STL to HAR, St. Louis Lambert International Airport to Cheap Flights

Based on HopeGoo data, Frontier Airlines offers one-way fares as low as US$121 on Cheapest nonstop routes (e.g. STL to MDT on Mon, Mar 16), while Delta Air Lines offers Cheapest nonstop round-trips from US$243 departing on Sat, Apr 11 and returning on Sat, Apr 18.

At the moment, several airlines serve connecting flights from St. Louis to Harrisburg, including: Delta Air Lines Selected airlines are based on historical data collected from flight bookings made by users on HopeGoo within the last 90 days.

By analyzing data from all airlines on the HopeGoo flight calendar, it looks like the best time to book a flight from St. Louis to Harrisburg is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

To find best deals on flights from St. Louis to Harrisburg, you can use various tools on HopeGoo: · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Mon, Mar 16, with one-way flights priced at just US$121. · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Frontier Airlines. · Set up price alerts to easily monitor ticket prices without having to check every day. · Check HopeGoo flight deals and promo codes frequently. · Avoid peak season unless you book very early. It seems the peak season for Harrisburg travel is around December. · Get exclusive promo codes for HopeGoo app users.

The cheapest months to fly from St. Louis to Harrisburg is September, when demand for travel is lower.

After crunching the numbers on our March flight calendar, it's currently cheapest to fly from St. Louis to Harrisburg on March 16, 2026 with Frontier Airlines, with prices starting at US$121.

You can land at any one of the following hubs in Harrisburg, with St. Louis Lambert International Airport to Harrisburg International Airport (STL-MDT) is by far the most common option on this route: Harrisburg International Airport (MDT).

The time difference between Harrisburg and St. Louis is 1h.

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