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New Hampshire

$125+ Cheap flights from St. Louis (STL) to New Hampshire

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/5. Fares are subject to change and may not be available on all flights or dates of travel.
STL — MHT
Jun 17 — Jun 241
Wed 6/17
Wed 6/24
1 adult, Economy
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Cheap flight deals from St. Louis to New Hampshire

Cheapest flights from St. Louis to New Hampshire
Explore the most affordable flight options available from St. Louis to New Hampshire. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 18, 2026.

This Delta deal was found by Cheapflights users on 5/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/73:58 pm
STL
-
PWM
1 stop6h 16m
Delta
Tue 7/146:00 am
PWM
-
STL
1 stop7h 17m
Delta
Deal found 5/14$319
This American Airlines deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/156:00 am
STL
-
PWM
1 stop5h 35m
American Airlines
Tue 7/216:59 pm
PWM
-
STL
1 stop5h 33m
American Airlines
Deal found 5/17$326
This American Airlines deal was found by Cheapflights users on 5/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/105:08 am
STL
-
MHT
1 stop5h 25m
American Airlines
Tue 6/166:07 pm
MHT
-
STL
1 stop7h 09m
American Airlines
Deal found 5/13$327
This American Airlines deal was found by Cheapflights users on 5/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/106:00 am
STL
-
PWM
1 stop5h 39m
American Airlines
Tue 6/237:28 pm
PWM
-
STL
1 stop5h 48m
American Airlines
Deal found 5/14$332
This Kiwi.com deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/58:08 pm
STL
-
BOS
2 stops28h 16m
Frontier
Tue 6/99:10 am
BOS
-
STL
1 stop24h 37m
Frontier
Deal found 5/17$335
This Southwest deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/87:10 pm
STL
-
BOS
Nonstop2h 30m
Southwest
Tue 7/146:25 pm
BOS
-
STL
Nonstop3h 05m
Southwest
Deal found 5/17$337
This Kiwi.com deal was found by Cheapflights users on 5/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/186:31 pm
STL
-
BOS
2 stops39h 34m
Frontier
Sun 6/219:10 am
BOS
-
STL
1 stop24h 42m
Frontier
Deal found 5/15$338
This Frontier deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/108:34 pm
STL
-
BOS
1 stop12h 35m
Frontier
Sun 9/1311:05 am
BOS
-
STL
1 stop9h 34m
Frontier
Deal found 5/17$339
This Frontier deal was found by Cheapflights users on 5/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/34:52 pm
STL
-
BOS
1 stop7h 31m
Frontier
Sun 8/96:00 am
BOS
-
STL
1 stop12h 37m
Frontier
Deal found 5/13$340
This United Airlines deal was found by Cheapflights users on 5/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/106:00 am
STL
-
PWM
1 stop6h 25m
United Airlines
Tue 6/235:15 am
PWM
-
STL
2 stops7h 56m
United Airlines
Deal found 5/15$342
This American Airlines deal was found by Cheapflights users on 5/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/46:43 am
STL
-
PWM
1 stop4h 28m
American Airlines
Mon 8/106:46 pm
PWM
-
STL
1 stop5h 37m
American Airlines
Deal found 5/13$343
This Kiwi.com deal was found by Cheapflights users on 5/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/236:31 pm
STL
-
BOS
1 stop12h 21m
Frontier
Sat 6/278:43 am
BOS
-
STL
2 stops49h 09m
Frontier
Deal found 5/14$343

Find flight deals from St. Louis to New Hampshire

Keep the following information in mind while searching for St. Louis to New Hampshire flight deals. Data was last updated May 18, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$319
(Delta)

One-way from

$125
(Frontier)

Popular in

February

Cheapest in

September

Average price

$487
Provider with most accurate pricing for Lambert-St Louis-Boston Logan Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Boston Logan Intl flights.
Search Deals
From Lambert-St Louis to New Hampshire
Search Deals
One-way flight from Lambert-St Louis to New Hampshire
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($63 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated May 18, 2026.
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

