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Cheap flights from Allentown to St. Louis from $136

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Allentown to St. Louis departing on 10/19. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Allentown to St. Louis

Cheap round-trip flights

Delta Logo
5:40 pm - 11:40 pmABE-STL
7h 00m1 stop
Delta Logo
5:00 pm - 10:52 pmSTL-ABE
4h 52m1 stop
$249Delta
Find Deal
Sat, Feb 21 - Tue, Feb 24
Delta Logo
6:00 pm - 10:04 pmABE-STL
5h 04m1 stop
Delta Logo
6:00 am - 12:16 pmSTL-ABE
5h 16m1 stop
$274Delta
Find Deal
Sat, Nov 1 - Sun, Nov 9
American Airlines Logo
5:14 pm - 9:28 pmABE-STL
5h 14m1 stop
American Airlines Logo
8:13 am - 3:53 pmSTL-ABE
6h 40m1 stop
$279American Airlines
Find Deal
Sat, Dec 13 - Wed, Dec 17
United Airlines Logo
5:28 pm - 10:35 pmABE-STL
6h 07m1 stop
United Airlines Logo
3:23 pm - 9:54 pmSTL-ABE
5h 31m1 stop
$299United Airlines
Find Deal
Tue, Oct 7 - Sat, Oct 11
Delta Logo
6:00 pm - 10:04 pmABE-STL
5h 04m1 stop
Delta Logo
3:59 pm - 10:15 pmSTL-ABE
5h 16m1 stop
$329Delta
Find Deal
Tue, Oct 7 - Sat, Oct 11
Delta Logo
12:48 pm - 7:05 pmABE-STL
7h 17m1 stop
Delta Logo
6:01 am - 12:04 pmSTL-ABE
5h 03m1 stop
$354Delta
Find Deal
Sat, Oct 4 - Sun, Oct 5
United Airlines Logo
6:30 am - 10:49 amABE-STL
5h 19m1 stop
United Airlines Logo
5:00 am - 10:38 amSTL-ABE
4h 38m1 stop
$369United Airlines
Find Deal
Fri, Oct 3 - Sun, Oct 5
American Airlines Logo
1:43 pm - 5:13 pmABE-STL
4h 30m1 stop
American Airlines Logo
12:58 pm - 12:16 amSTL-ABE
10h 18m2 stops
$372American Airlines
Find Deal
Sat, Feb 21 - Tue, Feb 24
Multiple Airlines Logo
12:14 pm - 6:36 pmABE-STL
7h 22m2 stops
Multiple Airlines Logo
5:12 pm - 8:26 pmSTL-ABE
26h 14m1 stop
$393Multiple Airlines
Find Deal
Sun, Nov 2 - Sun, Nov 9
Multiple Airlines Logo
2:17 pm - 3:04 pmABE-STL
25h 47m2 stops
Multiple Airlines Logo
6:05 pm - 11:11 pmSTL-ABE
28h 06m1 stop
$404Multiple Airlines
Find Deal
Sat, Oct 4 - Thu, Oct 9

American Airlines flights from Allentown to St. Louis

Our best American Airlines deals on Allentown to St. Louis flight tickets
American Airlines
Dec 13
ABE5:14 pmAllentown-Bethlehem
5h 14m
1 stop
STL9:28 pmLambert-St Louis
Dec 17
STL8:13 amLambert-St Louis
6h 40m
1 stop
ABE3:53 pmAllentown-Bethlehem
$279
Find similar
American Airlines
Oct 2
ABE7:59 pmAllentown-Bethlehem
4h 54m
1 stop
STL11:53 pmLambert-St Louis
Oct 5
STL7:22 amLambert-St Louis
4h 38m
1 stop
ABE1:00 pmAllentown-Bethlehem
$284
Find similar
American Airlines
Feb 21
ABE1:43 pmAllentown-Bethlehem
4h 30m
1 stop
STL5:13 pmLambert-St Louis
Feb 24
STL12:58 pmLambert-St Louis
10h 18m
2 stops
ABE12:16 amAllentown-Bethlehem
$372
Find similar

United Airlines flights from Allentown to St. Louis

Our best United Airlines deals on Allentown to St. Louis flight tickets
United Airlines
Oct 7
ABE5:28 pmAllentown-Bethlehem
6h 07m
1 stop
STL10:35 pmLambert-St Louis
Oct 11
STL3:23 pmLambert-St Louis
5h 31m
1 stop
ABE9:54 pmAllentown-Bethlehem
$299
Find similar
United Airlines
Oct 3
ABE6:30 amAllentown-Bethlehem
5h 19m
1 stop
STL10:49 amLambert-St Louis
Oct 5
STL5:00 amLambert-St Louis
4h 38m
1 stop
ABE10:38 amAllentown-Bethlehem
$369
Find similar
United Airlines
Oct 7
ABE1:00 pmAllentown-Bethlehem
24h 44m
2 stops
STL12:44 pmLambert-St Louis
Oct 11
STL3:23 pmLambert-St Louis
5h 31m
1 stop
ABE9:54 pmAllentown-Bethlehem
$557
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Allentown 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, momondo users made 832,500 searches. Data last updated September 23, 2025.
Use the filters below to find and compare flights from Allentown to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

