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St. Louis

$212+ Cheap flights from Harrisburg to St. Louis (MDT - STL)

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.
MDT — STL
ago. 19 — ago. 261
mar. 8/19
mar. 8/26
1 adult, Economy
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Cheapflights Tip: The best prices from Harrisburg to Lambert-St Louis are usually found in April or September, booked 29 days in advance, depart on a Thursday or Saturday and return on a Thursday

Cheap flight deals from Harrisburg to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Harrisburg (MDT) to St. Louis (STL). 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 agosto 14, 2025.

Round-trip from

$246
(Booking.com)

One-way from

$212
(Kiwi.com)

Popular in

March

Cheapest in

April

Average price

$323
From Harrisburg to Lambert-St Louis
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One-way flight from Harrisburg to Lambert-St Louis
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Highest demand for flights based on searches. 3% potential increase in price ($10 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Harrisburg to St. Louis

Cheapest flights from Harrisburg to St. Louis
Explore the most affordable flight options available from Harrisburg to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on agosto 14, 2025.

This Booking.com deal was found by Cheapflights users on 8/13. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/311:07 amMDT - STL
2 stops22h 59mFrontier
dom. 10/51:57 pmSTL - MDT
1 stop19h 05mFrontier
Deal found 8/13$246
This American Airlines deal was found by Cheapflights users on 8/11. 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.
mié. 11/1211:42 amMDT - STL
1 stop6h 05mAmerican Airlines
lun. 11/175:06 pmSTL - MDT
1 stop4h 10mAmerican Airlines
Deal found 8/11$249
This Delta deal was found by Cheapflights users on 8/12. 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.
jue. 8/286:00 amMDT - STL
1 stop4h 15mDelta
mar. 9/25:25 pmSTL - MDT
1 stop4h 54mDelta
Deal found 8/12$254
This Delta deal was found by Cheapflights users on 8/11. 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.
mié. 11/126:00 amMDT - STL
2 stops8h 20mDelta
lun. 11/174:00 pmSTL - MDT
1 stop6h 38mDelta
Deal found 8/11$323
This American Airlines deal was found by Cheapflights users on 8/12. 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.
sáb. 8/1610:35 amMDT - STL
1 stop6h 07mAmerican Airlines
lun. 8/183:53 pmSTL - MDT
1 stop6h 04mAmerican Airlines
Deal found 8/12$328
This Delta deal was found by Cheapflights users on 8/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/146:00 amMDT - STL
1 stop7h 31mDelta
lun. 8/186:00 pmSTL - MDT
1 stop3h 59mDelta
Deal found 8/13$339
This United Airlines deal was found by Cheapflights users on 8/12. 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.
mié. 8/276:30 amMDT - STL
1 stop6h 55mUnited Airlines
dom. 8/318:15 amSTL - MDT
1 stop4h 33mUnited Airlines
Deal found 8/12$349
This Frontier deal was found by Cheapflights users on 8/13. 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.
lun. 9/1510:57 amMDT - STL
2 stops23h 09mFrontier
jue. 9/1810:49 amSTL - MDT
2 stops22h 23mFrontier
Deal found 8/13$374
This United Airlines deal was found by Cheapflights users on 8/12. 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.
jue. 8/286:30 amMDT - STL
1 stop6h 55mUnited Airlines
mar. 9/27:04 pmSTL - MDT
2 stops17h 44mUnited Airlines
Deal found 8/12$405

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated agosto 14, 2025.
Use the filters below to find and compare flights from Harrisburg to St. Louis that are best for you.

