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

Currently priced at $249, American Airlines will fly you from St. Louis to Allentown and back. In addition to American Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Delta and United Airlines - these airlines can fly you to your destination from $354 and $633, respectively. Users have found that American Airlines is 30% cheaper than the other options available to this destination.

What are the cheapest airlines to fly from St. Louis to Allentown one-way?

The cheapest airline one-way is Delta, with whom users have recently found tickets for as low as $249. However, be on the lookout for offers from American Airlines and United Airlines, as they are both options that can get you from St. Louis to Allentown for a low price.

What is the cheapest day to fly from St. Louis to Allentown?

Travelers seeking maximum savings on their St. Louis to Allentown flight should consider departing on Thursday at noon when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

In terms of precipitation, rainfall in Allentown ranges from 2.7 - 5.0 inches per month. July is typically the wettest month, when rainfall can reach 5.0 in. February is typically the driest time to visit Allentown when rainfall is around 2.7 in.

If weather is an important factor for your trip to Allentown, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 28.4 F).

What are the most popular airlines that fly from St. Louis to Allentown?

Before booking your flight from St. Louis to Allentown check out the most popular airlines for this route: American Airlines, Delta or United Airlines.

What is the cheapest day to fly round-trip from St. Louis to Allentown?

Sunday flights are generally found to be more expensive for flights from St. Louis to Allentown. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Allentown.

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

The best pricing can be found in the month of August. Prices to Allentown from St. Louis average $357. You can even find prices in August for less than $357, as users have found deals to Allentown from as low as $248. The month of February appears to be one of the more expensive times to travel to Allentown from St. Louis. Flying in the targeted month can save you up to 33%.

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

Unlike in the afternoon, when flights are generally more expensive, you can save up to 34% on flights from St. Louis to Allentown by exploring options for tickets at noon.

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

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

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

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

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

Yes. Cheapflights offers flight deals from St. Louis to Allentown by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$249+ Flights from St. Louis to Allentown

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Cheap flight deals from St. Louis to Allentown

Round-trip from	$249 (American Airlines)
One-way from	$249 (Delta)
Popular in	February
Cheapest in	August
Average price	$346

From Lambert-St Louis to Allentown-Bethlehem

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One-way flight from Lambert-St Louis to Allentown-Bethlehem

Search Deals

Highest demand for flights based on searches. 1% potential increase in price ($6 potential increase over avg. RT price).

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Cheapest flight prices on average. 3% potential price decrease ($12 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 Allentown

Cheapest flights from St. Louis to Allentown
Explore the most affordable flight options available from St. Louis to Allentown. Find the lowest fares from popular airlines and budget airlines, with prices last updated on julio 29, 2025.

mié. 8/273:43 pmSTL - ABE

1 stop5h 01mAmerican Airlines

mar. 9/26:32 pmABE - STL

1 stop5h 33mAmerican Airlines

Deal found 7/29

$249

dom. 8/36:00 amSTL - ABE

1 stop5h 15mDelta

dom. 8/106:00 amABE - STL

1 stop4h 41mDelta

Deal found 7/27

$354

vie. 8/152:30 pmSTL - ABE

2 stops7h 23mMultiple Airlines

lun. 8/186:30 amABE - STL

3 stops13h 11mMultiple Airlines

Deal found 7/29

$420

mar. 8/121:20 pmSTL - ABE

1 stop7h 35mUnited Airlines

sáb. 8/165:35 pmABE - STL

1 stop6h 10mUnited Airlines

Deal found 7/28

$633

Best flights from St. Louis to Allentown
Discover carefully curated flight deals from St. Louis to Allentown that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated julio 29, 2025.

