Cheap Flights from St Louis to Allentown

Compare St Louis to Allentown flight deals

Find the cheapest month or even day of the year to fly to Allentown

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Flight deals from St Louis Airport to Allentown Airport

Looking for a cheap last-minute deal or the best return flight from St Louis Airport to Allentown Airport? If you want to travel next month, return fares start from R 6,819. Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from St Louis to Allentown

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like St Louis to Allentown flights are currently cheapest in June.

St Louis to Allentown: Flight information

The things to know before you go.
Cheapest flight foundR 4,086
Cheapest month to flyJune

Finding cheap flights from St Louis to Allentown: Frequently asked questions

The best price we found for a return flight from St Louis to Allentown is R 6,038. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from St Louis to Allentown. But we found flights with one or more stops from R 6,038.
As of March 2026, there are no flights flying from St Louis to Allentown.
The cheapest month to fly from St Louis to Allentown is usually October.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from St Louis Airport to Allentown Airport on Thursday, 22 October 2026.
No airlines currently offer direct flights between St Louis Airport and Allentown Airport. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Allentown but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Allentown is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Delta offers the cheapest flight tickets to Allentown.

Flying from Lambert-St. Louis International Airport (STL) to Lehigh Valley International Airport (ABE): what you need to know

  • Give yourself plenty of time to make your STL to ABE flight. As a rule of thumb, arrive at least two hours before international departures and an hour ahead for domestic flights.

  • During popular months such as July, it's best to get to the airport well in advance. Arrive two hours before a domestic departure and four hours ahead for an international flight whenever you're flying during peak periods in general.

  • If you want to add a stop to your trip, just deselect 'Direct flights only' when searching for your ticket from Lambert-St. Louis International Airport to Lehigh Valley International Airport. Here are the most popular stopovers between STL and ABE:

    • Hartsfield-Jackson Atlanta International Airport

    • Charlotte Douglas International Airport

    • O'Hare International Airport

How to find the cheapest flights from Lambert-St. Louis International Airport (STL) to Lehigh Valley International Airport (ABE)

  • The lowest price we've seen for a one-way Lambert-St. Louis International Airport to Lehigh Valley International Airport flight is R 4,086. A round-trip fare is currently R 6,038. Depending on the availability and when you book, these fares could change.

  • It's usually smart to book early if you want to find cheap tickets from STL to ABE. That's because airlines adjust prices based on demand, which tends to increase closer to the date of departure.

  • If you can be flexible with your trip dates, use the 'Whole month' search function. It'll show you the lowest price in each month when searching for a flight from Lambert-St. Louis International Airport to Lehigh Valley International Airport.

  • Save time searching for cheap flights from STL to ABE by setting up a Price Alert. We'll send you an email or push notification on the app when a lower fare pops up.

  • Find the right flight for you by using the filters. To see the 'Fastest,' 'Cheapest' or 'Best' flights from Lambert-St. Louis International Airport to Lehigh Valley International Airport, use the 'Sort by' tool. You can also filter by airline, arrival and departure times, and journey duration.

Handy information about Lambert-St. Louis International Airport (STL)

Arriving at Lehigh Valley International Airport (ABE)

Getting from Lehigh Valley International Airport (ABE) to central Allentown

  • The street address for ABE is 3311 Airport Road.

  • Lehigh Valley International Airport is approximately 8 kilometres from central Allentown. Driving there takes about 10 minutes.

  • It takes roughly 30 minutes if you're travelling on public transport.

When to fly to Lehigh Valley International Airport (ABE)

  • The quietest month for a flight from Lambert-St. Louis International Airport to Lehigh Valley International Airport is April, while July is the most popular. Choose the best time to go to Allentown based on whether you prefer a bustling atmosphere or a more laid-back vibe.

  • The warmest month in Allentown is July, with the temperature ranging between 15ºC (59ºF) and 30ºC (86ºF). Book your flights from Lambert-St. Louis International Airport to Lehigh Valley International Airport in this month if this is the kind of weather you like.

  • Search for cheap tickets from STL to ABE in January if you want to travel in cooler conditions. Temperatures are at their lowest then, ranging between -9ºC (16ºF) and 7ºC (45ºF) on average.

Explore more of United States

  • You've seen Allentown, now it's time to discover other corners of United States. Journey about 121 kilometres east to New York to tick off its top attractions. From Statue of Liberty to Central Park and Empire State Building, there's plenty to keep you on the go.

  • Philadelphia is another favourite destination in United States and is around 80 kilometres south of Allentown. No trip is complete without seeing Liberty Bell, Independence Hall and Philadelphia Museum of Art.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.