$119 Find Cheap Flights from St. Louis 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 St. Louis to New Hampshire departing on 10/22. 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.
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1 adult, Economy, 0 bags

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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
Bostonnonstop$317
Portland
Portland1 stop$324
Boston
Bostonnonstop$317
Portland
Portland1 stop$324

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

Fri, Oct 30 - Sun, Nov 1
Frontier Logo
10:35 am - 11:40 am
STL
-
BOS
24h 05m
1 stop
Frontier Logo
12:35 pm - 9:40 am
BOS
-
STL
22h 05m
1 stop
$316Frontier
Tue, Nov 10 - Tue, Dec 1
American Airlines Logo
9:50 am - 1:26 pm
STL
-
BOS
2h 36mnonstop
American Airlines Logo
7:00 am - 9:26 am
BOS
-
STL
3h 26mnonstop
$317American Airlines
Wed, Aug 19 - Sat, Aug 22
Southwest Logo
1:20 pm - 4:55 pm
STL
-
BOS
2h 35mnonstop
Southwest Logo
5:30 am - 7:20 am
BOS
-
STL
2h 50mnonstop
$317Southwest
Thu, Aug 20 - Mon, Aug 24
Southwest Logo
7:00 am - 10:35 am
STL
-
BOS
2h 35mnonstop
Southwest Logo
5:50 pm - 7:45 pm
BOS
-
STL
2h 55mnonstop
$317Southwest
Mon, Sep 21 - Wed, Sep 30
American Airlines Logo
6:00 pm - 9:47 pm
STL
-
BOS
2h 47mnonstop
American Airlines Logo
6:20 am - 8:20 am
BOS
-
STL
3h 00mnonstop
$317American Airlines
Thu, Oct 15 - Mon, Oct 19
Frontier Logo
10:35 am - 8:20 am
STL
-
BOS
20h 45m
2 stops
Frontier Logo
9:15 am - 7:39 pm
BOS
-
STL
11h 24m
1 stop
$317Frontier
Fri, Oct 9 - Sun, Oct 11
Multiple Airlines Logo
10:35 am - 9:29 am
STL
-
BOS
21h 54m
2 stops
Multiple Airlines Logo
9:15 am - 7:39 pm
BOS
-
STL
11h 24m
1 stop
$324Multiple Airlines
Fri, Oct 9 - Fri, Oct 16
Multiple Airlines Logo
10:35 am - 9:29 am
STL
-
BOS
21h 54m
2 stops
Multiple Airlines Logo
9:15 am - 7:39 pm
BOS
-
STL
11h 24m
1 stop
$324Multiple Airlines
Sat, Aug 22 - Tue, Aug 25
Delta Logo
6:09 pm - 11:59 pm
STL
-
BOS
4h 50m
1 stop
Delta Logo
1:10 pm - 5:38 pm
BOS
-
STL
5h 28m
1 stop
$327Delta
Sat, Aug 22 - Tue, Aug 25
Delta Logo
6:09 pm - 11:59 pm
STL
-
BOS
4h 50m
1 stop
Delta Logo
1:10 pm - 5:38 pm
BOS
-
STL
5h 28m
1 stop
$337Delta
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 August.

Flight prices are typical for this route right now.

Flights to New Hampshire from St. Louis usually cost between $240 and $422 in August.
The lowest price found in the past 5 days was $339 on American Airlines (Aug 20-Aug 27).

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 $508 on average. Morning departures are around 6% 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 $944.

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 May, when tickets cost $318 (return) on average. On the other hand, the most expensive months are February and January, when the average cost of round-trip tickets is $1,046 and $681 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 Wednesday 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 40% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 10 weeks before departure.

Good to know

Low season

February

Cheapest flight

$119
Best time to beat the crowds but there is an average 27% increase in price.
Most popular time to fly and prices are also 3% lower on average.
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.