mié. 8/273:43 pmSTL - ABE

1 stop5h 01mAmerican Airlines

mar. 9/26:32 pmABE - STL

1 stop5h 33mAmerican Airlines

Deal found 7/29

$249

dom. 8/36:00 amSTL - ABE

1 stop5h 15mDelta

dom. 8/106:00 amABE - STL

1 stop4h 41mDelta

Deal found 7/27

$354

vie. 8/152:30 pmSTL - ABE

2 stops7h 23mMultiple Airlines

lun. 8/186:30 amABE - STL

3 stops13h 11mMultiple Airlines

Deal found 7/29

$420

mar. 8/121:20 pmSTL - ABE

1 stop7h 35mUnited Airlines

sáb. 8/165:35 pmABE - STL

1 stop6h 10mUnited Airlines

Deal found 7/28

$633

Last-minute flights from St. Louis to Allentown
Discover last-minute flight deals from St. Louis to Allentown. Data last updated julio 29, 2025 and is based on user searches.

dom. 8/36:00 amSTL - ABE

1 stop5h 15mDelta

dom. 8/106:00 amABE - STL

1 stop4h 41mDelta

Deal found 7/27

$354

dom. 8/310:47 amSTL - ABE

2 stops10h 13mMultiple Airlines

jue. 8/74:11 pmABE - STL

3 stops18h 41mMultiple Airlines

Deal found 7/27

$678

lun. 8/44:28 pmSTL - ABE

1 stop6h 59mAmerican Airlines

sáb. 8/98:07 pmABE - STL

1 stop4h 48mAmerican Airlines

Deal found 7/27

$474

mar. 8/121:20 pmSTL - ABE

1 stop7h 35mUnited Airlines

sáb. 8/165:35 pmABE - STL

1 stop6h 10mUnited Airlines

Deal found 7/28

$633

vie. 8/152:30 pmSTL - ABE

2 stops7h 23mMultiple Airlines

lun. 8/186:30 amABE - STL

3 stops13h 11mMultiple Airlines

Deal found 7/29

$420

mié. 8/273:43 pmSTL - ABE

1 stop5h 01mAmerican Airlines

mar. 9/26:32 pmABE - STL

1 stop5h 33mAmerican Airlines

Deal found 7/29

$249

One-way flights from St. Louis to Allentown
Search for one-way flight options from St. Louis to Allentown. Find affordable one-way fares based on user searches. Data last updated julio 29, 2025.

lun. 9/13:42 pmSTL - ABE

1 stop5h 57mDelta

Deal found 7/29

$249

vie. 8/110:47 amSTL - ABE

2 stops22h 15mMultiple Airlines

Deal found 7/27

$287

mar. 8/51:17 pmSTL - ABE

2 stops10h 10mAmerican Airlines

Deal found 7/27

$506

lun. 8/45:30 pmSTL - ABE

1 stop22h 30mUnited Airlines

Deal found 7/27

$771

Fly from

Fly to

Route

Depart

Return

Price

St. LouisAllentown

STL - ABE

STLABE

Lambert-St Louis

mié. 8/27

3:43 pm-9:44 pm

1 stop5h 01m

Allentown-Bethlehem

mar. 9/2

6:32 pm-11:05 pm

1 stop5h 33m

$249

St. LouisAllentown

STL - ABE

STLABE

Lambert-St Louis

dom. 8/3

6:00 am-12:15 pm

1 stop5h 15m

Allentown-Bethlehem

dom. 8/10

6:00 am-9:41 am

1 stop4h 41m

$354

St. LouisAllentown

STL - ABE

STLABE

Lambert-St Louis

vie. 8/15

2:30 pm-10:53 pm

2 stops7h 23m

Allentown-Bethlehem

lun. 8/18

6:30 am-6:41 pm

3 stops13h 11m

$420

St. LouisAllentown

STL - ABE

STLABE

Lambert-St Louis

mar. 8/12

1:20 pm-9:55 pm

1 stop7h 35m

Allentown-Bethlehem

sáb. 8/16

5:35 pm-10:45 pm

1 stop6h 10m

$633

St. LouisAllentown

STL - ABE

STLABE

Lambert-St Louis

lun. 9/1

3:42 pm-10:39 pm

1 stop5h 57m

$249

St. LouisAllentown

STL - ABE

STLABE

Lambert-St Louis

vie. 8/1

10:47 am-10:02 am

2 stops22h 15m

$287

St. LouisAllentown

STL - ABE

STLABE

Lambert-St Louis

mar. 8/5

1:17 pm-12:27 am

2 stops10h 10m

$506

St. LouisAllentown

STL - ABE

STLABE

Lambert-St Louis

lun. 8/4

5:30 pm-5:00 pm

1 stop22h 30m

$771

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Best time to book a flight from St. Louis to Allentown

