How does KAYAK find such low prices on flights from Pennsylvania to St. Louis?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Pennsylvania to St. Louis. Visit our flight page for the latest deals!>/a>

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Pennsylvania to St. Louis?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Pennsylvania is likely to change within 7 days, so travelers know whether to wait or book now. Visit our flight page for the latest deals!>/a>

What is the Hacker Fare option on flights from Pennsylvania to St. Louis?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to St. Louis with an airline and back to Pennsylvania with another airline. Visit our flight page for the latest deals!>/a>

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Pennsylvania to St. Louis?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to St. Louis from Pennsylvania up to 3 days before/after your preferred dates. You can then pick the flights that suit you best. Visit our flight page for the latest deals!>/a>

$89 CHEAP FLIGHTS from Pennsylvania to St. Louis

STL

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Flights Deals

Cheap Flight Deals from Pennsylvania to St. Louis

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Pennsylvania to St. Louis that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from Pennsylvania to St. Louis

KAYAK's recommended round-trip deals from the most popular airlines that fly from Pennsylvania to St. Louis.

Discover the best prices for you by selecting your travel dates on KAYAK.

4:33 pm - 12:06 amPHL-STL

8h 33m1 stop

5:45 pm - 7:40 amSTL-PHL

12h 55m1 stop

$178Frontier

Find Deal

Mon, May 19 - Wed, May 21

8:15 am - 9:42 amDCA-STL

2h 27mnonstop

10:25 am - 1:24 pmSTL-DCA

1h 59mnonstop

$179American Airlines

Find Deal

Thu, May 29 - Fri, May 30

5:26 pm - 12:06 amIAD-STL

7h 40m1 stop

5:45 pm - 12:32 pmSTL-IAD

17h 47m1 stop

$181Frontier

Find Deal

Mon, May 19 - Wed, May 21

6:50 pm - 8:05 pmDCA-STL

2h 15mnonstop

7:05 pm - 10:05 pmSTL-DCA

2h 00mnonstop

$197Southwest

Find Deal

Sat, May 24 - Wed, May 28

6:00 am - 9:00 amIAD-STL

4h 00m1 stop

5:40 pm - 12:28 amSTL-IAD

5h 48m1 stop

$199Delta

Find Deal

Thu, May 29 - Fri, May 30

7:33 pm - 11:38 pmDCA-STL

5h 05m1 stop

8:30 am - 4:20 pmSTL-DCA

6h 50m1 stop

$199Delta

Find Deal

Sat, May 24 - Sat, May 31

1:54 pm - 3:11 pmDCA-STL

2h 17mnonstop

4:01 pm - 6:59 pmSTL-DCA

1h 58mnonstop

$204American Airlines

Find Deal

Thu, May 22 - Sun, May 25

6:50 pm - 8:05 pmDCA-STL

2h 15mnonstop

7:00 am - 2:50 pmSTL-DCA

6h 50m1 stop

$207Southwest

Find Deal

Sat, May 24 - Sun, May 25

9:27 pm - 7:49 amLGA-STL

11h 22m1 stop

8:44 am - 3:30 pmSTL-LGA

5h 46m1 stop

$213Spirit Airlines

Find Deal

Thu, Sep 25 - Sun, Sep 28

11:00 am - 5:04 pmEWR-STL

7h 04m1 stop

6:36 pm - 5:37 pmSTL-EWR

22h 01m1 stop

$214Spirit Airlines

Find Deal

Thu, Jun 12 - Sun, Jun 15

Useful Info

Low season	January
High season	May
Cheapest flight	$89

Best time to beat the crowds with an average 2% drop in price.

Most popular time to fly and prices are also 8% lower on average.

Flight from Washington Dulles Airport to St. Louis

How does KAYAK find such low prices on flights from Pennsylvania to St. Louis?
KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Pennsylvania to St. Louis.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Pennsylvania to St. Louis?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Pennsylvania is likely to change within 7 days, so travelers know whether to wait or book now.
What is the Hacker Fare option on flights from Pennsylvania to St. Louis?
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to St. Louis with an airline and back to Pennsylvania with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Pennsylvania to St. Louis?
Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to St. Louis from Pennsylvania up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Everything you need to know for your flight to St. Louis

Airports

Cabin class

Complete your trip

Direct Flights

Flights to other cities

Origins

Other airports

Return flight deals

Information on the airport you'll fly into in St. Louis

St. Louis (STL)

STL

$89 Find Cheap Flights from Pennsylvania to St. Louis

KAYAK searches hundreds of travel sites at once for deals on flights to St. Louis

Cheap Flight Deals from Pennsylvania to St. Louis

Recent round-trip flight deals from Pennsylvania to St. Louis

Recent one-way flight deals from Pennsylvania to St. Louis

Recent last minute flight deals from Pennsylvania to St. Louis

Recent direct flight deals from Pennsylvania to St. Louis

Good to know

FAQs for booking flights from Pennsylvania to St. Louis

How does KAYAK find such low prices on flights from Pennsylvania to St. Louis?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Pennsylvania to St. Louis.

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Pennsylvania to St. Louis?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Pennsylvania is likely to change within 7 days, so travelers know whether to wait or book now.

What is the Hacker Fare option on flights from Pennsylvania to St. Louis?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to St. Louis with an airline and back to Pennsylvania with another airline.

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Pennsylvania to St. Louis?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to St. Louis from Pennsylvania up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Everything you need to know for your flight to St. Louis

Information on the airport you'll fly into in St. Louis

Cabin class types available on flights to Pennsylvania

Complete your trip to St. Louis with a hotel stay or car rental

Find direct flights for St. Louis

Flights to other popular destinations

Flights from domestic origins to St. Louis

Choose which airport to fly into in St. Louis

Find deals for your return flight