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Cheap flights from Harrisburg to St. Louis from $115

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Harrisburg to St. Louis departing on 3/7. 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 Harrisburg to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
6:00 am - 9:32 am
MDT
-
STL
4h 32m
1 stop
Delta Logo
5:01 pm - 11:27 pm
STL
-
MDT
5h 26m
1 stop
$251Delta
Sat, Feb 28 - Sat, Mar 7
American Airlines Logo
7:35 pm - 11:04 pm
MDT
-
STL
4h 29m
1 stop
American Airlines Logo
10:37 am - 5:50 pm
STL
-
MDT
6h 13m
1 stop
$260American Airlines
Thu, Feb 26 - Wed, Mar 4
Delta Logo
5:55 pm - 11:36 pm
MDT
-
STL
6h 41m
1 stop
Delta Logo
6:00 am - 11:10 am
STL
-
MDT
4h 10m
1 stop
$269Delta
Fri, Feb 13 - Mon, Feb 23
Frontier Logo
10:13 pm - 7:22 am
MDT
-
STL
10h 09m
1 stop
Frontier Logo
8:10 pm - 5:52 pm
STL
-
MDT
20h 42m
1 stop
$283Frontier
Thu, Mar 12 - Mon, Mar 16
Frontier Logo
10:13 pm - 7:22 am
MDT
-
STL
10h 09m
1 stop
Frontier Logo
8:10 pm - 5:52 pm
STL
-
MDT
20h 42m
1 stop
$284Frontier
Thu, Mar 12 - Mon, Mar 16
Multiple Airlines Logo
11:27 am - 10:27 pm
MDT
-
STL
12h 00m
1 stop
Multiple Airlines Logo
8:20 pm - 6:26 pm
STL
-
MDT
21h 06m
2 stops
$290Multiple Airlines
Tue, Feb 10 - Fri, Feb 13
Frontier Logo
10:46 am - 12:27 am
MDT
-
STL
14h 41m
1 stop
Frontier Logo
10:11 pm - 10:32 am
STL
-
MDT
35h 21m
2 stops
$329Frontier
Fri, Feb 20 - Sun, Mar 1
Frontier Logo
10:13 pm - 1:34 pm
MDT
-
STL
16h 21m
2 stops
Frontier Logo
8:10 pm - 5:52 pm
STL
-
MDT
20h 42m
1 stop
$332Frontier
Thu, Mar 12 - Mon, Mar 16
Frontier Logo
10:13 pm - 1:34 pm
MDT
-
STL
16h 21m
2 stops
Frontier Logo
8:10 pm - 5:52 pm
STL
-
MDT
20h 42m
1 stop
$334Frontier
Thu, Mar 12 - Mon, Mar 16
Frontier Logo
10:13 pm - 7:02 am
MDT
-
STL
9h 49m
1 stop
Frontier Logo
4:51 pm - 9:28 pm
STL
-
MDT
27h 37m
1 stop
$340Frontier
Sun, Mar 22 - Wed, Mar 25

Frontier flights from Harrisburg to St. Louis

Our best Frontier deals on Harrisburg to St. Louis flight tickets
Frontier
Jan 31
MDT8:25 pmHarrisburg
12h 59m
1 stop
STL8:24 amLambert-St Louis
Feb 8
STL8:59 amLambert-St Louis
8h 56m
1 stop
MDT6:55 pmHarrisburg
$276
Frontier
Mar 12
MDT10:13 pmHarrisburg
10h 09m
1 stop
STL7:22 amLambert-St Louis
Mar 16
STL8:10 pmLambert-St Louis
20h 42m
1 stop
MDT5:52 pmHarrisburg
$283
Frontier
Mar 12
MDT10:13 pmHarrisburg
10h 09m
1 stop
STL7:22 amLambert-St Louis
Mar 16
STL8:10 pmLambert-St Louis
20h 42m
1 stop
MDT5:52 pmHarrisburg
$284

United Airlines flights from Harrisburg to St. Louis

Our best United Airlines deals on Harrisburg to St. Louis flight tickets
United Airlines
Feb 7
MDT5:26 pmHarrisburg
4h 47m
1 stop
STL9:13 pmLambert-St Louis
Feb 11
STL8:05 amLambert-St Louis
7h 29m
1 stop
MDT4:34 pmHarrisburg
$339
United Airlines
Jan 31
MDT10:48 amHarrisburg
6h 15m
1 stop
STL4:03 pmLambert-St Louis
Feb 4
STL11:20 amLambert-St Louis
4h 14m
1 stop
MDT4:34 pmHarrisburg
$383
United Airlines
Feb 26
MDT6:15 amHarrisburg
17h 44m
2 stops
STL10:59 pmLambert-St Louis
Mar 4
STL9:55 amLambert-St Louis
5h 49m
1 stop
MDT4:44 pmHarrisburg
$385

momondo Fare Finder

 
Customize your flight search to find flights from Harrisburg 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 January 29, 2026.
Use the filters below to find and compare flights from Harrisburg to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