Have a flexible travel schedule? Discover the best time to fly to Allentown 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 Allentown

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

Currently, February is the cheapest month in which you can book a flight from St. Louis to Allentown (average of $289). Flying from St. Louis to Allentown in December is currently the most expensive (average of $395). 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.

Reviews of airlines servicing Allentown

Get a feel of what it's like to fly with Delta, United Airlines, and American Airlines from St. Louis to Allentown by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very good

7,977 reviews

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

7,977 reviews

Delta

8.0

Very good

7,977 reviews

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

8,899 reviews

Delta

8.0

Very good

7,977 reviews

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

7,977 reviews

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

What are the cheapest airlines flying from St. Louis to Allentown round-trip?
Currently priced at $249, American Airlines will fly you from St. Louis to Allentown and back. In addition to American Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Delta and United Airlines - these airlines can fly you to your destination from $354 and $633, respectively. Users have found that American Airlines is 30% cheaper than the other options available to this destination.
What are the cheapest airlines to fly from St. Louis to Allentown one-way?
The cheapest airline one-way is Delta, with whom users have recently found tickets for as low as $249. However, be on the lookout for offers from American Airlines and United Airlines, as they are both options that can get you from St. Louis to Allentown for a low price.
Can I find deals for flights from St. Louis to Allentown that include hotel bookings?
Yes. In addition to deals on St. Louis to Allentown flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from St. Louis to Allentown?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Allentown.
Can I find deals for business class flights from St. Louis to Allentown?
Yes. Cheapflights offers flight deals from St. Louis to Allentown 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 Allentown?
Currently, February is the cheapest month in which you can book a flight from St. Louis to Allentown (average of $289). Flying from St. Louis to Allentown in December is currently the most expensive (average of $395). 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

Browse thousands of different options on Cheapflights for your next trip

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Complete your trip

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Top 3 airlines flying from St. Louis to Allentown

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$223	Average$508	FlexibilityNo cancel fee	On-time69%
American Airlines	Cheapest$233	Average$343	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$303	Average$477	FlexibilityNo cancel fee	On-timeN/A

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$249+ Cheap flights from St. Louis to Allentown (STL - ABE)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/27. Fares are subject to change and may not be available on all flights or dates of travel.

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Cheap flight deals from St. Louis to Allentown

Round-trip from

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Find flight deals from St. Louis to Allentown

Cheapest flights from St. Louis to AllentownExplore the most affordable flight options available from St. Louis to Allentown. Find the lowest fares from popular airlines and budget airlines, with prices last updated on julio 29, 2025.

Explore the most affordable flight options available from St. Louis to Allentown. Find the lowest fares from popular airlines and budget airlines, with prices last updated on julio 29, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Allentown that are best for you.

Best time to book a flight from St. Louis to Allentown

Have a flexible travel schedule? Discover the best time to fly to Allentown from St. Louis with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Allentown

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

Reviews of airlines servicing Allentown

Get a feel of what it's like to fly with Delta, United Airlines, and American Airlines from St. Louis to Allentown by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

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

What are the cheapest airlines to fly from St. Louis to Allentown one-way?

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

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

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

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Other flights to Allentown

Explore flights to Allentown departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on julio 29, 2025.

Top 3 airlines flying from St. Louis to Allentown

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Cheapest flights from St. Louis to Allentown
Explore the most affordable flight options available from St. Louis to Allentown. Find the lowest fares from popular airlines and budget airlines, with prices last updated on julio 29, 2025.