Southwest offers free snacks and non-alcoholic beverages, enhancing the flight experience.
Enjoy free messaging and in-flight entertainment streamed to your device.
Round-trip from | $323 (Mytrip) |
---|---|
One-way from | $55 (FlightHub) |
Popular in | May |
Cheapest in | August |
Average price | $291 |
Good round-trip deal | $355 or less |
Good one-way deal | $184 or less |
Fly from
Fly to
Route
Depart
Return
Price
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Fri 8/8
7:00 am-9:52 am
1 stop3h 52m
Lambert-St Louis
Sun 8/10
10:47 am-4:16 pm
3 stops28h 29m
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Fri 11/7
1:54 pm-7:03 pm
1 stop6h 09m
Lambert-St Louis
Sun 11/9
6:43 am-9:50 am
Nonstop2h 07m
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Thu 7/10
6:13 am-9:52 am
3 stops28h 39m
Lambert-St Louis
Mon 7/14
9:50 am-11:30 pm
3 stops12h 40m
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Sun 7/6
8:28 am-6:59 pm
1 stop11h 31m
Lambert-St Louis
Thu 7/10
2:27 pm-5:49 am
1 stop14h 22m
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Fri 10/3
10:10 am-7:05 pm
2 stops9h 55m
Lambert-St Louis
Sun 10/5
3:40 pm-11:05 pm
1 stop6h 25m
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Sat 7/12
6:30 am-10:40 am
1 stop5h 10m
Lambert-St Louis
Sat 7/19
5:30 pm-12:30 am
1 stop6h 00m
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Sun 7/13
6:00 am-9:33 am
1 stop4h 33m
Lambert-St Louis
Tue 7/15
6:40 am-11:45 am
1 stop4h 05m
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Sun 7/13
6:45 am-11:59 pm
1 stop18h 14m
Lambert-St Louis
Wed 7/23
6:00 am-5:55 pm
2 stops10h 55m
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Mon 7/28
7:00 am-9:52 am
1 stop3h 52m
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Tue 9/2
3:45 pm-5:10 pm
Nonstop2h 25m
Booking 80 days in advance of your planned departure date is, on average, the best time to get cheap flights from Philadelphia to St. Louis. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
Currently, August is the cheapest month in which you can book a flight from Philadelphia to St. Louis (average of $311). Flying from Philadelphia to St. Louis in March is currently the most expensive (average of $356). 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.
It’s optimal to fly from Philadelphia to St. Louis at noon. By choosing this option you can save up to 11% on the cost of your flight, compared to a flight in the morning.
Travelers seeking maximum savings on their Philadelphia to St. Louis flight should consider departing on Wednesday at noon when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
The most flights from PHL to STL are scheduled on a Monday (9 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (3 on average).
In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.
If weather is an important factor for your trip to St. Louis, 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 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).
Entertainment
Boarding
Food
Crew
Comfort
Overall
Reviews
James,Apr 2025
LAX - SFO
Entertainment
Boarding
Food
Crew
Comfort
Overall
Reviews
James,Apr 2025
LAX - SFO
Entertainment
Boarding
Food
Crew
Comfort
Overall
Reviews
James,Apr 2025
LAX - SFO
Entertainment
Boarding
Food
Crew
Comfort
Overall
Reviews
James,Apr 2025
LAX - SFO
Entertainment
Boarding
Food
Crew
Comfort
Overall
Reviews
James,Apr 2025
LAX - SFO
Entertainment
Boarding
Food
Crew
Comfort
Overall
Reviews
James,Apr 2025
LAX - SFO
Airline | Cheapest | Average | Flexibility | On-time |
---|---|---|---|---|
Cheapest$48 | Average$124 | FlexibilityNo cancel fee | On-time62% | |
Cheapest$157 | Average$359 | FlexibilityNo cancel fee | On-time71% | |
Cheapest$200 | Average$366 | FlexibilityNo cancel fee | On-timeN/A | |
Cheapest$279 | Average$416 | FlexibilityNo cancel fee | On-time63% |