
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $138 (Expedia) |
One-way from | $64 (Frontier) |
Popular in | May |
Cheapest in | August |
Average price | $397 |
Good round-trip deal | $401 or less |
Good one-way deal | $221 or less |
Fly from
Fly to
Route
Depart
Return
Price
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Sun 2/8
7:06 pm-6:51 am
1 stop12h 45m
Lambert-St Louis
Tue 2/10
3:49 pm-12:22 pm
1 stop19h 33m
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Sat 3/7
10:38 pm-5:57 am
1 stop8h 19m
Lambert-St Louis
Mon 3/9
8:12 pm-5:31 am
1 stop8h 19m
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Thu 2/26
3:15 pm-11:59 pm
1 stop9h 44m
Lambert-St Louis
Thu 3/5
3:49 pm-7:32 am
1 stop14h 43m
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Thu 2/19
7:12 pm-6:51 am
1 stop12h 39m
Lambert-St Louis
Sun 2/22
3:49 pm-9:45 pm
2 stops28h 56m
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Sat 3/7
10:38 pm-5:57 am
1 stop8h 19m
Lambert-St Louis
Mon 3/9
2:09 pm-8:44 am
2 stops17h 35m
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Mon 2/23
5:05 pm-6:40 pm
Nonstop2h 35m
Lambert-St Louis
Wed 2/25
8:20 am-11:30 am
Nonstop2h 10m
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Mon 2/23
5:05 pm-6:40 pm
Nonstop2h 35m
Lambert-St Louis
Tue 2/24
8:20 am-11:30 am
Nonstop2h 10m
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Wed 4/29
10:33 am-9:08 pm
2 stops11h 35m
Lambert-St Louis
Tue 5/5
7:45 am-9:33 pm
1 stop12h 48m
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Mon 2/23
5:00 pm-10:59 pm
1 stop6h 59m
Lambert-St Louis
Wed 2/25
9:55 am-5:14 pm
1 stop6h 19m
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Tue 2/24
11:40 am-6:51 am
1 stop20h 11m
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star |
Booking 87 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, March is the cheapest month in which you can book a flight from Philadelphia to St. Louis (average of $59). Flying from Philadelphia to St. Louis in December is currently the most expensive (average of $217). 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 in the afternoon. By choosing this option you can save up to 13% on the cost of your flight, compared to a flight at noon.
Travelers seeking maximum savings on their Philadelphia to St. Louis flight should consider departing on Saturday afternoons 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.
Comfort
Crew
Boarding
Food
Entertainment
Overall
Reviews
Thomas,Dec 2025
SEA - DEN
Comfort
Crew
Boarding
Food
Entertainment
Overall
Reviews
Thomas,Dec 2025
SEA - DEN
Comfort
Crew
Boarding
Food
Entertainment
Overall
Reviews
Thomas,Dec 2025
SEA - DEN
Comfort
Crew
Boarding
Food
Entertainment
Overall
Reviews
Thomas,Dec 2025
SEA - DEN
Comfort
Crew
Boarding
Food
Entertainment
Overall
Reviews
Thomas,Dec 2025
SEA - DEN
Comfort
Crew
Boarding
Food
Entertainment
Overall
Reviews
Thomas,Dec 2025
SEA - DEN
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$95 | Average$178 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$127 | Average$212 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$241 | Average$417 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$253 | Average$421 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$259 | Average$358 | FlexibilityNo cancel fee | On-timeN/A |