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Cheap flights from New Hampshire to St. Louis from $129

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from New Hampshire to St. Louis departing on 10/8. 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 New Hampshire to St. Louis

Cheap round-trip flights

American Airlines Logo
10:30 am - 2:44 pmBOS-STL
5h 14m1 stop
American Airlines Logo
6:10 am - 3:06 pmSTL-BOS
7h 56m1 stop
$252American Airlines
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Tue, Sep 16 - Wed, Sep 17
Logo
3:00 pm - 9:40 amBOS-STL
19h 40m1 stop
Logo
1:57 pm - 1:48 pmSTL-BOS
22h 51m1 stop
$254
Find Deal
Sat, Sep 6 - Mon, Sep 8
Logo
3:00 pm - 9:40 amBOS-STL
19h 40m1 stop
Logo
7:55 pm - 9:58 amSTL-BOS
13h 03m2 stops
$255
Find Deal
Wed, Sep 10 - Sat, Sep 13
Frontier Logo
10:53 am - 9:54 amBOS-STL
48h 01m2 stops
Frontier Logo
4:00 pm - 9:58 amSTL-BOS
16h 58m1 stop
$256Frontier
Find Deal
Fri, Sep 12 - Sun, Sep 21
Southwest Logo
10:05 am - 3:50 pmMHT-STL
6h 45m1 stop
Southwest Logo
1:50 pm - 9:05 pmSTL-MHT
6h 15m1 stop
$257Southwest
Find Deal
Tue, Nov 4 - Tue, Nov 11
American Airlines Logo
7:40 am - 9:45 amBOS-STL
3h 05mnonstop
American Airlines Logo
7:23 am - 5:04 pmSTL-BOS
8h 41m1 stop
$257American Airlines
Find Deal
Sat, Sep 13 - Sat, Sep 27
Frontier Logo
8:38 am - 9:06 amBOS-STL
25h 28m2 stops
Frontier Logo
4:00 pm - 9:58 amSTL-BOS
16h 58m1 stop
$260Frontier
Find Deal
Sat, Sep 6 - Sun, Sep 14
Southwest Logo
5:45 am - 12:35 pmMHT-STL
7h 50m2 stops
Southwest Logo
1:50 pm - 9:05 pmSTL-MHT
6h 15m1 stop
$262Southwest
Find Deal
Tue, Nov 4 - Tue, Nov 11
Delta Logo
6:00 am - 4:05 pmPWM-STL
11h 05m2 stops
Delta Logo
1:26 pm - 12:34 amSTL-PWM
10h 08m2 stops
$287Delta
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Wed, Sep 17 - Wed, Sep 24
Delta Logo
6:00 am - 4:05 pmPWM-STL
11h 05m2 stops
Delta Logo
6:01 am - 12:29 pmSTL-PWM
5h 28m1 stop
$321Delta
Find Deal
Thu, Sep 11 - Sun, Sep 14

American Airlines flights from New Hampshire to St. Louis

Our best American Airlines deals on New Hampshire to St. Louis flight tickets
American Airlines
Sep 16
BOS10:30 amBoston Logan Intl
5h 14m
1 stop
STL2:44 pmLambert-St Louis
Sep 17
STL6:10 amLambert-St Louis
7h 56m
1 stop
BOS3:06 pmBoston Logan Intl
$252
Find similar
American Airlines
Sep 13
BOS7:40 amBoston Logan Intl
3h 05m
STL9:45 amLambert-St Louis
Sep 27
STL7:23 amLambert-St Louis
8h 41m
1 stop
BOS5:04 pmBoston Logan Intl
$257
Find similar
American Airlines
Sep 13
BOS12:52 pmBoston Logan Intl
8h 40m
1 stop
STL8:32 pmLambert-St Louis
Sep 14
STL6:55 pmLambert-St Louis
2h 42m
BOS10:37 pmBoston Logan Intl
$268
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United Airlines flights from New Hampshire to St. Louis

Our best United Airlines deals on New Hampshire to St. Louis flight tickets
United Airlines
Sep 24
PWM6:15 amPortland
9h 04m
2 stops
STL2:19 pmLambert-St Louis
Sep 27
STL3:23 pmLambert-St Louis
5h 21m
1 stop
PWM9:44 pmPortland
$296
Find similar
United Airlines
Sep 16
BOS9:43 amBoston Logan Intl
7h 01m
1 stop
STL3:44 pmLambert-St Louis
Sep 19
STL5:30 pmLambert-St Louis
6h 15m
1 stop
BOS12:45 amBoston Logan Intl
$297
Find similar
United Airlines
Sep 24
PWM6:15 amPortland
9h 04m
2 stops
STL2:19 pmLambert-St Louis
Sep 27
STL3:23 pmLambert-St Louis
7h 36m
2 stops
PWM11:59 pmPortland
$301
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from New Hampshire to St. Louis 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 August 20, 2025.
Use the filters below to find and compare flights from New Hampshire to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Tue 9/16

