MDT - STL

$141 Find Cheap Flights from Harrisburg to St. Louis

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Harrisburg to St. Louis departing on 3/8. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to St. Louis

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Harrisburg to St. Louis, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Harrisburg to St. Louis, as well as popular online travel agencies
Travelers love KAYAK
41 299 237 searches in the past 7 days on KAYAK

Save 23% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$160
Typical prices: $249-$354
Frontier
Thu 4/9Mon 4/13
MDT - STL • 1 stop
Cheapest one-way
$141
Frontier
Sun 3/8
MDT - STL • 2 stops
Top airlines
Frontier
Cheapest • from $160 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
April
Cheapest • 19% price drop
May
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to St. Louis!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Harrisburg to St. Louis (MDT-STL)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Harrisburg to St. Louis that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Harrisburg to St. Louis

Thu, Apr 9 - Mon, Apr 13
Frontier Logo
9:11 pm - 7:51 am
MDT
-
STL
11h 40m
1 stop
Frontier Logo
8:41 am - 9:21 pm
STL
-
MDT
11h 40m
1 stop
$160Frontier
Tue, Mar 3 - Mon, Mar 9
Frontier Logo
11:27 am - 6:51 am
MDT
-
STL
20h 24m
2 stops
Frontier Logo
4:51 pm - 5:11 pm
STL
-
MDT
23h 20m
1 stop
$256Frontier
Fri, Feb 27 - Wed, Mar 4
United Airlines Logo
5:40 pm - 9:05 pm
MDT
-
STL
4h 25m
1 stop
United Airlines Logo
9:55 am - 4:44 pm
STL
-
MDT
5h 49m
1 stop
$269United Airlines
Fri, Feb 27 - Wed, Mar 4
Multiple Airlines Logo
10:46 am - 12:27 am
MDT
-
STL
14h 41m
1 stop
Multiple Airlines Logo
8:17 pm - 4:36 pm
STL
-
MDT
43h 19m
2 stops
$279Multiple Airlines
Fri, Feb 27 - Wed, Mar 4
Multiple Airlines Logo
10:46 am - 12:27 am
MDT
-
STL
14h 41m
1 stop
Multiple Airlines Logo
8:17 pm - 4:36 pm
STL
-
MDT
43h 19m
2 stops
$287Multiple Airlines
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
$288Frontier
Mon, Feb 16 - Sun, Feb 22
American Airlines Logo
7:35 pm - 11:04 pm
MDT
-
STL
4h 29m
1 stop
American Airlines Logo
6:00 am - 12:19 pm
STL
-
MDT
5h 19m
1 stop
$289American Airlines
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
$312Frontier
Sat, Feb 14 - Sat, Feb 21
Delta Logo
2:25 pm - 7:56 pm
MDT
-
STL
6h 31m
1 stop
Delta Logo
5:01 pm - 11:27 pm
STL
-
MDT
5h 26m
1 stop
$313Delta
Fri, Feb 13 - Mon, Feb 23
American Airlines Logo
7:35 pm - 10:52 pm
MDT
-
STL
4h 17m
1 stop
American Airlines Logo
2:19 pm - 10:18 pm
STL
-
MDT
6h 59m
1 stop
$319American Airlines
Booking Insights

KAYAK's insights & trends for Harrisburg to St. Louis flights

Get data-powered insights and trends into flights from Harrisburg to St. Louis to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Harrisburg to St. Louis?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Harrisburg to St. Louis departing in April.

What is the cheapest month to fly from Harrisburg to St. Louis?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Harrisburg to St. Louis, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Harrisburg to St. Louis is April, where tickets cost $283 (return) on average. On the other hand, the most expensive months are December and November, where the average cost of round-trip tickets is $448 and $407 respectively.

Good to know

Low seasonJanuary
Cheapest flight$141
Best time to beat the crowds with an average 14% drop in price.
Most popular time to fly and prices are also 6% lower on average.
Flight from Harrisburg to St. Louis

When to book flights from Harrisburg to St. Louis

Are your dates flexible? Find out the best times to travel from Harrisburg to St. Louis based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Harrisburg to St. Louis

  • What is the cheapest flight from Harrisburg to St. Louis?

    In the last 3 days, the lowest price for a flight from Harrisburg to St. Louis was $141 for a one-way ticket and $160 for a round-trip.

  • Do I need a passport to fly between Harrisburg and St. Louis?

    A passport is not required to fly from Harrisburg to St. Louis.

  • Which airports will I be using when flying from Harrisburg to St. Louis?

    On your way to St. Louis, you’ll fly out from Harrisburg. You’ll be landing at Lambert-St Louis.

  • Which aircraft models fly most regularly from Harrisburg to St. Louis?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Harrisburg to St. Louis?

    Star Alliance, SkyTeam, and oneworld are the airline alliances operating flights between Harrisburg and St. Louis, with Star Alliance being the most commonly used for this route.

  • Which is the best airline for flights from Harrisburg to St. Louis, Delta or United Airlines?

