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$143+ 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 9/28. Fares are subject to change and may not be available on all flights or dates of travel.
STL — MDT
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
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 July 3, 2025.

Round-trip from

$249
(American Airlines)

One-way from

$143
(Mytrip)

Popular in

April

Cheapest in

October

Average price

$310
From Lambert-St Louis to Harrisburg
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One-way flight from Lambert-St Louis to Harrisburg
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Highest demand for flights based on searches. 12% potential increase in price ($50 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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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 July 3, 2025.

This American Airlines deal was found by Cheapflights users on 7/2. 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.
Fri 8/296:00 amSTL - MDT
1 stop4h 38mAmerican Airlines
Mon 9/15:00 amMDT - STL
1 stop4h 20mAmerican Airlines
Deal found 7/2$249
This Delta deal was found by Cheapflights users on 7/2. 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.
Sat 7/126:40 amSTL - MDT
1 stop4h 13mDelta
Sat 7/266:25 pmMDT - STL
1 stop6h 28mDelta
Deal found 7/2$279
This Mytrip deal was found by Cheapflights users on 7/1. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/165:40 pmSTL - MDT
1 stop15h 28mFrontier
Sun 7/2011:06 amMDT - STL
1 stop13h 41mFrontier
Deal found 7/1$305
This Mytrip deal was found by Cheapflights users on 7/3. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/189:50 amSTL - MDT
2 stops9h 11mMultiple Airlines
Tue 7/226:45 pmMDT - STL
3 stops39h 05mMultiple Airlines
Deal found 7/3$420
This United Airlines deal was found by Cheapflights users on 7/2. 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.
Sun 8/175:00 amSTL - MDT
1 stop4h 14mUnited Airlines
Sun 8/246:30 amMDT - STL
1 stop6h 55mUnited Airlines
Deal found 7/2$464

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 July 3, 2025.
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

Fri 8/29

6:00 am-11:38 am

1 stop4h 38m

Harrisburg

Mon 9/1

5:00 am-8:20 am

1 stop4h 20m

$249

St. LouisHarrisburg

STL - MDT

STLMDT

Lambert-St Louis

Sat 7/12

6:40 am-11:53 am

1 stop4h 13m

Harrisburg

Sat 7/26

6:25 pm-11:53 pm

1 stop6h 28m

$279

St. LouisHarrisburg

STL - MDT

STLMDT

Lambert-St Louis

Wed 7/16

5:40 pm-10:08 am

1 stop15h 28m

Harrisburg

Sun 7/20

11:06 am-11:47 pm

1 stop13h 41m

$305

St. LouisHarrisburg

STL - MDT

STLMDT

Lambert-St Louis

Fri 7/18

9:50 am-8:01 pm

2 stops9h 11m

Harrisburg

Tue 7/22

6:45 pm-8:50 am

3 stops39h 05m

$420

St. LouisHarrisburg

STL - MDT

STLMDT

Lambert-St Louis

Sun 8/17

5:00 am-10:14 am

1 stop4h 14m

Harrisburg

Sun 8/24

6:30 am-12:25 pm

1 stop6h 55m

$464

St. LouisHarrisburg

STL - MDT

STLMDT

Lambert-St Louis

Sun 9/28

2:02 pm-10:12 am

1 stop19h 10m

$143

St. LouisHarrisburg

STL - MDT

STLMDT

Lambert-St Louis

Sat 9/27

6:40 am-11:40 am

1 stop4h 00m

$192

St. LouisHarrisburg

STL - MDT

STLMDT

Lambert-St Louis

Sat 9/27

9:20 am-4:52 pm

1 stop6h 32m

$254

St. LouisHarrisburg

STL - MDT

STLMDT

Lambert-St Louis

Sat 9/27

3:35 pm-11:59 pm

2 stops31h 24m

$528

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/1

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 $355). Flying from St. Louis to Harrisburg in November is currently the most expensive (average of $408). 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.

What is the cheapest time of day to fly from STL to MDT?

Find hourly flight availability from St. Louis to Harrisburg. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 3, 2025.

A simple way to save on the total cost of your ticket is to fly from St. Louis to Harrisburg in the morning. If you’re flexible enough to do this you can expect to save up to 19% on your trip compared to booking a flight at noon.

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 July 3, 2025.
See what other customers who have flown with Alaska Airlines, Delta, and United 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.
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Food

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Food

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,982 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Food

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,861 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Food

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Food

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Frontier
5.9
Fair
3,286 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Food

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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.

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

    Flying on American Airlines is currently your cheapest option to Harrisburg, with prices starting at $249. Additional round-trip tickets that might be worth considering are offered by Delta and Frontier, with the lowest prices starting at $279 and $305, respectively. American Airlines is priced at 30% 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 Frontier. According to our data, you can fly for as low as $143. Users have also found prices from $192 and $254 on Delta and United Airlines, 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 $355). Flying from St. Louis to Harrisburg in November is currently the most expensive (average of $408). 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 St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Carlisle
Hershey
Mechanicsburg
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 July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$211Average$343FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$248Average$343FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$248Average$323FlexibilityNo cancel feeOn-time69%

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