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$101+ Cheap flights from St. Louis to Harrisburg (STL - MDT)

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 1/24. Fares are subject to change and may not be available on all flights or dates of travel.
STL — MDT
Feb 14 — Feb 211
Sat 2/14
Sat 2/21
1 adult, Economy
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Cheap flight deals from St. Louis to Harrisburg

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Harrisburg (MDT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 15, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$251
(American Airlines)

One-way from

$101
(Priceline)

Popular in

April

Cheapest in

July

Average price

$369
Provider with most accurate pricing for Lambert-St Louis-Harrisburg flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-Harrisburg flights.
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From Lambert-St Louis to Harrisburg
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One-way flight from Lambert-St Louis to Harrisburg
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($45 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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Find flight deals from St. Louis to Harrisburg

Cheapest flights from St. Louis to Harrisburg
Explore the most affordable flight options available from St. Louis to Harrisburg. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 15, 2026.

This American Airlines deal was found by Cheapflights users on 1/14. 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 3/47:05 am
STL
-
MDT
1 stop7h 30m
American Airlines
Sat 3/77:35 pm
MDT
-
STL
1 stop4h 17m
American Airlines
Deal found 1/14$251
This American Airlines deal was found by Cheapflights users on 1/14. 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.
Thu 1/296:00 am
STL
-
MDT
1 stop3h 54m
American Airlines
Sun 2/15:47 am
MDT
-
STL
1 stop4h 53m
American Airlines
Deal found 1/14$269
This American Airlines deal was found by Cheapflights users on 1/14. 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 3/259:15 am
STL
-
MDT
1 stop5h 58m
American Airlines
Sat 3/2812:30 pm
MDT
-
STL
1 stop6h 30m
American Airlines
Deal found 1/14$270
This United Airlines deal was found by Cheapflights users on 1/13. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/219:55 am
STL
-
MDT
1 stop5h 49m
United Airlines
Wed 2/255:40 pm
MDT
-
STL
1 stop5h 00m
United Airlines
Deal found 1/13$321
This United Airlines deal was found by Cheapflights users on 1/15. 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.
Fri 3/2710:00 am
STL
-
MDT
1 stop5h 44m
United Airlines
Sun 3/295:47 pm
MDT
-
STL
1 stop4h 21m
United Airlines
Deal found 1/15$327
This United Airlines deal was found by Cheapflights users on 1/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/298:05 am
STL
-
MDT
1 stop7h 29m
United Airlines
Mon 2/25:30 pm
MDT
-
STL
1 stop6h 28m
United Airlines
Deal found 1/14$339
This American Airlines deal was found by Cheapflights users on 1/14. 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.
Thu 2/129:37 am
STL
-
MDT
1 stop7h 13m
American Airlines
Mon 2/167:35 pm
MDT
-
STL
1 stop4h 29m
American Airlines
Deal found 1/14$379
This Kiwi.com deal was found by Cheapflights users on 1/14. 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.
Wed 3/48:17 pm
STL
-
MDT
2 stops19h 34m
Frontier
Sat 3/710:18 pm
MDT
-
STL
1 stop8h 39m
Frontier
Deal found 1/14$388
This United Airlines deal was found by Cheapflights users on 1/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/289:55 am
STL
-
MDT
1 stop5h 49m
United Airlines
Sat 3/76:15 am
MDT
-
STL
1 stop5h 21m
United Airlines
Deal found 1/14$413
This Kiwi.com deal was found by Cheapflights users on 1/14. 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.
Thu 2/123:49 pm
STL
-
MDT
1 stop15h 39m
Multiple Airlines
Mon 2/168:49 pm
MDT
-
STL
2 stops35h 02m
Multiple Airlines
Deal found 1/14$434
This United Airlines deal was found by Cheapflights users on 1/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/178:30 am
STL
-
MDT
1 stop4h 21m
United Airlines
Fri 3/206:15 am
MDT
-
STL
1 stop7h 12m
United Airlines
Deal found 1/14$492

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Harrisburg 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 January 15, 2026.
Use the filters below to find and compare flights from St. Louis to Harrisburg that are best for you.