Fly from

Harrisburg

Fly to

St. Louis

Route

Depart

Return

Price

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

vie. 10/3

11:07 am-9:06 am

2 stops22h 59m

Lambert-St Louis

dom. 10/5

1:57 pm-10:02 am

1 stop19h 05m

$246

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

vie. 10/3

1:01 pm-5:18 pm

1 stop5h 17m

Lambert-St Louis

dom. 10/5

5:27 am-1:10 pm

1 stop6h 43m

$249

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

jue. 9/11

8:34 am-11:57 am

1 stop4h 23m

Lambert-St Louis

lun. 9/15

2:11 pm-10:42 pm

1 stop7h 31m

$249

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

vie. 9/19

4:36 pm-9:06 pm

1 stop5h 30m

Lambert-St Louis

dom. 9/21

6:05 am-11:01 am

1 stop3h 56m

$249

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

vie. 1/30

7:54 pm-11:32 pm

1 stop4h 38m

Lambert-St Louis

vie. 2/6

1:30 pm-8:15 pm

1 stop5h 45m

$249

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

mié. 11/12

11:42 am-4:47 pm

1 stop6h 05m

Lambert-St Louis

lun. 11/17

5:06 pm-10:16 pm

1 stop4h 10m

$249

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

vie. 8/29

6:30 am-12:25 pm

1 stop6h 55m

Lambert-St Louis

mar. 9/2

8:15 am-1:48 pm

1 stop4h 33m

$254

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

jue. 8/28

6:00 am-9:15 am

1 stop4h 15m

Lambert-St Louis

mar. 9/2

5:25 pm-11:19 pm

1 stop4h 54m

$254

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

jue. 8/28

10:50 am-2:33 pm

1 stop4h 43m

Lambert-St Louis

mar. 9/2

8:15 am-1:48 pm

1 stop4h 33m

$254

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

mié. 11/12

6:00 am-1:20 pm

2 stops8h 20m

Lambert-St Louis

lun. 11/17

4:00 pm-11:38 pm

1 stop6h 38m

$323

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/13

Showing 1-10 of 16 results
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Best time to book a flight from Harrisburg to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Harrisburg 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 Harrisburg to St. Louis

How far ahead should I book a flight from Harrisburg to St. Louis?

Use this chart to determine the optimal time to book a round-trip flight from Harrisburg to St. Louis. Price data was last updated on August 8, 2025.

Booking 29 days in advance of your planned departure date is, on average, the best time to get cheap flights from Harrisburg to St. Louis. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, August is the cheapest month in which you can book a flight from Harrisburg to St. Louis (average of $311). Flying from Harrisburg to St. Louis in March is currently the most expensive (average of $356). 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 MDT to STL?

Find hourly flight availability from Harrisburg to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated agosto 14, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 17% on flights from Harrisburg to St. Louis by exploring options for tickets at noon.

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated agosto 14, 2025.
Peruse reviews from past customers who have flown with Delta, United Airlines, and American Airlines from Harrisburg to St. Louis to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,980 reviews

Comfort

7.9

Entertainment

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,980 reviews
Delta
8.0
Very good
7,980 reviews

Comfort

7.9

Entertainment

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,916 reviews
Delta
8.0
Very good
7,980 reviews

Comfort

7.9

Entertainment

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,980 reviews

Comfort

7.9

Entertainment

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

Find useful and relevant information for your journey from Harrisburg to St. Louis. 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 Harrisburg to St. Louis round-trip?

    Delta, at $238, was found to be the cheapest airline from Harrisburg to St. Louis.Alternate airlines to your destination round-trip include American Airlines and United Airlines. Delta is currently priced 28% below the average price you’ll pay for this route.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Harrisburg to St. Louis (average of $311). Flying from Harrisburg to St. Louis in March is currently the most expensive (average of $356). 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
O'Fallon
Fairview Heights
Maryland Heights
Collinsville
Eureka
St. Peters
Glencoe
Alton
Chesterfield
Farmington
Festus

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Top 3 airlines flying from Harrisburg to St. Louis

Discover the top 3 airlines that operate flights from Harrisburg to St. Louis. 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 agosto 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$238Average$323FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$248Average$339FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$258Average$384FlexibilityNo cancel feeOn-time69%

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