$83 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 7/20. 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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Flights Deals

Best New Hampshire Flight Deals from St. Louis

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Boston
Boston1 stop$172
Portland
Portland1 stop$271
Boston
Boston1 stop$172
Portland
Portland1 stop$271

Cheap Flights from St. Louis to New Hampshire

 
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

Mon, Jul 7 - Thu, Jul 10
Spirit Airlines Logo
7:13 pm - 8:39 amSTL-BOS
12h 26m1 stop
Spirit Airlines Logo
12:26 pm - 9:52 amBOS-STL
22h 26m1 stop
$172Spirit Airlines
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Thu, Sep 11 - Sun, Sep 14
Spirit Airlines Logo
8:44 am - 11:40 pmSTL-BOS
13h 56m1 stop
Spirit Airlines Logo
1:55 pm - 7:49 amBOS-STL
18h 54m1 stop
$176Spirit Airlines
Find Deal
Mon, Jul 7 - Mon, Jul 14
 Logo
7:13 pm - 4:41 pmSTL-BOS
20h 28m2 stops
 Logo
9:32 am - 6:41 pmBOS-STL
10h 09m2 stops
Thu, Jul 10 - Mon, Aug 11
 Logo
10:47 am - 11:31 amSTL-BOS
23h 44m1 stop
 Logo
9:32 am - 6:41 pmBOS-STL
10h 09m2 stops
Thu, Aug 28 - Sun, Aug 31
American Airlines Logo
6:00 am - 11:57 amSTL-MHT
4h 57m1 stop
American Airlines Logo
7:04 am - 12:53 pmMHT-STL
6h 49m1 stop
$267American Airlines
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Thu, Jul 3 - Fri, Aug 1
Frontier Logo
8:44 pm - 11:01 amSTL-BOS
13h 17m1 stop
Frontier Logo
9:40 am - 11:47 pmBOS-STL
15h 07m1 stop
$270Frontier
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Fri, Aug 8 - Sat, Aug 16
Frontier Logo
5:40 pm - 6:13 pmSTL-PWM
23h 33m1 stop
Frontier Logo
6:58 pm - 11:47 pmPWM-STL
29h 49m1 stop
$271Frontier
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Thu, Oct 2 - Mon, Oct 6
Southwest Logo
7:45 am - 8:50 pmSTL-MHT
12h 05m2 stops
Southwest Logo
3:45 pm - 10:25 pmMHT-STL
7h 40m1 stop
$278Southwest
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Wed, Sep 10 - Wed, Sep 17
American Airlines Logo
5:49 am - 12:31 pmSTL-PWM
5h 42m1 stop
American Airlines Logo
12:26 pm - 4:15 pmPWM-STL
4h 49m1 stop
$285American Airlines
Find Deal
Wed, Jul 9 - Wed, Jul 16
Southwest Logo
2:50 pm - 6:25 pmSTL-BOS
2h 35mnonstop
Southwest Logo
7:00 pm - 9:05 pmBOS-STL
3h 05mnonstop
$315Southwest
Find Deal
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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 $380 (return) on average. On the other hand, the most expensive months are July and May, when the average cost of round-trip tickets is $442 and $441 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. For the absolute cheapest price, our data suggests you should book 11 weeks before departure.


Good to know

Low seasonFebruary
High seasonOctober
Cheapest flight$83
Best time to beat the crowds with an average 3% drop in price.
Most popular time to fly and prices are also 0% 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.

  • 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 $421 on average. Morning departures are around 19% 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 $1,073.

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 4287 reviews
8.2Boarding
8.0Comfort
7.1Food
7.6Entertainment
8.6Crew
Airline reviews

Southwest is typically delayed, and it gets wearisome. It is no longer a discount airline and you get way less than you pay for when it comes to comfort and Ce.

6.0 GoodDavid, Jun 2025BWI - COS
Read more Southwest reviews

Southwest is typically delayed, and it gets wearisome. It is no longer a discount airline and you get way less than you pay for when it comes to comfort and Ce.

We sat on the plane on the tarmac for 4 hours.

I'm not a fan of Southwest's model. I don't like the herding style of boarding.

Flight crew and cabin crew were great. I had to rearrange flights because my original flight was 3hrs delayed for weather, the rub is the flight I moved to boarded on time then we sat at the gate for 2 hours because scheduling stole our first officer for another flight, TWICE. Then our actual FO was an hour delayed. To make it worse my original flight went from a 3 hour delay to departing 15min EARLY. Just poor scheduling operations all around.

Bring back peanuts Take our drink orders when were all seated, especially after you switch to assigned seating.

Staff was far less than helpful at all times. Departure and arrival times mean nothing to Southwest. Extremely disappointed, will never fly with them again, and I’ll be sure to share my experience with all.

It is southwest seat was ok. Not the most comfortable seat

I’ve always loved Southwest. No issues at all. I was flying standby and the gate agent was extremely friendly and helpful. Boarding was smooth and I was able to get a window seat in the emergency exit row. Crew was fantastic! They were very professional and accommodating. We had to divert from our destination due to weather but the flight crew kept everyone at ease and informed us of all pertinent information. Excellent flight

The price of the tickets isn't matching the flight experience. No matter how long the flight is, you're only getting pretzels. The flight attendants looked unkept and over it.

Plz don't take away free bags and free seating

It was one of my worst flight ever. First they were changing the gate for at least 4 times, changing from gate D7 to D12 to D44. Considering the size of the Miami Airport, we are talking about long distance and the train at the airport was not working. Then the flight was delayed around one hour. Then finally we boarded into the plane and when everybody was seated, there was an announcement that there is an issue with one of the tire of the plane, so we all had to get out of the plane with our belongings, to replace the tire. So we had around 2.5-hour delay

Most miserable flight ever. We waited almost 2 hours on the runway because the flight was oversold. American offered $1200 credit. Then there was some nonsense about weight distribution. Ridiculous. No food for 8 plus hours on the flight. I will be writing a letter.

Honestly, I haven’t flown American in years, probably due to the pandemic and my being unable to travel for certain periods in the last two years, but it was a good experience to dig out or obtain a new American Airlines account after many years of traveling for business with American in the past.

The plane was probably full boarding was easy. We were able to check our carry-on luggage for free. It was a return flight through Philly to LA. Never saw a stewardess do a demonstration of emergency Procedures. I think my flight was pretty full

Plane, flight, crew, captain were all great. The first flight had a Chipotle box lunch...delicious.

Plane, flight, crew, captain were all great. The first flight had a Chipotle box lunch...delicious. this return flight not as tasty, but filling.

The flight was 2 hour delayed, otherwise everything was excellent. The delay was due to the hourly limit requirement so given that as a reason, I'm happy with the flight!

Weather delay for 2.5 hours followed by half hour crew delay, did not have ginger ale, uncomfortable seats

So awful Unreliable Unfriendly Bad Mad Mean Smelly Hot Late Overbooked Understaffed Expensive Cramped Narcs If they were a fruit they’d be rotten durian

It’s a great flight. Service is good. Staff is awesome.

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

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