Cheapest round-trip

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Wed 7/8

7:10 pm-10:40 pm

Nonstop2h 30m

Boston Logan Intl

Tue 7/14

6:25 pm-8:30 pm

Nonstop3h 05m

$337

St. LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

Sat 8/22

7:05 am-4:02 pm

1 stop7h 57m

Portland

Tue 8/25

6:05 am-11:46 am

1 stop6h 41m

$343

St. LouisManchester

STL - MHT

STLMHT

Lambert-St Louis

Thu 10/1

4:35 pm-12:15 am

1 stop6h 40m

Manchester

Tue 10/6

7:50 am-11:30 am

1 stop4h 40m

$347

St. LouisManchester

STL - MHT

STLMHT

Lambert-St Louis

Fri 7/3

3:35 pm-12:05 am

2 stops7h 30m

Manchester

Tue 7/7

6:15 pm-10:25 pm

1 stop5h 10m

$352
Quickest round-trip

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Fri 6/19

7:55 pm-11:25 pm

Nonstop2h 30m

Boston Logan Intl

Wed 6/24

5:50 am-7:45 am

Nonstop2h 55m

$399

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Wed 6/24

6:55 am-12:10 pm

1 stop4h 15m

Boston Logan Intl

Wed 6/24

5:30 pm-10:25 pm

1 stop5h 55m

$404

St. LouisManchester

STL - MHT

STLMHT

Lambert-St Louis

Mon 6/22

4:35 pm-12:05 am

2 stops6h 30m

Manchester

Tue 7/7

11:25 am-6:25 pm

2 stops8h 00m

$407

St. LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

Tue 8/25

8:00 am-2:34 pm

1 stop5h 34m

Portland

Wed 8/26

7:40 am-12:02 pm

1 stop5h 22m

$409

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Wed 7/29

10:15 am-5:05 pm

1 stop5h 50m

Boston Logan Intl

Sun 8/2

5:50 am-7:45 am

Nonstop2h 55m

$409

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Mon 7/27

4:00 pm-1:00 am

1 stop8h 00m

Boston Logan Intl

Wed 7/29

5:50 am-7:45 am

Nonstop2h 55m

$409

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/13

Showing 1-10 of 58 resultsSorted by cheapest first
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6

Best time to book a flight from St. Louis to New Hampshire

Have a flexible travel schedule? Discover the best time to fly to New Hampshire from St. Louis with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

What is the cheapest month to book a flight from St. Louis to New Hampshire?

Currently, September is the cheapest month in which you can book a flight from St. Louis to New Hampshire (average of $169). Flying from St. Louis to New Hampshire in December is currently the most expensive (average of $486). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost to fly round-trip from St. Louis to New Hampshire?

Reviews of airlines servicing New Hampshire

Get insights into the airlines that provide service to New Hampshire. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to New Hampshire. Reviews last updated May 18, 2026.
Get a feel of what it's like to fly with Southwest and American Airlines from St. Louis to New Hampshire by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
7.9
Good
4,287 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Crew

8.6

Overall

7.9

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Southwest
7.9
Good
4,287 reviews
Southwest
7.9
Good
4,287 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Crew

8.6

Overall

7.9

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
American Airlines
7.1
Good
11,648 reviews
Southwest
7.9
Good
4,287 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Crew

8.6

Overall

7.9

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to New Hampshire. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from St. Louis to New Hampshire?

    For a flight from St. Louis to New Hampshire, you will be flying from Lambert-St Louis. Lambert-St Louis (STL) is just 12.7 mi from the center of the city.

  • How long is the flight from St. Louis to New Hampshire?

    Southwest, Delta, and United Airlines can get you from St. Louis to New Hampshire in just under 2h 30m. Your travel time can differ by up to 5h 27m. St. Louis and New Hampshire are separated by a distance of 1043 mi. This flight may include one or multiple stops.

  • What are the most popular routes from St. Louis to New Hampshire?

    When deciding which route to take from St. Louis to New Hampshire consider Lambert-St Louis - Boston Logan Intl, Lambert-St Louis - Portland or Lambert-St Louis - Manchester as they are the most popular.

  • Can I find deals for flights from St. Louis to New Hampshire that include hotel bookings?

    Yes. In addition to deals on St. Louis to New Hampshire flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to New Hampshire?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to New Hampshire.

  • Can I find deals for business class flights from St. Louis to New Hampshire?

    Yes. Cheapflights offers flight deals from St. Louis to New Hampshire by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from St. Louis to New Hampshire?

    Currently, September is the cheapest month in which you can book a flight from St. Louis to New Hampshire (average of $169). Flying from St. Louis to New Hampshire in December is currently the most expensive (average of $486). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for St. Louis to New Hampshire

See prices for flight routes from nearby airports that may be better suited for you.
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Top 2 airlines flying from St. Louis to New Hampshire

Discover the top 2 airlines that operate flights from St. Louis to New Hampshire. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated May 18, 2026.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$200Average$406FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$214Average$386FlexibilityNo cancel feeOn-time71%

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