    The two airlines most popular with KAYAK users for flights from Harrisburg to St. Louis are Delta and United Airlines. With an average price for the route of $323 and an overall rating of 7.9, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $369 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from Harrisburg to St. Louis?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Harrisburg to St. Louis.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Harrisburg to St. Louis?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Harrisburg is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Harrisburg to St. Louis?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to St. Louis with an airline and back to Harrisburg with another airline. Booking your flights between Harrisburg and STL can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Harrisburg to St. Louis?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to St. Louis from Harrisburg up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 3 airlines serving from Harrisburg to St. Louis

 
See real verified KAYAK customer reviews for airlines flying from Harrisburg to St. Louis. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Harrisburg to St. Louis? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
DeltaOverall score based on 8173 reviews
7.2Food
8.5Crew
7.8Entertainment
8.1Boarding
7.9Comfort
Airline reviews

The flight was great as well as the airline staff

10.0 ExcellentPatty, Feb 2026
TPA - ATL
Read more Delta reviews

The flight was great as well as the airline staff

First class and monitors weren’t working for mine & my husbands. Eventually fixed, but quite annoyed as we bought first class. Also, No foot rests.

Prior to takeoff, the pilot told us there was a possibility of not being able to land and going to Portland. Well that happened, we took off and then did 8 loops around Spokane before the pilot told us we ran out of fuel and had to go to Portland. So for a 35 minute flight we have now been on the plane for 3 hours (boarded at 6:50 am and landed in Portland at 10:30). Then, we just sat in Portland's airport with no updates of when we can start heading back. All of a sudden, our pilots and crew just left, leaving us stranded in a different city and state. We continued to sit in Portland until we finally got a new crew assigned and boarded the plane (This was from 10:30-2). We then sat on the plane for an additional hour before take off because they had to count us multiple times. We finally landed in Spokane at 3:55 PM. So a flight that should have taken at max an hour took us 10 hours and we missed the majority of the recruiting event we went for.

It was delayed but other than that it was great.

Got on the plane and sat there for an hour before departure.

Second flight in a row where the entertainment system is broken. 5 hour long flight with no entertainment and flight attendants did not seem interested in resolving the matter. Very shocked to be treated this poorly considering I paid for a first class experience and have Diamond Medallion status.

They double booked seats, the gate staff changed my ticket as I was boarding she went over to the computer and changed it without telling me. She messed up an entire three row section for me and others. Other travelers were outraged but the gate staff were so rude, so condescending saying it wasn't their problem to solve. I would rate this a zero if I could. Will not fly Delta again I'll stick with United and American.

Comfort seating was on the tight side. Maybe it was a smaller plane(?)

I didn't take this flight. I changed the flight. Why am I getting surveys and notifications on flights that I change. Seems like a defect with Kayak.

Delta One is extraordinary. I fly business when somebody hires me. I just wonder why there is such a chasm between business class and the insanely inhumane and nonsensical coach. The seats are not large enough to fit even my tiny wife. We fly 10% of what we did because we don’t want to pay 5-10 k but for $400 it’s unbearable. It seems like the accountants took over and made stupid decisions. Screw in 20 extra seats and make it so unbearable that people fly 90% less. Just put the damn price up and put some proper chairs in. But business, yay.

The power at the seat didn't work and the seat itself was difficult to adjust - this was a business class seat. Flight attendant gave me miles to compensate. The attendant was very professional and on top of his game the entire flight.

I upgraded my seat and was promised it would be next to the emergency door for extra leg room and they said it was premium plus but it was at the back of the plane...same thing happened from Newark to Dubai

Everything except the food and entertainment. It was a great experience though

Bad food, bad service, cold cabin with no additional blankets when asked for (they told me they don’t provide additional blankets). I’m a frequent traveler and this is one of the worst companies I traveled with (by the way I thought that I booked my ticket with Lufthansa but I didn’t see that the flights were handled by United).

United Airlines is my preferred airlines and I am thankful for Gary who also help support me on the phone to switch my flight literally last min.

Not being stranded in Chicago for her airport to 11:30 tomorrow morning the 3rd

the whole trip was smooth, and as comfortable as flying is these days. flight crew was friendly and very courteous and helpful.

The attendant on board was amazing. She should be doing business/first international long haul.

I was fully checked in the prior night and i was unchecked and then didn’t have a seat when I boarded. Instead of an aisle seat, I was out in the middle seat of the very last row of the plane.

In overall it was a good experience, the only down point was that the entertainment screen was working properly.

They are always late and seats was also not having working charger

Pilot navigated severe weather/snow storm with skill. Described his intentions clearly

This flight captain and crew were amazing, started ahead of time of departure and reached 30 mins before arrival time. Amazing!

Long delays, lack of information about the status of the flight. The flight was delayed 4 times.

Everything about the flight was lovely. My only suggestion would be to offer a few more options of tv series from Apple TV or HBO.

Delays to take off and to leave the plane after landing added a lot of time to this flight.

The Phildalphia to Allentown portion was a BUS, not a plane. All was as expected.

Excellent - explanations were clear staff was nice and flight was comfortable

Flight was delayed not sure why no explanation given and no apologies either. Otherwise the flight was fine

Did not get the seat I selected and paid for.

Everything you need to know for your flight from Harrisburg to St. Louis

Information on your arrival and departure airports