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Cheap flights from St. Louis to New Hampshire from $68

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to New Hampshire departing on 1/31. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from St. Louis to New Hampshire

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
8:22 pm - 1:13 am
STL
-
BOS
27h 51m1 stop
Frontier Logo
6:00 am - 6:51 am
BOS
-
STL
25h 51m1 stop
$134Frontier
Mon, Feb 23 - Tue, Mar 3
Frontier Logo
8:22 pm - 1:13 am
STL
-
BOS
27h 51m1 stop
Frontier Logo
6:00 am - 6:51 am
BOS
-
STL
25h 51m1 stop
$142Frontier
Wed, Jan 21 - Tue, Jan 27
Multiple Airlines Logo
8:22 pm - 1:13 am
STL
-
BOS
27h 51m1 stop
Multiple Airlines Logo
12:43 pm - 10:27 pm
BOS
-
STL
10h 44m1 stop
$143Multiple Airlines
Mon, Feb 23 - Wed, Mar 4
Multiple Airlines Logo
3:49 pm - 1:28 pm
STL
-
BOS
20h 39m1 stop
Multiple Airlines Logo
12:43 pm - 12:27 am
BOS
-
STL
12h 44m1 stop
$154Multiple Airlines
Tue, Feb 24 - Fri, Feb 27
American Airlines Logo
5:59 pm - 11:50 pm
STL
-
MHT
4h 51m1 stop
American Airlines Logo
5:01 pm - 9:51 pm
MHT
-
STL
5h 50m1 stop
$319American Airlines
Wed, Jan 14 - Mon, Jan 19
Southwest Logo
11:35 am - 10:05 pm
STL
-
MHT
9h 30m2 stops
Southwest Logo
5:00 am - 9:35 am
MHT
-
STL
5h 35m1 stop
$347Southwest
Wed, Jan 14 - Mon, Jan 19
Southwest Logo
5:00 am - 12:35 pm
STL
-
MHT
6h 35m1 stop
Southwest Logo
7:30 am - 11:30 am
MHT
-
STL
5h 00m1 stop
$377Southwest
Thu, Apr 16 - Wed, Apr 22
United Airlines Logo
7:45 am - 6:59 pm
STL
-
MHT
10h 14m2 stops
United Airlines Logo
2:33 pm - 11:50 pm
MHT
-
STL
10h 17m2 stops
$387United Airlines
Thu, Apr 16 - Wed, Apr 22
American Airlines Logo
5:00 am - 12:05 pm
STL
-
MHT
6h 05m1 stop
American Airlines Logo
6:00 am - 1:14 pm
MHT
-
STL
8h 14m1 stop
$402American Airlines
Wed, Dec 31 - Sun, Jan 4
United Airlines Logo
8:05 am - 2:39 pm
STL
-
PWM
5h 34m1 stop
United Airlines Logo
4:10 pm - 10:58 pm
PWM
-
STL
7h 48m1 stop
$413United Airlines
Thu, Jan 8 - Mon, Jan 12

Frontier flights from St. Louis to New Hampshire

Our best Frontier deals on St. Louis to New Hampshire flight tickets
Frontier
Feb 23
STL8:22 pmLambert-St Louis
27h 51m
1 stop
BOS1:13 amBoston Logan Intl
Mar 3
BOS6:00 amBoston Logan Intl
25h 51m
1 stop
STL6:51 amLambert-St Louis
$134
Find similar
Frontier
Jan 21
STL8:22 pmLambert-St Louis
27h 51m
1 stop
BOS1:13 amBoston Logan Intl
Jan 27
BOS6:00 amBoston Logan Intl
25h 51m
1 stop
STL6:51 amLambert-St Louis
$142
Find similar
Frontier
Jan 8
STL3:43 pmLambert-St Louis
8h 36m
1 stop
BOS1:19 amBoston Logan Intl
Jan 12
BOS11:41 amBoston Logan Intl
11h 52m
1 stop
STL10:33 pmLambert-St Louis
$182
Find similar

American Airlines flights from St. Louis to New Hampshire

Our best American Airlines deals on St. Louis to New Hampshire flight tickets
American Airlines
Dec 31
STL2:50 pmLambert-St Louis
2h 39m
BOS6:29 pmBoston Logan Intl
Jan 6
BOS12:55 pmBoston Logan Intl
9h 20m
1 stop
STL9:15 pmLambert-St Louis
$288
Find similar
American Airlines
Jan 1
STL5:00 amLambert-St Louis
5h 06m
1 stop
BOS11:06 amBoston Logan Intl
Jan 8
BOS9:51 amBoston Logan Intl
9h 23m
1 stop
STL6:14 pmLambert-St Louis
$307
Find similar
American Airlines
Jan 14
STL5:59 pmLambert-St Louis
4h 51m
1 stop
MHT11:50 pmManchester
Jan 19
MHT5:01 pmManchester
5h 50m
1 stop
STL9:51 pmLambert-St Louis
$319
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to New Hampshire that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated December 18, 2025.
Use the filters below to find and compare flights from St. Louis to New Hampshire that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Mon 2/23

