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Cheap flights from Harrisburg to St. Louis from $100

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 11/7. 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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Cheap round-trip flights

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Delta Logo
6:00 am - 10:43 amMDT-STL
5h 43m1 stop
Delta Logo
6:09 pm - 11:04 pmSTL-MDT
3h 55m1 stop
$249Delta
Find Deal
Wed, Nov 12 - Mon, Nov 17
American Airlines Logo
6:53 am - 1:13 pmMDT-STL
7h 20m2 stops
American Airlines Logo
8:39 am - 3:08 pmSTL-MDT
5h 29m1 stop
$254American Airlines
Find Deal
Tue, Nov 11 - Sat, Nov 15
American Airlines Logo
7:33 pm - 12:05 amMDT-STL
5h 32m1 stop
American Airlines Logo
5:56 pm - 11:53 pmSTL-MDT
4h 57m1 stop
$274American Airlines
Find Deal
Tue, Nov 25 - Tue, Dec 2
United Airlines Logo
6:30 am - 12:27 pmMDT-STL
6h 57m1 stop
United Airlines Logo
6:35 pm - 12:07 amSTL-MDT
4h 32m1 stop
$289United Airlines
Find Deal
Wed, Dec 24 - Fri, Jan 2
Delta Logo
6:25 pm - 11:40 pmMDT-STL
6h 15m1 stop
Delta Logo
5:00 pm - 11:40 pmSTL-MDT
5h 40m1 stop
$293Delta
Find Deal
Wed, Mar 25 - Sat, Mar 28
Delta Logo
7:27 pm - 11:42 pmMDT-STL
5h 15m1 stop
Delta Logo
6:05 pm - 11:07 pmSTL-MDT
4h 02m1 stop
$294Delta
Find Deal
Thu, Dec 4 - Sun, Dec 7
Multiple Airlines Logo
9:30 am - 6:36 pmMDT-STL
10h 06m2 stops
Multiple Airlines Logo
10:40 am - 10:01 amSTL-MDT
22h 21m1 stop
$331Multiple Airlines
Find Deal
Thu, Dec 18 - Mon, Dec 22
United Airlines Logo
6:15 am - 10:43 pmMDT-STL
17h 28m2 stops
United Airlines Logo
6:35 pm - 12:07 amSTL-MDT
4h 32m1 stop
$379United Airlines
Find Deal
Wed, Dec 24 - Fri, Jan 2
American Airlines Logo
8:00 pm - 1:25 amMDT-STL
6h 25m1 stop
American Airlines Logo
6:35 pm - 12:19 amSTL-MDT
4h 44m1 stop
$384American Airlines
Find Deal
Fri, Dec 19 - Sun, Dec 21
Delta Logo
7:12 pm - 11:44 pmMDT-STL
5h 32m1 stop
Delta Logo
5:00 pm - 11:14 pmSTL-MDT
5h 14m1 stop
$394Delta
Find Deal
Fri, Nov 21 - Sat, Nov 22

American Airlines flights from Harrisburg to St. Louis

Our best American Airlines deals on Harrisburg to St. Louis flight tickets
American Airlines
Nov 11
MDT6:53 amHarrisburg
7h 20m
2 stops
STL1:13 pmLambert-St Louis
Nov 15
STL8:39 amLambert-St Louis
5h 29m
1 stop
MDT3:08 pmHarrisburg
$254
Find similar
American Airlines
Nov 25
MDT7:33 pmHarrisburg
5h 32m
1 stop
STL12:05 amLambert-St Louis
Dec 2
STL5:56 pmLambert-St Louis
4h 57m
1 stop
MDT11:53 pmHarrisburg
$274
Find similar
American Airlines
Dec 19
MDT8:00 pmHarrisburg
6h 25m
1 stop
STL1:25 amLambert-St Louis
Dec 21
STL6:35 pmLambert-St Louis
4h 44m
1 stop
MDT12:19 amHarrisburg
$384
Find similar

United Airlines flights from Harrisburg to St. Louis

Our best United Airlines deals on Harrisburg to St. Louis flight tickets
United Airlines
Dec 24
MDT6:30 amHarrisburg
6h 57m
1 stop
STL12:27 pmLambert-St Louis
Jan 2
STL6:35 pmLambert-St Louis
4h 32m
1 stop
MDT12:07 amHarrisburg
$289
Find similar
United Airlines
Dec 24
MDT6:15 amHarrisburg
17h 28m
2 stops
STL10:43 pmLambert-St Louis
Jan 2
STL6:35 pmLambert-St Louis
4h 32m
1 stop
MDT12:07 amHarrisburg
$379
Find similar
United Airlines
Nov 26
MDT6:30 amHarrisburg
6h 58m
1 stop
STL12:28 pmLambert-St Louis
Dec 3
STL5:27 pmLambert-St Louis
15h 03m
3 stops
MDT9:30 amHarrisburg
$453
Find similar

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 October 27, 2025.
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

Wed 11/12

6:00 am-10:43 am

1 stop5h 43m

Lambert-St Louis

Mon 11/17

6:09 pm-11:04 pm

1 stop3h 55m

$249

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

Tue 11/11

6:53 am-1:13 pm

2 stops7h 20m

Lambert-St Louis

Sat 11/15

8:39 am-3:08 pm

1 stop5h 29m

$254

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

Tue 11/25

7:33 pm-12:05 am

1 stop5h 32m

Lambert-St Louis

Tue 12/2

5:56 pm-11:53 pm

1 stop4h 57m

$274

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

Wed 12/24

6:30 am-12:27 pm

1 stop6h 57m

Lambert-St Louis

Fri 1/2

6:35 pm-12:07 am

1 stop4h 32m

$289

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

Wed 3/25

6:25 pm-11:40 pm

1 stop6h 15m

Lambert-St Louis

Sat 3/28

5:00 pm-11:40 pm

1 stop5h 40m

$293

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

Thu 12/4

7:27 pm-11:42 pm

1 stop5h 15m

Lambert-St Louis

Sun 12/7

6:05 pm-11:07 pm

1 stop4h 02m

$294

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

Thu 12/18

9:30 am-6:36 pm

2 stops10h 06m

Lambert-St Louis

Mon 12/22

10:40 am-10:01 am

1 stop22h 21m

$331

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

Wed 12/24

6:15 am-10:43 pm

2 stops17h 28m

Lambert-St Louis

Fri 1/2

6:35 pm-12:07 am

1 stop4h 32m

$379

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

Fri 12/19

8:00 pm-1:25 am

1 stop6h 25m

Lambert-St Louis

Sun 12/21

6:35 pm-12:19 am

1 stop4h 44m

$384

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

Fri 11/21

7:12 pm-11:44 pm

1 stop5h 32m

Lambert-St Louis

Sat 11/22

5:00 pm-11:14 pm

1 stop5h 14m

$394

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 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, April 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 $283. The month of October is another great option to travel to St. Louis, with average flight prices from Harrisburg averaging around $308.

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 Thursday when prices can be found for as low as $318. 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 $762. 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 Harrisburg at noon is the least expensive time of day to depart. momondo users have found prices as low as $325 when looking at flights departing at noon. In the afternoon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $389 per ticket.

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

Direct flights

None
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 29m 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
8,997 reviews
Search United Airlines flights
American AirlinesPriceFrom $248Free CancellationRating
7.2
11,033 reviews
Search American Airlines flights
DeltaPriceFrom $248Free CancellationRating
7.9
7,996 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
Wentzville
Collinsville
Fenton
St. Peters
Alton
Farmington
Festus
Glencoe
Edwardsville
Clayton
Eureka
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.

An easier way to manage your St. Louis trip

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