$103 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 4/28. 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$254
Portland
Portland2 stops$328
Boston
Boston1 stop$254
Portland
Portland2 stops$328

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

Mon, Mar 9 - Wed, Mar 11
United Airlines Logo
6:37 pm - 8:13 am
ONT
-
BOS
10h 36m
1 stop
United Airlines Logo
4:30 pm - 10:18 pm
BOS
-
ONT
8h 48m
1 stop
$254United Airlines
Wed, Apr 29 - Thu, Apr 30
Alaska Airlines Logo
10:39 am - 11:59 pm
ONT
-
BOS
10h 20m
1 stop
Alaska Airlines Logo
4:33 pm - 11:59 pm
BOS
-
ONT
10h 26m
1 stop
$259Alaska Airlines
Thu, Mar 5 - Wed, Mar 11
Hawaiian Airlines Logo
4:02 pm - 6:54 am
ONT
-
BOS
11h 52m
1 stop
Hawaiian Airlines Logo
7:00 am - 3:08 pm
BOS
-
ONT
11h 08m
1 stop
$265Hawaiian Airlines
Tue, Mar 10 - Tue, Mar 17
American Airlines Logo
11:58 pm - 12:16 pm
ONT
-
BOS
9h 18m
2 stops
American Airlines Logo
2:40 pm - 10:07 pm
BOS
-
ONT
10h 27m
2 stops
$269American Airlines
Fri, May 1 - Tue, May 5
American Airlines Logo
7:35 pm - 9:27 am
ONT
-
BOS
10h 52m
2 stops
American Airlines Logo
3:16 pm - 10:36 pm
BOS
-
ONT
10h 20m
1 stop
$274American Airlines
Thu, Mar 5 - Wed, Mar 11
Hawaiian Airlines Logo
12:02 pm - 11:59 pm
ONT
-
BOS
8h 57m
1 stop
Hawaiian Airlines Logo
7:00 am - 3:08 pm
BOS
-
ONT
11h 08m
1 stop
$279Hawaiian Airlines
Tue, Apr 28 - Wed, May 6
Delta Logo
7:05 am - 11:24 pm
ONT
-
PWM
13h 19m
2 stops
Delta Logo
5:21 am - 11:36 am
PWM
-
ONT
9h 15m
1 stop
$348Delta
Tue, Apr 28 - Wed, May 6
Delta Logo
7:05 am - 11:24 pm
ONT
-
PWM
13h 19m
2 stops
Delta Logo
5:21 am - 11:36 am
PWM
-
ONT
9h 15m
1 stop
$354Delta
Tue, Jun 23 - Tue, Jun 30
Southwest Logo
11:55 pm - 10:50 am
ONT
-
MHT
7h 55m
1 stop
Southwest Logo
5:45 am - 12:05 pm
MHT
-
ONT
9h 20m
1 stop
$437Southwest
Sat, May 23 - Sun, May 24
Southwest Logo
9:55 pm - 12:25 pm
ONT
-
MHT
11h 30m
1 stop
Southwest Logo
5:30 pm - 10:55 pm
MHT
-
ONT
8h 25m
1 stop
$452Southwest
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 February, when tickets cost $331 (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 $497 respectively.

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 3 weeks before departure, which saves you about 26% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 6 weeks before departure.

Find deals

Good to know

Low seasonJanuary
Cheapest flight$103
Best time to beat the crowds with an average 17% drop in price.
Most popular time to fly with an average 4% 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.

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.
8.0
SouthwestOverall score based on 4283 reviews
8.1Boarding
7.0Food
8.6Crew
8.0Comfort
7.5Entertainment
Airline reviews

The seats are now more narrow. I paid for front row the seats in the front are even more narrow than before.

2.0 MediocreDavid, Feb 2026
SAN - LAS
Read more Southwest reviews

The seats are now more narrow. I paid for front row the seats in the front are even more narrow than before.

The wifi on the plane is great. The only issue that I have is that I prefer an aisle seat and on my trips this week, I was either in the middle or window. If we can work to secure aisle seating, I will be thrilled. Nice trip.

Great flight but super high price. Glad it was a business trip and not personal

3 hour delay. Had to change plans and was still delayed.

The crew canceled the complementary snack and drink in anticipation of turbulence that never materialized. I was counting on the drink (water) to take the the doses of medication - prescribed for my heart condition - that were due during the flight. Since no snack or meal was served on this flight, I cannot rate the food quality. Otherwise, this flight was excellent.

We got exit row seats both flights. Everything was running on time

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

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

Information on your arrival and departure airports

Ontario (ONT)