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Cheap flights from St. Louis to New Hampshire from $80

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 12/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from St. Louis to New Hampshire

Cheap round-trip flights

American Airlines Logo
6:00 am - 3:04 pmSTL-BOS
8h 04m1 stop
American Airlines Logo
9:00 am - 6:11 pmBOS-STL
10h 11m1 stop
$260American Airlines
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Tue, Oct 21 - Sat, Oct 25
Frontier Logo
11:32 am - 8:55 amSTL-BOS
20h 23m1 stop
Frontier Logo
9:50 am - 10:16 amBOS-STL
25h 26m1 stop
$267Frontier
Find Deal
Thu, Oct 16 - Thu, Oct 23
Multiple Airlines Logo
10:57 am - 11:59 pmSTL-BOS
12h 02m1 stop
Multiple Airlines Logo
9:18 am - 9:07 amBOS-STL
24h 49m2 stops
$268Multiple Airlines
Find Deal
Thu, Oct 23 - Mon, Oct 27
American Airlines Logo
6:00 am - 3:04 pmSTL-BOS
8h 04m1 stop
American Airlines Logo
6:50 am - 9:04 amBOS-STL
3h 14mnonstop
$274American Airlines
Find Deal
Tue, Oct 21 - Sat, Oct 25
Southwest Logo
2:25 pm - 10:55 pmSTL-MHT
7h 30m2 stops
Southwest Logo
3:35 pm - 10:00 pmMHT-STL
7h 25m1 stop
$314Southwest
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Tue, Oct 21 - Tue, Nov 4
Southwest Logo
6:40 pm - 10:10 pmSTL-BOS
2h 30mnonstop
Southwest Logo
7:20 am - 9:30 amBOS-STL
3h 10mnonstop
$317Southwest
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Wed, Oct 29 - Tue, Nov 11
Delta Logo
6:00 am - 12:22 pmSTL-PWM
5h 22m1 stop
Delta Logo
1:27 pm - 6:43 pmPWM-STL
6h 16m1 stop
$334Delta
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Thu, Nov 6 - Sat, Nov 8
United Airlines Logo
8:00 am - 4:44 pmSTL-PWM
7h 44m2 stops
United Airlines Logo
9:45 am - 3:49 pmPWM-STL
7h 04m1 stop
$336United Airlines
Find Deal
Wed, Oct 22 - Wed, Oct 29
United Airlines Logo
3:23 pm - 9:44 pmSTL-PWM
5h 21m1 stop
United Airlines Logo
6:14 am - 10:49 amPWM-STL
5h 35m1 stop
$337United Airlines
Find Deal
Sat, Oct 18 - Sat, Oct 25
Delta Logo
6:00 am - 12:22 pmSTL-PWM
5h 22m1 stop
Delta Logo
2:38 pm - 8:33 pmPWM-STL
6h 55m2 stops
$339Delta
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Thu, Nov 6 - Sat, Nov 8

Frontier flights from St. Louis to New Hampshire

Our best Frontier deals on St. Louis to New Hampshire flight tickets
Frontier
Oct 16
STL11:32 amLambert-St Louis
20h 23m
1 stop
BOS8:55 amBoston Logan Intl
Oct 23
BOS9:50 amBoston Logan Intl
25h 26m
1 stop
STL10:16 amLambert-St Louis
$267
Find similar
Frontier
Oct 31
STL4:52 pmLambert-St Louis
16h 56m
1 stop
BOS10:48 amBoston Logan Intl
Nov 3
BOS9:23 amBoston Logan Intl
24h 44m
2 stops
STL9:07 amLambert-St Louis
$279
Find similar
Frontier
Oct 28
STL8:40 pmLambert-St Louis
35h 20m
2 stops
BOS9:00 amBoston Logan Intl
Nov 8
BOS11:43 amBoston Logan Intl
23h 29m
1 stop
STL10:12 amLambert-St Louis
$291
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American Airlines flights from St. Louis to New Hampshire

Our best American Airlines deals on St. Louis to New Hampshire flight tickets
American Airlines
Oct 21
STL6:00 amLambert-St Louis
8h 04m
1 stop
BOS3:04 pmBoston Logan Intl
Oct 25
BOS9:00 amBoston Logan Intl
10h 11m
1 stop
STL6:11 pmLambert-St Louis
$260
Find similar
American Airlines
Oct 21
STL6:00 amLambert-St Louis
8h 04m
1 stop
BOS3:04 pmBoston Logan Intl
Oct 25
BOS6:50 amBoston Logan Intl
3h 14m
STL9:04 amLambert-St Louis
$274
Find similar
American Airlines
Oct 18
STL7:16 amLambert-St Louis
8h 33m
1 stop
BOS4:49 pmBoston Logan Intl
Oct 25
BOS9:00 amBoston Logan Intl
10h 11m
1 stop
STL6:11 pmLambert-St Louis
$277
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 September 24, 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

Tue 10/21

6:00 am-3:04 pm

1 stop8h 04m

Boston Logan Intl

Sat 10/25

9:00 am-6:11 pm

1 stop10h 11m

$260

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Thu 10/16

11:32 am-8:55 am

1 stop20h 23m

Boston Logan Intl

Thu 10/23

9:50 am-10:16 am

1 stop25h 26m

$267

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Thu 10/23

10:57 am-11:59 pm

1 stop12h 02m

Boston Logan Intl

Mon 10/27

9:18 am-9:07 am

2 stops24h 49m

$268

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Tue 10/21

6:00 am-3:04 pm

1 stop8h 04m

Boston Logan Intl

Sat 10/25

6:50 am-9:04 am

Nonstop3h 14m

$274

St. LouisManchester

STL - MHT

STLMHT

Lambert-St Louis

Tue 10/21

2:25 pm-10:55 pm

2 stops7h 30m

Manchester

Tue 11/4

3:35 pm-10:00 pm

1 stop7h 25m

$314

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Wed 10/29

6:40 pm-10:10 pm

Nonstop2h 30m

Boston Logan Intl

Tue 11/11

7:20 am-9:30 am

Nonstop3h 10m

$317

St. LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

Thu 11/6

6:00 am-12:22 pm

1 stop5h 22m

Portland

Sat 11/8

1:27 pm-6:43 pm

1 stop6h 16m

$334

St. LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

Wed 10/22

8:00 am-4:44 pm

2 stops7h 44m

Portland

Wed 10/29

9:45 am-3:49 pm

1 stop7h 04m

$336

St. LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

Sat 10/18

3:23 pm-9:44 pm

1 stop5h 21m

Portland

Sat 10/25

6:14 am-10:49 am

1 stop5h 35m

$337

St. LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

Thu 11/6

6:00 am-12:22 pm

1 stop5h 22m

Portland

Sat 11/8

2:38 pm-8:33 pm

2 stops6h 55m

$339

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 Thursday when prices can be found for as low as $537. 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 Saturday, with ticket prices averaging around $856.

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 $424. 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 $1,061. 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 $429 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 $370 on momondo.

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 30m

Direct flights

Every day

Airports in New Hampshire

1 airport
The fastest flight from St. Louis to New Hampshire takes 2h 30m
Direct flights go from St. Louis to New Hampshire every day.
There is 1 airport near New Hampshire: 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
8.0
4,244 reviews
Search Southwest flights
American AirlinesPriceFrom $256Free CancellationRating
7.2
10,000 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.

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