10:30 am-2:44 pm

1 stop5h 14m

Lambert-St Louis

Wed 9/17

6:10 am-3:06 pm

1 stop7h 56m

$252

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Sat 9/6

3:00 pm-9:40 am

1 stop19h 40m

Lambert-St Louis

Mon 9/8

1:57 pm-1:48 pm

1 stop22h 51m

$254

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Wed 9/10

3:00 pm-9:40 am

1 stop19h 40m

Lambert-St Louis

Sat 9/13

7:55 pm-9:58 am

2 stops13h 03m

$255

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Fri 9/12

10:53 am-9:54 am

2 stops48h 01m

Lambert-St Louis

Sun 9/21

4:00 pm-9:58 am

1 stop16h 58m

$256

ManchesterSt. Louis

MHT - STL

MHTSTL

Manchester

Tue 11/4

10:05 am-3:50 pm

1 stop6h 45m

Lambert-St Louis

Tue 11/11

1:50 pm-9:05 pm

1 stop6h 15m

$257

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Sat 9/13

7:40 am-9:45 am

Nonstop3h 05m

Lambert-St Louis

Sat 9/27

7:23 am-5:04 pm

1 stop8h 41m

$257

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Sat 9/6

8:38 am-9:06 am

2 stops25h 28m

Lambert-St Louis

Sun 9/14

4:00 pm-9:58 am

1 stop16h 58m

$260

ManchesterSt. Louis

MHT - STL

MHTSTL

Manchester

Tue 11/4

5:45 am-12:35 pm

2 stops7h 50m

Lambert-St Louis

Tue 11/11

1:50 pm-9:05 pm

1 stop6h 15m

$262

PortlandSt. Louis

PWM - STL

PWMSTL

Portland

Wed 9/17

6:00 am-4:05 pm

2 stops11h 05m

Lambert-St Louis

Wed 9/24

1:26 pm-12:34 am

2 stops10h 08m

$287

PortlandSt. Louis

PWM - STL

PWMSTL

Portland

Thu 9/11

6:00 am-4:05 pm

2 stops11h 05m

Lambert-St Louis

Sun 9/14

6:01 am-12:29 pm

1 stop5h 28m

$321

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 St. Louis from

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

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 St. Louis?

In general, August is the cheapest month to fly from New Hampshire to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $382. The month of September is another great option to travel to St. Louis, with average flight prices from New Hampshire averaging around $398.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Wednesday when prices can be found for as low as $420. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $504. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from New Hampshire in the evening is the least expensive time of day to depart. momondo users have found prices as low as $429 when looking at flights departing in the evening. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $453 per ticket.

How far in advance should I book a flight to St. Louis?

You are more likely to see cheaper flights to St. Louis from New Hampshire when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $437 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from New Hampshire for as low as $397 on momondo.

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

You could potentially save up to 55% on your flight if you consider stops on a New Hampshire to St. Louis flight.

Cheap New Hampshire to St. Louis flight deals and tips

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

Fastest flight time

2h 50m

Direct flights

Every day

Airports in St. Louis

1 airport
The fastest flight from New Hampshire to St. Louis takes 2h 50m
Direct flights go from New Hampshire to St. Louis every day.
There is 1 airport near St. Louis: Lambert-St Louis (STL)
Search flight deals

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

    Prices for flights from New Hampshire to Lambert-St Louis Airport are refreshed on a daily basis.

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

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from New Hampshire to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The travel and health documents required for your trip to Lambert-St Louis Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Lambert-St Louis Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from New Hampshire to St. Louis

Compare and see reviews for airlines that fly from New Hampshire to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
SouthwestPriceFrom $264Free CancellationRating
8.0
4,246 reviews
Search Southwest flights
American AirlinesPriceFrom $293Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Fairview Heights
Hermann
Maryland Heights
Florissant
O'Fallon
Fenton
Collinsville
Wentzville
Alton
St. Peters
Festus
Farmington
Glencoe
Clayton
Edwardsville
Eureka
Litchfield
Shrewsbury

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from New Hampshire to St. Louis. momondo saves you time and could save you money on your trip.

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

Yes. momondo enables you to select and highlight flights to St. Louis from New Hampshire with this policy.

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

momondo helps you find the best flight between New Hampshire and St. Louis by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

Yes. momondo can track prices for New Hampshire to St. Louis 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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