8:22 pm-1:13 am

1 stop27h 51m

Boston Logan Intl

Tue 3/3

6:00 am-6:51 am

1 stop25h 51m

$134

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Wed 1/21

8:22 pm-1:13 am

1 stop27h 51m

Boston Logan Intl

Tue 1/27

6:00 am-6:51 am

1 stop25h 51m

$142

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Mon 2/23

8:22 pm-1:13 am

1 stop27h 51m

Boston Logan Intl

Wed 3/4

12:43 pm-10:27 pm

1 stop10h 44m

$143

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Tue 2/24

3:49 pm-1:28 pm

1 stop20h 39m

Boston Logan Intl

Fri 2/27

12:43 pm-12:27 am

1 stop12h 44m

$154

St. LouisManchester

STL - MHT

STLMHT

Lambert-St Louis

Wed 1/14

5:59 pm-11:50 pm

1 stop4h 51m

Manchester

Mon 1/19

5:01 pm-9:51 pm

1 stop5h 50m

$319

St. LouisManchester

STL - MHT

STLMHT

Lambert-St Louis

Wed 1/14

11:35 am-10:05 pm

2 stops9h 30m

Manchester

Mon 1/19

5:00 am-9:35 am

1 stop5h 35m

$347

St. LouisManchester

STL - MHT

STLMHT

Lambert-St Louis

Thu 4/16

5:00 am-12:35 pm

1 stop6h 35m

Manchester

Wed 4/22

7:30 am-11:30 am

1 stop5h 00m

$377

St. LouisManchester

STL - MHT

STLMHT

Lambert-St Louis

Thu 4/16

7:45 am-6:59 pm

2 stops10h 14m

Manchester

Wed 4/22

2:33 pm-11:50 pm

2 stops10h 17m

$387

St. LouisManchester

STL - MHT

STLMHT

Lambert-St Louis

Wed 12/31

5:00 am-12:05 pm

1 stop6h 05m

Manchester

Sun 1/4

6:00 am-1:14 pm

1 stop8h 14m

$402

St. LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

Thu 1/8

8:05 am-2:39 pm

1 stop5h 34m

Portland

Mon 1/12

4:10 pm-10:58 pm

1 stop7h 48m

$413

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to New Hampshire from

How to get the cheapest flight ticket from St. Louis to New Hampshire

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to New Hampshire?

The month of August is another great option to travel to New Hampshire, with average flight prices from St. Louis averaging around $409.

What is the cheapest day to depart on your flight to New Hampshire?

The cheapest day to depart on your flight to New Hampshire is on a Friday when prices can be found for as low as $546. This is often the case because there is less demand to fly during this day of the week. The most expensive day to fly to New Hampshire is Monday, with ticket prices averaging around $766.

What is the cheapest time of day to depart on your flight to New Hampshire?

According to our data, the cheapest time of day to fly to New Hampshire is in the evening. momondo users have found flights departing from St. Louis to New Hampshire in the evening for as low as $426. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Try not to purchase tickets at noon because they tend to be around $1,036. Of course, these prices can vary depending on the time of year and what airport you fly to.

How far in advance should I book a flight to New Hampshire?

You are more likely to see cheaper flights to New Hampshire from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to New Hampshire for around $433 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to New Hampshire from St. Louis for as low as $354 on momondo.

Can stopping save me money on St. Louis to New Hampshire flights?

You could potentially save up to 49% on your flight if you consider stops on a St. Louis to New Hampshire flight.

Cheap St. Louis to New Hampshire flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to New Hampshire

Fastest flight time

2h 25m

Direct flights

Every day

Airports in New Hampshire

52 airports
The fastest flight from St. Louis to New Hampshire takes 2h 25m
Direct flights go from St. Louis to New Hampshire every day.
There are 52 airports in New Hampshire. From St. Louis there are direct flights to Boston Logan Intl (BOS).
Search flight deals

  • When did momondo last update prices for flights from Lambert-St Louis Airport to New Hampshire?

    Prices for flights from Lambert-St Louis Airport to New Hampshire refresh daily.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to New Hampshire?

  • How old do you have to be to fly from Lambert-St Louis Airport to New Hampshire?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to New Hampshire.

  • What documentation or ID do you need to fly to New Hampshire?

    The travel and health documents you'll need for your trip to New Hampshire may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at New Hampshire. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from St. Louis to New Hampshire

Compare and see reviews for airlines that fly from St. Louis to New Hampshire with momondo
Airline
Rating
Free Cancellation
Price
SouthwestPriceFrom $200Free CancellationRating
7.9
4,250 reviews
Search Southwest flights
American AirlinesPriceFrom $256Free CancellationRating
7.2
11,054 reviews
Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to New Hampshire?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from St. Louis to New Hampshire. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from St. Louis to New Hampshire with flexible booking policies on momondo?

momondo does allow users to show only those flights to New Hampshire from St. Louis which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from St. Louis to New Hampshire?

Once you have performed a search for St. Louis to New Hampshire flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from St. Louis to New Hampshire right now. Can momondo alert me if prices change?

Yes. momondo can track prices for St. Louis to New Hampshire flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

An easier way to manage your New Hampshire trip

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Find better results for your trip to New Hampshire

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