AllentownSt. Louis

ABE - STL

ABESTL

Allentown-Bethlehem

Sat 2/21

5:40 pm-11:40 pm

1 stop7h 00m

Lambert-St Louis

Tue 2/24

5:00 pm-10:52 pm

1 stop4h 52m

$249

AllentownSt. Louis

ABE - STL

ABESTL

Allentown-Bethlehem

Sat 11/1

6:00 pm-10:04 pm

1 stop5h 04m

Lambert-St Louis

Sun 11/9

6:00 am-12:16 pm

1 stop5h 16m

$274

AllentownSt. Louis

ABE - STL

ABESTL

Allentown-Bethlehem

Sat 12/13

5:14 pm-9:28 pm

1 stop5h 14m

Lambert-St Louis

Wed 12/17

8:13 am-3:53 pm

1 stop6h 40m

$279

AllentownSt. Louis

ABE - STL

ABESTL

Allentown-Bethlehem

Tue 10/7

5:28 pm-10:35 pm

1 stop6h 07m

Lambert-St Louis

Sat 10/11

3:23 pm-9:54 pm

1 stop5h 31m

$299

AllentownSt. Louis

ABE - STL

ABESTL

Allentown-Bethlehem

Tue 10/7

6:00 pm-10:04 pm

1 stop5h 04m

Lambert-St Louis

Sat 10/11

3:59 pm-10:15 pm

1 stop5h 16m

$329

AllentownSt. Louis

ABE - STL

ABESTL

Allentown-Bethlehem

Sat 10/4

12:48 pm-7:05 pm

1 stop7h 17m

Lambert-St Louis

Sun 10/5

6:01 am-12:04 pm

1 stop5h 03m

$354

AllentownSt. Louis

ABE - STL

ABESTL

Allentown-Bethlehem

Fri 10/3

6:30 am-10:49 am

1 stop5h 19m

Lambert-St Louis

Sun 10/5

5:00 am-10:38 am

1 stop4h 38m

$369

AllentownSt. Louis

ABE - STL

ABESTL

Allentown-Bethlehem

Sat 2/21

1:43 pm-5:13 pm

1 stop4h 30m

Lambert-St Louis

Tue 2/24

12:58 pm-12:16 am

2 stops10h 18m

$372

AllentownSt. Louis

ABE - STL

ABESTL

Allentown-Bethlehem

Sun 11/2

12:14 pm-6:36 pm

2 stops7h 22m

Lambert-St Louis

Sun 11/9

5:12 pm-8:26 pm

1 stop26h 14m

$393

AllentownSt. Louis

ABE - STL

ABESTL

Allentown-Bethlehem

Sat 10/4

2:17 pm-3:04 pm

2 stops25h 47m

Lambert-St Louis

Thu 10/9

6:05 pm-11:11 pm

1 stop28h 06m

$404

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to St. Louis from

How to get the cheapest flight ticket from Allentown to St. Louis

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

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

In general, June is the cheapest month to fly from Allentown to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $278. The month of September is another great option to travel to St. Louis, with average flight prices from Allentown averaging around $282.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Tuesday when prices can be found for as low as $263. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $491. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Allentown in the evening is the least expensive time of day to depart. momondo users have found prices as low as $254 when looking at flights departing in the evening. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $318 per ticket.

When to book flights from Allentown to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from Allentown to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Allentown to St. Louis (ABE to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Allentown to St. Louis

Direct flights

None
There are no direct flights from Allentown to St. Louis. There are no popular flight routes from Allentown to St. Louis.
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  • How far is Allentown-Bethlehem to Lambert-St Louis by plane?

    There are 794.2 mi between Allentown-Bethlehem and Lambert-St Louis. In terms of flight time, this usually takes a little over 4h 30m.

  • When did momondo last update prices for flights from Allentown-Bethlehem Airport to Lambert-St Louis Airport?

    Prices for flights from Allentown-Bethlehem Airport to Lambert-St Louis Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Allentown-Bethlehem Airport to Lambert-St Louis Airport?

  • How old do you have to be to fly from Allentown-Bethlehem Airport to Lambert-St Louis Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Allentown-Bethlehem Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The necessary travel and health documents for your Lambert-St Louis Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Allentown to St. Louis?

Best airlines flying from Allentown to St. Louis

Compare and see reviews for airlines that fly from Allentown to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $228Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $242Free CancellationRating
7.9
7,974 reviews
Search Delta flights

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Fairview Heights
Hermann
Florissant
Maryland Heights
O'Fallon
Fenton
Collinsville
Wentzville
Alton
St. Peters
Farmington
Festus
Glencoe
Clayton
Edwardsville
Eureka
Litchfield
Shrewsbury

Why use momondo?

Why should I use momondo to find a flight deal from Allentown to St. Louis?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Allentown to St. Louis. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Allentown to St. Louis with flexible booking policies on momondo?

Yes. All flights to St. Louis from Allentown on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Allentown to St. Louis?

Once you have performed a search for Allentown to St. Louis flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Allentown to St. Louis right now. Can momondo alert me if prices change?

Price alerts on flights to St. Louis from Allentown are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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