$94 Cheap United flights from St. Louis to Philadelphia (STL to PHL)

Find The Best Day To Fly from St. Louis to Philadelphia

Amazing United STL to PHL Flight Deals

The cheapest flights to Philadelphia Intl. found within the past 7 days were $244 round trip and $94 one way. Prices and availability subject to change. Additional terms may apply.

Wed, Aug 21 - Mon, Aug 26
STL
St. Louis
PHL
Philadelphia
$244 Roundtrip, found 4 days ago
$244
Roundtrip
found 4 days ago
Select United flight, departing Wed, Aug 21 from St. Louis to Philadelphia, returning Mon, Aug 26, priced at $244 found 4 days ago

PHL From STL Economy Coach Packages on Similar Airlines

Price found within the past 48 hours. Click for updated prices.
Philadelphia Marriott Old City

Philadelphia Marriott Old City

4 out of 5
per person
May 23 - May 28
Roundtrip flight included
St. Louis (STL) to Philadelphia (PHL)
Renaissance Philadelphia Downtown Hotel

Renaissance Philadelphia Downtown Hotel

4 out of 5
per person
May 23 - May 28
Roundtrip flight included
St. Louis (STL) to Philadelphia (PHL)
The Westin Mount Laurel

The Westin Mount Laurel

4 out of 5
per person
May 23 - May 28
Roundtrip flight included
St. Louis (STL) to Philadelphia (PHL)
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Frequently asked questions

Can I catch a flight from St. Louis Lambert International Airport to Philadelphia Airport right now?
Be sure to check out the Covid-19 Travel Advisor to find out if there are any present quarantine requirements or travel advice reports in place in Philadelphia Airport when jet-setting from Lambert-St. Louis Intl. Airport (STL).
What terminal is United Airlines at St. Louis Lambert International Airport?
Once you receive the boarding pass for your United Airlines flight from STL to PHL, you should be able to see which terminals you’ll be jetting in and out of. Your carrier will have the answers if those details are missing from your ticket.
Are there United Airlines non-stop flights from STL to PHL?
As you can’t go nonstop from St. Louis Lambert International Airport to Philadelphia Airport with United Airlines, make the most of your stopover. Relax with some refreshments at a welcoming airport bar, or stroll about the terminal and enjoy a little retail therapy.
How long is a United Airlines flight from STL to PHL?
From the instant your United Airlines plane pushes back from the gate at STL to the moment it pulls into Philadelphia Intl. Airport (PHL), you’ll be in your seat for about 3 hours and 41 minutes. With such a brief flight time, it’s an ideal spur-of-the-moment vacation.
How many direct and indirect flights does United Airlines fly from STL to PHL?
If you’re considering a trip from STL to PHL, you can select from approximately 4 United Airlines flights each day.
If I am not able to travel due to COVID-19, can I change my booking to a later date?
For more info about changing your flight to Philadelphia Intl. Airport (PHL), please visit our Customer Service Portal.
What is the best day to buy a plane ticket?
This just in! Airfares offered on Thursdays tend to be the cheapest, according to flight demand on Travelocity in 2021. Tuesday and Wednesday prices are also good, but you may want to prepare your budget if booking during the weekend, as data shows that is when prices are generally at their highest.
What are the cheapest days to fly?
Frequent travelers may already know this, but earlier in the week can be the cheapest time to fly. In 2021, flights departing on a Monday were generally the cheapest of the week, whereas you may pay a premium for weekend flights when demand is usually high. On average, tickets were most expensive for Saturday departures, so if you need to fly out on a weekend, you might look for deals ahead of time.
How far in advance can you book a flight?
Trying to figure out how early you should book your flight? It’s possible to start comparing international airfares on Travelocity up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 0-2 weeks prior to their travel dates.*According to flight demand on Travelocity.com from January to December 2021. Savings are subject to change based on departure location, date and destination.

Discover our best United flight from St. Louis STL to Philadelphia PHL 

To find the best deals on flights to St. Louis from Philadelphia with United, just enter your travel dates, filter by United, and hit search. You’ll find flights to choose from and can sort by price, flight duration, and arrival or departure time.  

 

Return flights from St. Louis STL to Philadelphia PHL with United 

If you’re planning a round trip, booking return flights with United is usually the most cost-effective option. With airfares ranging from $244 to $244, it’s easy to find a flight that suits your budget. Prices and availability subject to change. Additional terms may apply. 

 

Book one-way United flights from St. Louis STL to Philadelphia PHL 

A one-way ticket gives you much greater flexibility—allowing you to choose your return date, destination, and time whenever you’re ready. By booking in advance you can find great deals on one-way tickets too. Right now, a one-way United flight from St. Louis to Philadelphia costs from $94. Prices and availability subject to change. Additional terms may apply. 

 

The easy way to find cheap flights to Philadelphia PHL from  St. Louis STL with United 

To find a cheap United flight from St. Louis STL to Philadelphia PHL, sort your search results by price or filter by budget. Thanks to Travelocity’s Price Match Promise, if you find a better airfare deal anywhere else within 24 hours, we’ll credit or refund the difference. 

 

How to find our best airfare deals on United flights from St. Louis STL to Philadelphia PHL 

If you’re looking for cheap flights, it helps to be flexible when it comes to your travel dates. You’ll usually find lower cost tickets when you travel during quieter months such as August, or if you book a flight with a stopover. 

 

Find nonstop flights from St. Louis STL to Philadelphia PHL with United 

If you’re keen to be on Philadelphia soil fast, don’t waste time with a stopover—filter your search results to show direct United flights only. The journey takes around hour(s) min(s) – so you’ll be there before you know it. 

 

Flexible airline tickets for United flights from St. Louis STL to Philadelphia PHL 

Make sure you’re not out of pocket if plans change by choosing a flexible ticket with penalty-free amendment and cancellation options. Use our ‘no change fee’ filter to see which flights have this option.  

 

There are a lot of reasons to book your flights to Philadelphia PHL from  St. Louis STL with United on Travelocity 

At Travelocity our vast and up-to-the-minute inventory puts all of our best flight deals in one place. So, whether you’re traveling on business or jetting off with friends and family, you can trust Travelocity to get you there.

United Airports
Hop on a(n) United flight today by flying to many destinations out of these domestic and international airports:
Airport code
Country
Airport name
Number of flights
ORDUSAO'Hare Intl.227
DENUSADenver Intl.226
IAHUSAGeorge Bush Intercontinental136
IADUSAWashington Dulles Intl.100
SFOUSASan Francisco Intl.64
LAXUSALos Angeles Intl.23
EWRUSALiberty Intl.20
FRADEUFrankfurt Intl.19
NRTJPNNarita Intl.19
PEKCHNCapital Intl.16

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Critical service link missing
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Lowest nightly price found within the past 24 hours based on a 1 night stay for 2 adults. Prices and availability subject to change. Additional terms may apply.
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