$125 Find Cheap Flights from St. Louis 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 St. Louis to New Hampshire departing on 7/9. 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 St. Louis 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 St. Louis to New Hampshire, as well as popular online travel agencies
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Cheap Flights from St. Louis to New Hampshire

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Boston
Boston1 stop$335
Portland
Portland1 stop$319
Boston
Boston1 stop$335
Portland
Portland1 stop$319

Book Cheap St. Louis 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 St. Louis 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 St. Louis to New Hampshire

Tue, Jul 7 - Tue, Jul 14
Delta Logo
3:58 pm - 11:14 pm
STL
-
PWM
6h 16m
1 stop
Delta Logo
6:00 am - 12:17 pm
PWM
-
STL
7h 17m
1 stop
$319Delta
Tue, Jun 2 - Tue, Jun 9
United Airlines Logo
6:00 am - 1:25 pm
STL
-
PWM
6h 25m
1 stop
United Airlines Logo
5:15 am - 12:11 pm
PWM
-
STL
7h 56m
2 stops
$324United Airlines
Wed, Jul 15 - Tue, Jul 21
American Airlines Logo
6:00 am - 12:35 pm
STL
-
PWM
5h 35m
1 stop
American Airlines Logo
6:59 pm - 11:32 pm
PWM
-
STL
5h 33m
1 stop
$326American Airlines
Tue, Jun 9 - Tue, Jun 16
Southwest Logo
5:40 am - 10:50 am
STL
-
MHT
4h 10m
1 stop
Southwest Logo
5:45 am - 11:30 am
MHT
-
STL
6h 45m
1 stop
$327Southwest
Wed, Jun 10 - Tue, Jun 23
American Airlines Logo
6:00 am - 12:39 pm
STL
-
PWM
5h 39m
1 stop
American Airlines Logo
7:28 pm - 12:16 am
PWM
-
STL
5h 48m
1 stop
$332American Airlines
Tue, Jun 9 - Tue, Jun 16
Southwest Logo
3:15 pm - 10:45 pm
STL
-
MHT
6h 30m
2 stops
Southwest Logo
5:45 am - 11:30 am
MHT
-
STL
6h 45m
1 stop
$332Southwest
Wed, Jun 10 - Tue, Jun 23
American Airlines Logo
6:00 am - 12:39 pm
STL
-
PWM
5h 39m
1 stop
American Airlines Logo
7:28 pm - 12:16 am
PWM
-
STL
5h 48m
1 stop
$334American Airlines
Sat, Aug 8 - Thu, Aug 13
Frontier Logo
4:52 pm - 1:23 am
STL
-
BOS
7h 31m
1 stop
Frontier Logo
9:14 am - 5:37 pm
BOS
-
STL
9h 23m
1 stop
$335Frontier
Wed, Jul 8 - Tue, Jul 14
American Airlines Logo
7:51 pm - 11:37 pm
STL
-
BOS
2h 46mnonstop
American Airlines Logo
7:00 am - 9:09 am
BOS
-
STL
3h 09mnonstop
$337American Airlines
Thu, Jun 18 - Sun, Jun 21
Frontier Logo
6:31 pm - 11:05 am
STL
-
BOS
39h 34m
2 stops
Frontier Logo
9:10 am - 8:52 am
BOS
-
STL
24h 42m
1 stop
$338Frontier
Booking Insights

KAYAK's insights & trends for St. Louis to New Hampshire flights

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

How much is a round-trip flight from St. Louis to New Hampshire?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from St. Louis to New Hampshire departing in June.

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

The average price for all round-trip flights from St. Louis to New Hampshire depending on the time of departure, clicked by users on KAYAK in the last 2 weeks.

The cheapest time of day to fly to New Hampshire is generally at night, when round-trip flights cost $459 on average. Morning departures are around 15% more expensive than evening flights, on average. The most expensive time of day to fly to New Hampshire is generally in the afternoon, which is peak travel time and where the average cost of a ticket is $987.

What is the cheapest month to fly from St. Louis to New Hampshire?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis 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 St. Louis to New Hampshire is September, when tickets cost $169 (return) on average. On the other hand, the most expensive months are December and April, when the average cost of round-trip tickets is $486 and $388 respectively.

What’s the cheapest day of the week to fly from St. Louis to New Hampshire?

