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Cheap flights from Pennsylvania to St. Louis from $62

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Pennsylvania to St. Louis departing on 2/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Pennsylvania to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
6:00 pm - 11:33 pm
EWR
-
STL
30h 33m1 stop
Multiple Airlines Logo
5:42 pm - 10:00 am
STL
-
EWR
15h 18m1 stop
$123Multiple Airlines
Tue, Feb 3 - Mon, Feb 9
Multiple Airlines Logo
3:30 pm - 11:33 pm
EWR
-
STL
9h 03m1 stop
Multiple Airlines Logo
5:42 pm - 10:00 am
STL
-
EWR
15h 18m1 stop
$128Multiple Airlines
Fri, Feb 6 - Mon, Feb 9
Frontier Logo
4:14 pm - 10:27 pm
PHL
-
STL
7h 13m1 stop
Frontier Logo
5:18 pm - 4:37 pm
STL
-
PHL
22h 19m1 stop
$128Frontier
Tue, Mar 3 - Wed, Mar 4
Frontier Logo
10:35 am - 11:33 pm
PHL
-
STL
13h 58m1 stop
Frontier Logo
3:49 pm - 12:22 pm
STL
-
PHL
19h 33m1 stop
$130Frontier
Tue, Feb 3 - Tue, Feb 10
American Airlines Logo
7:51 pm - 9:37 pm
DCA
-
STL
2h 46mnonstop
American Airlines Logo
3:49 pm - 6:58 pm
STL
-
DCA
2h 09mnonstop
$245American Airlines
Thu, Feb 19 - Fri, Feb 20
Southwest Logo
12:00 pm - 1:35 pm
DCA
-
STL
2h 35mnonstop
Southwest Logo
8:30 am - 1:00 pm
STL
-
DCA
3h 30m1 stop
$251Southwest
Thu, Feb 19 - Fri, Feb 20
Delta Logo
7:00 am - 12:54 pm
IAD
-
STL
6h 54m1 stop
Delta Logo
5:30 pm - 12:09 am
STL
-
IAD
5h 39m1 stop
$254Delta
Wed, May 13 - Mon, May 25
Delta Logo
1:45 pm - 8:09 pm
DCA
-
STL
7h 24m1 stop
Delta Logo
1:13 pm - 6:48 pm
STL
-
DCA
4h 35m1 stop
$254Delta
Mon, Feb 16 - Tue, Feb 17
American Airlines Logo
1:46 pm - 3:13 pm
DCA
-
STL
2h 27mnonstop
American Airlines Logo
7:05 am - 12:38 pm
STL
-
DCA
4h 33m1 stop
$255American Airlines
Thu, Apr 9 - Fri, Apr 10
Southwest Logo
7:25 am - 1:45 pm
DCA
-
STL
7h 20m2 stops
Southwest Logo
10:35 am - 3:20 pm
STL
-
DCA
3h 45m1 stop
$259Southwest
Thu, Apr 23 - Sat, Apr 25

Southwest flights from Pennsylvania to St. Louis

Our best Southwest deals on Pennsylvania to St. Louis flight tickets
Southwest
Feb 17
PIT1:25 pmPittsburgh
3h 30m
1 stop
STL3:55 pmLambert-St Louis
Feb 18
STL6:15 pmLambert-St Louis
1h 35m
PIT8:50 pmPittsburgh
$252
Southwest
Feb 17
PIT6:35 pmPittsburgh
1h 55m
STL7:30 pmLambert-St Louis
Feb 18
STL6:15 pmLambert-St Louis
1h 35m
PIT8:50 pmPittsburgh
$254
Southwest
May 4
DCA7:25 amWashington, D.C. Reagan-National
7h 20m
2 stops
STL1:45 pmLambert-St Louis
May 6
STL7:35 amLambert-St Louis
3h 45m
1 stop
DCA12:20 pmWashington, D.C. Reagan-National
$259

Delta flights from Pennsylvania to St. Louis

Our best Delta deals on Pennsylvania to St. Louis flight tickets
Delta
May 13
IAD7:00 amWashington, D.C. Dulles Intl
6h 54m
1 stop
STL12:54 pmLambert-St Louis
May 25
STL5:30 pmLambert-St Louis
5h 39m
1 stop
IAD12:09 amWashington, D.C. Dulles Intl
$254
Delta
Feb 27
IAD6:00 amWashington, D.C. Dulles Intl
4h 32m
1 stop
STL9:32 amLambert-St Louis
Mar 2
STL6:47 pmLambert-St Louis
4h 34m
1 stop
IAD12:21 amWashington, D.C. Dulles Intl
$265
Delta
May 5
JFK6:15 amNew York John F Kennedy Intl
6h 51m
1 stop
STL12:06 pmLambert-St Louis
May 8
STL7:05 pmLambert-St Louis
5h 02m
1 stop
JFK1:07 amNew York John F Kennedy Intl
$267

momondo Fare Finder

 
Customize your flight search to find flights from Pennsylvania 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 January 8, 2026.
Use the filters below to find and compare flights from Pennsylvania to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