Fly from

St. Louis

Fly to

Harrisburg

Route

Depart

Return

Price

St. LouisHarrisburg

STL - MDT

STLMDT

Lambert-St Louis

Wed 3/4

7:05 am-3:35 pm

1 stop7h 30m

Harrisburg

Sat 3/7

7:35 pm-10:52 pm

1 stop4h 17m

$251

St. LouisHarrisburg

STL - MDT

STLMDT

Lambert-St Louis

Wed 3/25

9:15 am-4:13 pm

1 stop5h 58m

Harrisburg

Sat 3/28

12:30 pm-6:00 pm

1 stop6h 30m

$270

St. LouisHarrisburg

STL - MDT

STLMDT

Lambert-St Louis

Sat 2/21

9:55 am-4:44 pm

1 stop5h 49m

Harrisburg

Wed 2/25

5:40 pm-9:40 pm

1 stop5h 00m

$321

St. LouisHarrisburg

STL - MDT

STLMDT

Lambert-St Louis

Fri 3/27

10:00 am-4:44 pm

1 stop5h 44m

Harrisburg

Sun 3/29

5:47 pm-9:08 pm

1 stop4h 21m

$327

St. LouisHarrisburg

STL - MDT

STLMDT

Lambert-St Louis

Thu 2/12

9:37 am-5:50 pm

1 stop7h 13m

Harrisburg

Mon 2/16

7:35 pm-11:04 pm

1 stop4h 29m

$379

St. LouisHarrisburg

STL - MDT

STLMDT

Lambert-St Louis

Sat 2/28

9:55 am-4:44 pm

1 stop5h 49m

Harrisburg

Sat 3/7

6:15 am-10:36 am

1 stop5h 21m

$413

St. LouisHarrisburg

STL - MDT

STLMDT

Lambert-St Louis

Thu 2/12

3:49 pm-8:28 am

1 stop15h 39m

Harrisburg

Mon 2/16

8:49 pm-6:51 am

2 stops35h 02m

$434

St. LouisHarrisburg

STL - MDT

STLMDT

Lambert-St Louis

Tue 3/17

8:30 am-1:51 pm

1 stop4h 21m

Harrisburg

Fri 3/20

6:15 am-12:27 pm

1 stop7h 12m

$492

St. LouisHarrisburg

STL - MDT

STLMDT

Lambert-St Louis

Wed 3/25

8:12 pm-9:28 pm

2 stops24h 16m

Harrisburg

Sat 3/28

10:18 pm-6:57 am

1 stop9h 39m

$544

St. LouisHarrisburg

STL - MDT

STLMDT

Lambert-St Louis

Thu 1/29

2:45 pm-9:35 am

2 stops17h 50m

Harrisburg

Sun 2/1

6:30 am-11:02 am

1 stop5h 32m

$558

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/14

Showing 1-10 of 19 results
1
2

Compare providers for flights from St. Louis to Harrisburg

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Harrisburg in January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on St. Louis-Harrisburg flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on St. Louis-Harrisburg flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from St. Louis-Harrisburg flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-Harrisburg flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Harrisburg flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from St. Louis to Harrisburg

Have a flexible travel schedule? Discover the best time to fly to Harrisburg 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 Harrisburg

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

Currently, January is the cheapest month in which you can book a flight from St. Louis to Harrisburg (average of $123). Flying from St. Louis to Harrisburg in November is currently the most expensive (average of $248). 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 Harrisburg?

Reviews of airlines servicing Harrisburg

Get insights into the airlines that provide service to Harrisburg. 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 Harrisburg. Reviews last updated January 15, 2026.
See what other customers who have flown with Delta, United Airlines, and American Airlines from St. Louis to Harrisburg have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,051 reviews

Entertainment

7.8

Food

7.2

Comfort

7.9

Boarding

8.1

Overall

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,051 reviews
Delta
7.9
Good
8,051 reviews

Entertainment

7.8

Food

7.2

Comfort

7.9

Boarding

8.1

Overall

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,164 reviews
Delta
7.9
Good
8,051 reviews

Entertainment

7.8

Food

7.2

Comfort

7.9

Boarding

8.1

Overall

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
American Airlines
7.2
Good
11,136 reviews
Delta
7.9
Good
8,051 reviews

Entertainment

7.8

Food

7.2

Comfort

7.9

Boarding

8.1

Overall

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

Related info for your journey

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

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

    There are many flights that can get you from St. Louis to Harrisburg in 5h 49m. Fly via American Airlines or United Airlines to get the fastest option. The distance between St. Louis and Harrisburg is about 731 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying from St. Louis to Harrisburg round-trip?

    Flying on Delta is currently your cheapest option to Harrisburg, with prices starting at $172. Additional round-trip tickets that might be worth considering are offered by American Airlines and United Airlines, with the lowest prices starting at $248 and $248, respectively. Delta is priced at 50% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from St. Louis to Harrisburg one-way?

    For one-way options, check prices for American Airlines. According to our data, you can fly for as low as $236. Users have also found prices from $236 and $250 on United Airlines and Delta, respectively.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from St. Louis to Harrisburg 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 Harrisburg?

    Currently, January is the cheapest month in which you can book a flight from St. Louis to Harrisburg (average of $123). Flying from St. Louis to Harrisburg in November is currently the most expensive (average of $248). 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

Traveling to a place near Harrisburg?

Book flights to Harrisburg if you plan to visit one of these locations
Mechanicsburg
Hershey
Carlisle
Camp Hill

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Alternative routes for St. Louis to Harrisburg

See prices for flight routes from nearby airports that may be better suited for you.
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Top 3 airlines flying from St. Louis to Harrisburg

Discover the top 3 airlines that operate flights from St. Louis to Harrisburg. 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 January 15, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$172Average$323FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$248Average$349FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$248Average$335FlexibilityNo cancel feeOn-time71%

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