in price.
Most popular time to fly with an average 18% increase in price.
Flight from Ontario to Boston

FAQs - booking New Hampshire flights

  • How does KAYAK find such low prices on flights from Ontario to New Hampshire?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to New Hampshire.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to New Hampshire?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Ontario to New Hampshire is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario to New Hampshire?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Ontario to New Hampshire with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to New Hampshire?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Ontario to New Hampshire up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to New Hampshire?

    The cheapest time of day to fly to New Hampshire is generally in the evening, when round-trip flights cost $405 on average. Morning departures are around 14% more expensive than evening flights, on average. The most expensive time of day to fly to New Hampshire is generally in the morning, which is peak travel time and where the average cost of a ticket is $463.

Reviews of the top airline flying from Ontario to New Hampshire

 
See real verified KAYAK customer reviews for airlines flying from Ontario to New Hampshire. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Ontario to New Hampshire? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
SouthwestOverall score based on 4250 reviews
8.6Crew
8.0Comfort
7.5Entertainment
8.1Boarding
7.0Food
Airline reviews

The boarding and seat assignment system no longer works for me, but I know it is being replaced. Otherwise, I am good with the overall experience.

8.0 ExcellentRussell, Dec 2025
SAN - OAK
Read more Southwest reviews

The boarding and seat assignment system no longer works for me, but I know it is being replaced. Otherwise, I am good with the overall experience.

The lead steward kept singing about "San Francisco" and hotel California---more annoying than humorous....needs work. Flight was smooth and on time.

San Diego airport is brand new, spacious, airy and very smooth checkin at SW baggage drop.

Crew could have been friendlier, maybe I'm spoiled by SW crews. In flight wifi was good. Would be nice to have more food offerings on a 4 plus hour flight

Ever since Southwest starting charging for bags, passengers don't want to pay to check their bags, so the gate agents have to beg people to check their roller bags now because there's "not enough space". This was a terrible business move by Southwest.

Sacrament staff are always polite and helpful. Airport is easy to maneuver and boarding is straightforward.

As always, the entire Southwest experience was wonderful, from online booking to flight to baggage retrieval. Very grateful.

The weather could have been better. There was a 40 minute ATC delay in SFO because of marine fog and a micro cell storm delayed landing and take-off at Nashville. The gate was changed 5 minutes from boarding from gate B3 to gate C23 at Nashville airport.

The cabin was quiet for the redeye flight. The area was clean. The staff was great. The 787 Max was in good condition. Drawbacks were that the seat widths were tight for some passengers. The seat padding was at best average and for a long flight uncomfortable.

Delayed flight. Nicest crew member was a SW pilot flying seated next to me who kindly move to seat the final passenger. Flight extra delayed. My cup of refreshment of ginger ale was so packed with ice it was literally 2 sips.

Everything you need to know for your flight from Ontario to New Hampshire

Information on your arrival and departure airports