NewarkSt. Louis

EWR - STL

EWRSTL

Newark

Tue 2/3

6:00 pm-11:33 pm

1 stop30h 33m

Lambert-St Louis

Mon 2/9

5:42 pm-10:00 am

1 stop15h 18m

$123

NewarkSt. Louis

EWR - STL

EWRSTL

Newark

Fri 2/6

3:30 pm-11:33 pm

1 stop9h 03m

Lambert-St Louis

Mon 2/9

5:42 pm-10:00 am

1 stop15h 18m

$128

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Tue 3/3

4:14 pm-10:27 pm

1 stop7h 13m

Lambert-St Louis

Wed 3/4

5:18 pm-4:37 pm

1 stop22h 19m

$128

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Tue 2/3

10:35 am-11:33 pm

1 stop13h 58m

Lambert-St Louis

Tue 2/10

3:49 pm-12:22 pm

1 stop19h 33m

$130

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Thu 2/19

7:51 pm-9:37 pm

Nonstop2h 46m

Lambert-St Louis

Fri 2/20

3:49 pm-6:58 pm

Nonstop2h 09m

$245

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Thu 2/19

12:00 pm-1:35 pm

Nonstop2h 35m

Lambert-St Louis

Fri 2/20

8:30 am-1:00 pm

1 stop3h 30m

$251

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Wed 5/13

7:00 am-12:54 pm

1 stop6h 54m

Lambert-St Louis

Mon 5/25

5:30 pm-12:09 am

1 stop5h 39m

$254

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Mon 2/16

1:45 pm-8:09 pm

1 stop7h 24m

Lambert-St Louis

Tue 2/17

1:13 pm-6:48 pm

1 stop4h 35m

$254

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Thu 4/9

1:46 pm-3:13 pm

Nonstop2h 27m

Lambert-St Louis

Fri 4/10

7:05 am-12:38 pm

1 stop4h 33m

$255

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Thu 4/23

7:25 am-1:45 pm

2 stops7h 20m

Lambert-St Louis

Sat 4/25

10:35 am-3:20 pm

1 stop3h 45m

$259

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 Pennsylvania 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, August is the cheapest month to fly from Pennsylvania to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $320. The month of September is another great option to travel to St. Louis, with average flight prices from Pennsylvania averaging around $320.

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 Wednesday when prices can be found for as low as $386. 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 Sunday because tickets tend to average around $469. 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 Pennsylvania in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $377 when looking at flights departing in the afternoon. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $432 per ticket.

What is the cheapest Pennsylvania to Lambert-St Louis flight route?

Fly from Philadelphia to Lambert-St Louis for the best Pennsylvania - Lambert-St Louis flight prices

How far in advance should I book a flight to St. Louis?

You are more likely to see cheaper flights to St. Louis from Pennsylvania when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $404 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Pennsylvania for as low as $294 on momondo.

What cabin class options are available on Pennsylvania to Lambert-St Louis flights?

There are 2 cabin classes available to choose from on Pennsylvania to Lambert-St Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Pennsylvania to St. Louis flights?

No. A direct flight is the cheapest option for a flight between Pennsylvania to St. Louis.

Cheap Pennsylvania to St. Louis flight deals and tips

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

Best Price Found

$224

Fastest flight time

1h 45m

Direct flights

Every day

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from Pennsylvania in the past 72 hours is $224. The best round-trip flight deal from Pennsylvania to St. Louis found on momondo in the last 72 hours is $321.
The fastest flight from Pennsylvania to St. Louis takes 1h 45m
Direct flights go from Pennsylvania to St. Louis every day.
There is 1 airport in St. Louis. From Pennsylvania there are direct flights to Lambert-St Louis (STL).
Search flight deals

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

    Prices for flights from Pennsylvania to Lambert-St Louis Airport refresh daily.

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

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Pennsylvania to Lambert-St Louis Airport.

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

    The required travel and health documents for your Lambert-St Louis Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Lambert-St Louis Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from Pennsylvania to St. Louis?

Best airlines flying from Pennsylvania to St. Louis

Compare and see reviews for airlines that fly from Pennsylvania to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
Spirit AirlinesPriceFrom $95Free CancellationRating
6.3
8,287 reviews
Search Spirit Airlines flights
FrontierPriceFrom $130Free CancellationRating
5.7
3,061 reviews
Search Frontier flights
American AirlinesPriceFrom $170Free CancellationRating
7.2
11,097 reviews
Search American Airlines flights
United AirlinesPriceFrom $236Free CancellationRating
7.4
9,139 reviews
Search United Airlines flights
SouthwestPriceFrom $241Free CancellationRating
8.0
4,250 reviews
Search Southwest flights
DeltaPriceFrom $242Free CancellationRating
7.9
8,027 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
Hermann
Fairview Heights
O'Fallon
Maryland Heights
Florissant
Fenton
Collinsville
St. Peters
Wentzville
Alton
Farmington
Clayton
Eureka
Festus
Edwardsville
Glencoe
Litchfield
Shrewsbury

Why use momondo?

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

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

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

momondo does allow users to show only those flights to St. Louis from Pennsylvania which offer a flexible booking policy as well as other useful filters and features.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to St. Louis from Pennsylvania.

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

Yes momondo offers price alerts on flights to St. Louis from Pennsylvania. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your St. Louis trip

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