$87 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 11/14. 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

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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Flight Deals

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$251
Portland
Portland1 stop$237
Boston
Boston1 stop$251
Portland
Portland1 stop$237

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

Wed, Oct 1 - Wed, Oct 8
Delta Logo
4:10 pm - 12:34 amSTL-PWM
7h 24m1 stop
Delta Logo
6:00 am - 10:26 amPWM-STL
5h 26m1 stop
$237Delta
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Wed, Oct 1 - Wed, Oct 8
Delta Logo
4:10 pm - 12:34 amSTL-PWM
7h 24m1 stop
Delta Logo
5:42 am - 3:55 pmPWM-STL
11h 13m2 stops
$242Delta
Find Deal
Sun, Oct 19 - Thu, Oct 23
 Logo
10:57 am - 11:26 amSTL-BOS
23h 29m1 stop
 Logo
8:24 pm - 10:16 amBOS-STL
14h 52m2 stops
Sun, Oct 19 - Wed, Oct 22
 Logo
10:57 am - 11:26 amSTL-BOS
23h 29m1 stop
 Logo
3:00 pm - 9:22 amBOS-STL
19h 22m2 stops
Tue, Oct 14 - Wed, Nov 5
United Airlines Logo
6:00 am - 1:25 pmSTL-BOS
6h 25m1 stop
United Airlines Logo
9:40 am - 3:49 pmBOS-STL
7h 09m1 stop
$255United Airlines
Find Deal
Sat, Oct 11 - Wed, Oct 15
American Airlines Logo
8:42 am - 6:35 pmSTL-BOS
8h 53m1 stop
American Airlines Logo
4:15 pm - 6:26 pmBOS-STL
3h 11mnonstop
$260American Airlines
Find Deal
Wed, Oct 29 - Wed, Nov 5
American Airlines Logo
6:00 am - 3:04 pmSTL-BOS
8h 04m1 stop
American Airlines Logo
7:45 am - 10:10 amBOS-STL
3h 25mnonstop
$261American Airlines
Find Deal
Tue, Oct 14 - Sat, Oct 18
United Airlines Logo
5:24 pm - 11:13 pmSTL-PWM
4h 49m1 stop
United Airlines Logo
6:00 am - 11:47 amPWM-STL
6h 47m1 stop
$297United Airlines
Find Deal
Mon, Nov 17 - Wed, Nov 26
Southwest Logo
9:45 am - 4:35 pmSTL-MHT
5h 50m1 stop
Southwest Logo
5:55 pm - 11:50 pmMHT-STL
6h 55m1 stop
$307Southwest
Find Deal
Mon, Nov 17 - Wed, Nov 26
Southwest Logo
8:20 am - 7:05 pmSTL-MHT
9h 45m2 stops
Southwest Logo
5:55 pm - 11:50 pmMHT-STL
6h 55m1 stop
$318Southwest
Find Deal
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.

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 $391 (return) on average. On the other hand, the most expensive months are April and June, when the average cost of round-trip tickets is $447 and $442 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 Thursday and avoid Saturdays 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 50% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 8 weeks before departure.

Good to know

Low seasonFebruary
Cheapest flight$87
Best time to beat the crowds with an average 6% drop in price.
Most popular time to fly with an average 1% 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.

  • 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 $431 on average. Morning departures are around 20% 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 $1,056.

Top tips for finding cheap flights to New Hampshire

  • Looking for a cheap flight? 25% of our users found tickets from St. Louis to the following destinations at these prices or less: Boston $230 one-way - $410 round-trip

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 4242 reviews
8.0Comfort
7.5Entertainment
7.0Food
8.6Crew
8.1Boarding
Airline reviews

I wish they had movie screens in the headrests. The seats are much improved, more legroom and recently renovated. Bathroom was clean. Staff was outstanding!!

10.0 ExcellentG, Sep 2025LAS - ATL
Read more Southwest reviews

I wish they had movie screens in the headrests. The seats are much improved, more legroom and recently renovated. Bathroom was clean. Staff was outstanding!!

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.

After being assaulted by a flight attendant I was then brushed off as oh well because he long braids didn’t mean to whip me in the eye. I have filed complaints and will see. But like any other issue I’ve had with kayak involved it’s been trash. Last time I’ll be using your app

AC sub par. WiFi not working correctly. Ac sucked. Seats very narrow.

Near 4 hour flight with only 1 service. Had to use call button to request water. Internet and power not working until into flight. Internet would stop working during flight.

Southwest's seats are the least comfortable I have ever sat in.

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.

Southwest like most American domestic airlines, is a mediocre airline. But it is among the cheapest. Oh well.

My flight was delayed 50 minutes and we were rushed to board to then sit for 15 minutes until the pilot arrived. Unacceptable since we could have waited to board. Also the delayed flight was updated AFTER we boarded to more than the 10 minutes as originally stated.

Given it’s a red-eye into Charolotte, we didn’t get any food. The survey does not include “N/A” so the rating will be skewed.

Great. Quick and quiet and east. The breakfast choices were a welcome surprise!

American airlines suck they delay the flights all the time made me sleep in an airport because my flight was delayed and I miss my connecting flight

There's nothing I liked about it. For first off I scheduled this trip two weeks in advance then they delayed my flight which messed up my whole trip. So I scheduled it for the following weekend thinking there won't be a delay and guess what as soon as I got to the airport we said in the airplane on the tarmac for an hour and a half. Not only was it delayed I missed my connecting flight meaning I had to stay the night at Dallas-Fort Worth airport sleeping on the floor. I will tell you this I will never fly American airlines ever again I have had nothing but horrible experience with them and I just throw money at them

The stewardess hit me with the food kart twice on the head and didn't say I'm sorry once. The same stewardess gave me a warm Apple Juice with No ice. The Flight was delayed for Departure 6 times, starting from 2:36pm, finally taking off 7:50pm. I was late picking up my child from the sitter by 3 hours.

Having to reschedule flights a day later, they loaded by luggage on the wrong plane from Little rock now I have to HOPE they deliver it to where im staying like they said would. International flight crew was very disgruntled and not very friendly.

We will be writing a long, detailed letter to corporate about our awful experience with American airlines.

It took way too long to diagnose and solve the problem of a broken crew member cabin seat. Though compensation for the volunteer who left the flight was very kind.

The entertainment package was vast and the selections were very current. Keep updating it was great.

The seat was so hard my tailbone was aching The crew was kind of a b**** because I made a joke that I didn't care if they close the door I total c*** when she was trying to f****** act like she was mad at me because I said that The flight was bumpy. Sure you didnt have control over that.

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

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