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 $234 one-way - $426 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 4227 reviews
8.6Crew
7.5Entertainment
8.1Boarding
7.0Food
8.0Comfort
Airline reviews

Snacks are always pretzels. Why can't you also offer peanuts ?

6.0 GoodAnonymous, Mar 2026
STL - HOU
Read more Southwest reviews

Snacks are always pretzels. Why can't you also offer peanuts ?

Only downside was the legroom and seat width, which is always a problem unless I spend more for a premium seat.

Very good. Sad to learn Southwest is going start to charge for bags

Exceptional crew! Friendly and professional. Pleasant attitude and treated everyone with respect.

The flight was promptly on schedule and Southwest delivered everything they promised. No excuses for any shortfalls just 100% ownership of their responsibilities and business. The boarding and seating policy is a complete shambles. What started out as a great idea when Southwest first hit the market has been turned into a disaster due to the lack of integrity in many of the people who fly Southwest and take advantage of Southwest generosity at the expense of their fellow passengers.

Crew was excellent - Plane was fine. Media was good, could use more kid shows; Not a fan of the brownie brittle -- snack could be slightly better.

Left on time and arrived early. Brand new plane and no parts missing. Comfortable seats. The actual Captain spoke prior to the flight and reassured everyone about safety. Crew was so nice and fun. Perfect flight!

Everything went smoothly and the plane wasn’t full. It was delayed though. The delay was increased due to a crew change which was frustrating.

Love Southwest! Always a good trip with a happy crew who goes out of their way to be kind and fun.

friendly staff for the most part. they thought we were going to have bad turbulence so no drink service. there wasn't any turbulence. Iwish you had a choice of snacks

My luggage was not sent with us. Not sure if this is Envoy Air responsibility but that was a very BAD experience

American delayed the flight for a crew rest period. The delay occurred late in the evening - the earliest i can find is 10:20 pm. With a 6 am flight anyone on the flight would have already have been asleep (unless you are insane, a vampire or on drugs) and at least for me i was already on the way to the airport at 445 am the next morning when i discovered they delayed the flight until 9 am. Given the incoming flight was in the air at 6 pm the evening before this should have been figured out a lot more timely that was there only crew to use. Just frustrating given there is no consideration for customer experience anymore in flying.

Good crew and flight was on time. It’s a small plane with limited overhead luggage space. They said the overhead space was full and I had to check my bag. There was still space when I got on. Waiting for my checked luggage added 30 minutes to my trip. Not the end of the world but also not great.

Trip delayed for 2 hours because of rain. We boarded and have to get down the flight and reboard again.

No enough space plus only allowing one laggage instead of two like other airlines.

Qatar airways ,boarding arrangements at Hamid international airport could been better

Two flight changes before the scheduled flight. On the day of the flight, the flight was delayed, which caused the connecting flight to be missed. Then, I was directed to another airport (CUN) and traveled to Tulum. American gave a $12 voucher for lunch. The least expensive item on the menu at a Mexican restaurant was $9.99. Driving to Tulum was a bad auto crash, and traffic was delayed two-plus hours. The bottom line is that we should have been at the hotel at noon, but it ended up at 11:30 PM.

Miami lounges were overcrowded and we were unable to get in. We only had a short time. But the banks are too tight in all American hubs

Overall boarding and debarking is a joke. I dont even bring luggage anymore on trips because you can never allow them to be place then in the overhead bin or you have to pay or you check them which is even worse having to wait for your luggage on the tarmac.

First time flying internationally with AA and probably my last. Not military friendly at all. Didn't allow free checked bag for military family members (dependents) on orders like other airlines. We were charged $100 for baggage weight overage (5 lbs!)even though we had military orders allowing us extra.. Didn’t allow military members to board early. Inefficient and long wait time to board. Seats are smaller and more uncomfortable than other airlines.. no drink service for over 7 hrs of flight! After initial meal was served, the crew never offered a snack or drinks until the breakfast's was served 1 1/2 hrs before landing. Overall expensive and poor experience for the entire flight.

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

Information on your arrival and departure airports