$120 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 9/1. 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

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Cheap Flights from Ontario to New Hampshire

Cheapest round-trip prices found by our users on KAYAK in the last 5 days
Boston
Boston1 stop$236
Portland
Portland1 stop$297
Boston
Boston1 stop$236
Portland
Portland1 stop$297

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

Wed, Jan 6 - Tue, Jan 12
United Airlines Logo
6:53 pm - 8:23 amONT  Ontario-BOS Boston Logan Intl
10h 30m1 stop San Francisco
United Airlines Logo
7:30 am - 12:33 pmBOS  Boston Logan Intl-ONT Ontario
8h 03m1 stop Denver Intl
$236United Airlines
Wed, Jan 6 - Wed, Jan 13
Southwest Logo
6:45 am - 4:35 pmONT  Ontario-BOS Boston Logan Intl
6h 50m1 stop Chicago Midway
Southwest Logo
5:05 am - 10:15 amBOS  Boston Logan Intl-ONT Ontario
8h 10m1 stop Denver Intl
$240Southwest
Thu, Oct 29 - Wed, Nov 4
Southwest Logo
12:40 pm - 1:10 amONT  Ontario-BOS Boston Logan Intl
9h 30m1 stop Denver Intl
Southwest Logo
5:00 am - 10:10 amBOS  Boston Logan Intl-ONT Ontario
8h 10m1 stop Denver Intl
$240Southwest
Sat, Oct 17 - Wed, Oct 21
American Airlines Logo
7:00 am - 7:52 pmONT  Ontario-BOS Boston Logan Intl
9h 52m1 stop Dallas/Fort Worth
American Airlines Logo
5:17 am - 1:30 pmBOS  Boston Logan Intl-ONT Ontario
11h 13m1 stop Dallas/Fort Worth
$241American Airlines
Wed, Sep 23 - Wed, Nov 18
American Airlines Logo
10:25 am - 10:29 pmONT  Ontario-BOS Boston Logan Intl
9h 04m1 stop Dallas/Fort Worth
American Airlines Logo
10:00 am - 6:10 pmBOS  Boston Logan Intl-ONT Ontario
11h 10m1 stop Phoenix Sky Harbor Intl
$241American Airlines
Tue, Sep 15 - Sat, Sep 19
United Airlines Logo
9:01 am - 9:02 pmONT  Ontario-BOS Boston Logan Intl
9h 01m1 stop San Francisco
United Airlines Logo
3:49 pm - 9:59 pmBOS  Boston Logan Intl-ONT Ontario
9h 10m1 stop Houston George Bush Intcntl
$241United Airlines
Wed, Sep 9 - Wed, Sep 16
Delta Logo
12:17 pm - 11:29 pmONT  Ontario-PWM Portland
8h 12m1 stop Atlanta Hartsfield-Jackson
Delta Logo
6:00 am - 11:05 amPWM  Portland-ONT Ontario
8h 05m1 stop Atlanta Hartsfield-Jackson
$297Delta
Mon, Sep 14 - Sat, Sep 19
Delta Logo
12:17 pm - 11:28 pmONT  Ontario-PWM Portland
8h 11m1 stop Atlanta Hartsfield-Jackson
Delta Logo
6:00 am - 11:05 amPWM  Portland-ONT Ontario
8h 05m1 stop Atlanta Hartsfield-Jackson
$297Delta
Thu, Nov 12 - Mon, Nov 16
Alaska Airlines Logo
4:09 pm - 5:40 amONT  Ontario-BOS Boston Logan Intl
10h 31m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
7:13 am - 3:13 pmBOS  Boston Logan Intl-ONT Ontario
11h 00m1 stop Seattle/Tacoma Intl
$347Alaska Airlines
Mon, Sep 14 - Tue, Sep 22
Alaska Airlines Logo
6:14 pm - 6:09 amONT  Ontario-BOS Boston Logan Intl
8h 55m1 stop Portland
Alaska Airlines Logo
9:33 am - 5:18 pmBOS  Boston Logan Intl-ONT Ontario
10h 45m1 stop Portland
$347Alaska Airlines
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 36% 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 season

January

Cheapest flight

$120
Best time to beat the crowds with an average 23% drop in price.
Most popular time to fly and prices are also 9% 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.
8.0
SouthwestOverall score based on 4218 reviews
8.6Crew
8.1Boarding
8.0Comfort
7.0Food
7.5Entertainment
Airline reviews

Red eye from San Diego. Temperature of the cabin was way too warm and the air duct flowed very little air.

6.0 GoodGordon, Jul 2026
Read more Southwest reviews

Red eye from San Diego. Temperature of the cabin was way too warm and the air duct flowed very little air.

Overall good, just screaming kids in the area the whole flight.

I think Southwest is the number one airline that anyone can fly I have flown for the first time Frontier and what a joke and their customer service United was a very strange experience I'm only sticking to Southwest from here on out for sure

Great job Southwest! My family doesn't fly often but we felt safe the whole time.

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.

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)