Sat 2/28

6:00 am-9:32 am

1 stop4h 32m

Lambert-St Louis

Sat 3/7

5:01 pm-11:27 pm

1 stop5h 26m

$251

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

Thu 2/26

7:35 pm-11:04 pm

1 stop4h 29m

Lambert-St Louis

Wed 3/4

10:37 am-5:50 pm

1 stop6h 13m

$260

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

Fri 2/13

5:55 pm-11:36 pm

1 stop6h 41m

Lambert-St Louis

Mon 2/23

6:00 am-11:10 am

1 stop4h 10m

$269

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

Thu 3/12

10:13 pm-7:22 am

1 stop10h 09m

Lambert-St Louis

Mon 3/16

8:10 pm-5:52 pm

1 stop20h 42m

$283

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

Thu 3/12

10:13 pm-7:22 am

1 stop10h 09m

Lambert-St Louis

Mon 3/16

8:10 pm-5:52 pm

1 stop20h 42m

$284

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

Tue 2/10

11:27 am-10:27 pm

1 stop12h 00m

Lambert-St Louis

Fri 2/13

8:20 pm-6:26 pm

2 stops21h 06m

$290

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

Fri 2/20

10:46 am-12:27 am

1 stop14h 41m

Lambert-St Louis

Sun 3/1

10:11 pm-10:32 am

2 stops35h 21m

$329

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

Thu 3/12

10:13 pm-1:34 pm

2 stops16h 21m

Lambert-St Louis

Mon 3/16

8:10 pm-5:52 pm

1 stop20h 42m

$332

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

Thu 3/12

10:13 pm-1:34 pm

2 stops16h 21m

Lambert-St Louis

Mon 3/16

8:10 pm-5:52 pm

1 stop20h 42m

$334

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

Sun 3/22

10:13 pm-7:02 am

1 stop9h 49m

Lambert-St Louis

Wed 3/25

4:51 pm-9:28 pm

1 stop27h 37m

$340

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 resultsSorted by cheapest first
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See travel insights to St. Louis from

How to get the cheapest flight ticket from Harrisburg 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, February is the cheapest month to fly from Harrisburg to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $280. The month of April is another great option to travel to St. Louis, with average flight prices from Harrisburg averaging around $283.

How have Harrisburg to St. Louis flight prices changed over time?

When to book flights from Harrisburg to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from Harrisburg to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Harrisburg to St. Louis (MDT to STL) flight deals and tips

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

Fastest flight time

4h 21m

Direct flights

None
The fastest flight from Harrisburg to St. Louis takes 4h 21m
There are no direct flights from Harrisburg to St. Louis. There are no popular flight routes from Harrisburg to St. Louis.
Search flight deals

  • How far is Harrisburg to Lambert-St Louis by plane?

    There are 718.1 mi between Harrisburg and Lambert-St Louis. Typically, this will take 4h 21m by plane in normal conditions.

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

    Prices for flights from Harrisburg Airport to Lambert-St Louis Airport were last updated today.

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

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Harrisburg Airport 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.

  • What is the most popular airline from Harrisburg to St. Louis?

Best airlines flying from Harrisburg to St. Louis

Compare and see reviews for airlines that fly from Harrisburg to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $248Free CancellationRating
7.4
9,215 reviews
Search United Airlines flights
American AirlinesPriceFrom $248Free CancellationRating
7.2
11,205 reviews
Search American Airlines flights
DeltaPriceFrom $248Free CancellationRating
7.9
8,128 reviews
Search Delta 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
Hermann
Fairview Heights
Maryland Heights
Florissant
O'Fallon
Collinsville
Fenton
St. Peters
Wentzville
Alton
Farmington
Clayton
Edwardsville
Eureka
Festus
Glencoe
Litchfield
Shrewsbury

Why use momondo?

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

Finding the right flight to St. Louis from Harrisburg is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to St. Louis quick and easy, saving you time and money.

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

Yes. momondo allows you to filter the results for Harrisburg to St. Louis flights to just show those with flexible booking policies.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Harrisburg to St. Louis.

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

Price alerts on flights to St. Louis from Harrisburg are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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