$132 Find Cheap Flights from Ontario to New Hampshire - Compare and Save

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 8/31. 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$247
Portland
Portland1 stop$265
Boston
Boston1 stop$247
Portland
Portland1 stop$265

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, Aug 10 - Wed, Aug 19
JetBlue Logo
11:59 pm - 11:25 am
ONT
-
BOS
8h 26m
1 stop
JetBlue Logo
4:30 pm - 10:37 pm
BOS
-
ONT
9h 07m
1 stop
$247JetBlue
Mon, Aug 10 - Tue, Aug 18
JetBlue Logo
11:59 pm - 2:43 pm
ONT
-
BOS
11h 44m
1 stop
JetBlue Logo
2:45 pm - 10:37 pm
BOS
-
ONT
10h 52m
1 stop
$253JetBlue
Mon, Aug 10 - Tue, Aug 18
JetBlue Logo
11:59 pm - 2:43 pm
ONT
-
BOS
11h 44m
1 stop
JetBlue Logo
2:45 pm - 10:37 pm
BOS
-
ONT
10h 52m
1 stop
$254JetBlue
Mon, Aug 10 - Wed, Aug 19
American Airlines Logo
12:59 pm - 11:24 pm
ONT
-
BOS
7h 25m
1 stop
American Airlines Logo
6:45 am - 11:43 am
BOS
-
ONT
7h 58m
1 stop
$295American Airlines
Tue, Aug 11 - Wed, Aug 19
United Airlines Logo
7:00 am - 11:32 pm
ONT
-
PWM
13h 32m
2 stops
United Airlines Logo
5:03 pm - 10:35 pm
PWM
-
ONT
8h 32m
1 stop
$302United Airlines
Sat, Aug 15 - Sat, Aug 22
American Airlines Logo
7:05 am - 10:48 pm
ONT
-
PWM
12h 43m
2 stops
American Airlines Logo
7:28 am - 6:15 pm
PWM
-
ONT
13h 47m
2 stops
$307American Airlines
Wed, Sep 23 - Wed, Sep 30
Southwest Logo
11:55 pm - 12:10 pm
ONT
-
MHT
9h 15m
1 stop
Southwest Logo
3:05 pm - 10:00 pm
MHT
-
ONT
9h 55m
2 stops
$350Southwest
Tue, Sep 22 - Sat, Oct 3
Delta Logo
12:17 pm - 11:30 pm
ONT
-
PWM
8h 13m
1 stop
Delta Logo
6:00 am - 11:07 am
PWM
-
ONT
8h 07m
1 stop
$351Delta
Wed, Sep 23 - Wed, Sep 30
Southwest Logo
7:45 am - 9:10 pm
ONT
-
MHT
10h 25m
2 stops
Southwest Logo
3:05 pm - 10:00 pm
MHT
-
ONT
9h 55m
2 stops
$355Southwest
Sun, Sep 20 - Sat, Oct 3
Delta Logo
10:00 pm - 3:39 pm
ONT
-
PWM
14h 39m
2 stops
Delta Logo
6:00 am - 11:07 am
PWM
-
ONT
8h 07m
1 stop
$356Delta
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.

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 26% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 10 weeks before departure.

Find deals

Good to know

Low seasonJanuary
Cheapest flight$132
Best time to beat the crowds with an average 21% drop in price.
Most popular time to fly and prices are also 6% lower on average.
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.
7.9
SouthwestOverall score based on 4247 reviews
8.0Comfort
7.5Entertainment
8.1Boarding
8.6Crew
7.0Food
Airline reviews

Flight was delayed, full flight and I had to change gates. Southwest flights are always late later in the day.

4.0 OkaySteven, Jun 2026
ONT - LAS
Read more Southwest reviews

Flight was delayed, full flight and I had to change gates. Southwest flights are always late later in the day.

Was fine, delayed and feels like southwest is always late

The entire experience from boarding to landing was amazing! The crew were very friendly. Will definitely be back.

Delayed flight, lack of information, boarding process is a mess as is the carryon luggage causing issues when leaving the plane….just a poor experience.

Comfortable. Easy. No problems. Just wish they had gf options for snacks.

The crew was very kind and made going to Hawaii relaxing and fun to look forward to! Thank you Southwest for a pleasant flight!

Terrible. Even though there’s assigned seating now, they are still the slowest boarding airline of anyone.

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.

I liked receiving attention from aged and well experienced flight attendants. I disliked the non-gluten-free snack but I brought my own so I was OK.

Really full flight, checked in ASAP and still mid Cs.

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

Information on your arrival and departure airports

Ontario (ONT)