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

When flying from St. Louis to New Hampshire, you should consider leaving on a Friday and avoid Sundays if you are looking for the best rates. For your return to St. Louis, you’ll find the best rates on Wednesdays and the most expensive ones on Sundays.

How far in advance should I book a flight from St. Louis 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 St. Louis 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 St. Louis to New Hampshire, you should book around 4 weeks before departure, which saves you about 51% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 10 weeks before departure.

Good to know

Low seasonFebruary
Cheapest flight$125
Best time to beat the crowds but there is an average 25% increase in price.
Most popular time to fly with an average 6% increase in price.
Flight from St. Louis to Boston

FAQs - booking New Hampshire flights

  • How does KAYAK find such low prices on flights from St. Louis 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 St. Louis to New Hampshire.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from St. Louis 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 St. Louis 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 St. Louis 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 St. Louis 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 St. Louis 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 airlines flying from St. Louis to New Hampshire

 
See real verified KAYAK customer reviews for airlines flying from St. Louis 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 St. Louis 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 4291 reviews
7.0Food
7.5Entertainment
8.0Comfort
8.6Crew
8.1Boarding
Airline reviews

The checking experience in Orlando was terrible, almost missed the flight. Too many travelers and Southwest completely understaffed.

2.0 MediocreAnonymous, May 2026
MCO - MDW
Read more Southwest reviews

The checking experience in Orlando was terrible, almost missed the flight. Too many travelers and Southwest completely understaffed.

I'm glad it wasn't only 75% full because I could get a good seat

if I was good. Not happy that I have to pay extra money to get the seat I need for lake room, but I guess that’s a sign of the times.

Seats were very comfortable. They tilted back. Drinks and snacks were free and served 3 times. Attendants were awesome.

Plane was clean and comfortable. Flight attendants and gate staff were professional, friendly and efficient. Boarding and deplaning were orderly and efficient. All in all, the typical excellent Southwest experience.

Truly terrible. Will never willingly fly southwest again. Seats are worse than before they switched to assigned seating. One flight attendant was the opposite of helpful (rude, unhelpful, dismissive, and as my stranger seatmate said unprompted: a total prick). This caused me, 15 minutes into the flight, to book an alternate return flight home on a competing airline (first class 1.2k purchase instead of my existing planned flight) just so I would not have to ever be on that aircraft, with that terrible service person, with those horrific seats ever again.

Not having a five hour delay with little notice! The crew was very kind, though, and just as tired as we passengers were. The flight didn't depart until nearly 1 am...and no reason was ever given.

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

no service at all due to turbulence. they should've at least given us snacks, there were only 10 people on the entire flight.

First time I've had to use the disabled accommodations. And I could not have had a better experience with Southwest, i was having trouble getting from one terminal to another due to my heart failure. And the next thing I know a Southwest agent had made sure. I had a wheelchair at all my flights. Can't thank them enough.

The wifi experience is awful. I had to try again and again, taking over 30 minutes, to connect to the wifi. I had to watch the same two ads over and over until I was finally successful. Once connected, it was anything but "high speed" and disconnected at least three times during the flight.

Fine. Nothing to write home about. The plane left on time, and arrived on time.

I was downgraded from first class to coach due to an airplane change. They pulled me out of line and I was the very last person to board the plane stuck in the middle seat with no overhead place to put my carry-.on. Very poor customer service.

Seat comfort was poor (no lumbar or lower back support).

The airplane seats were spacious and comfortable, and the flight attendants were friendly and attentive. The food was delicious like never before. The blankets and toiletries were thoughtfully provided. The captain's navigation was steady and reliable. In short, having flown with Starlux, I won't consider any other airline next time.

STOP MAKING THE SEATING SO CRAMPED. WE NEED A PASSENGER BILL OF RIGHTS!

The passenger in front of of me reclined their seat back all the way the entire flight. Their headrest was in my face the entire flight! I barely had room for the little plastic cup of water to fit on my tray table; can you make the seats and space between the rows any smaller??? You can’t even get up to use the restroom! Worst flight I’ve had in a very long time!

We had several flights and they were all on-time and flawless

My Frequent Flyer nber wasn't put on as I was told it was..... This resulted in a last group boarding and no priority tags on My bags.

Terrible steward... Plane was quite empty... I asked to move "back" in the plane and the steward said no... Unnecessary power trip of mediocre people.

Everything you need to know for your flight from St. Louis to New Hampshire

Information on your arrival and departure airports