Frontier's UpFront Plus seats guarantee an empty middle seat for extra comfort.
Frontier's Economy Bundle includes a carry-on bag, seat selection, and no cancellation fees.

Most accurate provider | CheapOair 3 stars |
|---|---|
Most trusted provider | CheapOair 3 stars |
Round-trip from | $168 (CheapOair) |
One-way from | $86 (Kiwi.com) |
Popular in | December |
Cheapest in | October |
Average price | $231 |
Good round-trip deal | $288 or less |
Good one-way deal | $153 or less |
Fly from
Fly to
Route
Depart
Return
Price
PhiladelphiaSan Juan
PHL - SJU
PHLSJU
Philadelphia
Fri 12/12
6:55 am-5:28 pm
1 stop9h 33m
San Juan Luis Munoz Marin Intl
Tue 12/16
7:00 am-3:56 pm
1 stop9h 56m
PhiladelphiaSan Juan
PHL - SJU
PHLSJU
Philadelphia
Tue 1/20
6:00 am-2:10 pm
1 stop7h 10m
San Juan Luis Munoz Marin Intl
Tue 1/27
6:27 pm-12:23 am
1 stop6h 56m
PhiladelphiaSan Juan
PHL - SJU
PHLSJU
Philadelphia
Fri 1/16
8:40 am-6:02 pm
1 stop8h 22m
San Juan Luis Munoz Marin Intl
Fri 1/23
6:10 am-12:35 pm
1 stop7h 25m
PhiladelphiaSan Juan
PHL - SJU
PHLSJU
Philadelphia
Mon 12/29
8:40 am-7:23 pm
1 stop9h 43m
San Juan Luis Munoz Marin Intl
Sun 1/4
6:00 am-3:37 pm
1 stop10h 37m
PhiladelphiaSan Juan
PHL - SJU
PHLSJU
Philadelphia
Tue 11/18
10:05 am-10:22 pm
2 stops11h 17m
San Juan Luis Munoz Marin Intl
Tue 12/9
2:05 am-2:07 pm
2 stops13h 02m
PhiladelphiaSan Juan
PHL - SJU
PHLSJU
Philadelphia
Mon 12/8
10:15 am-10:22 pm
2 stops11h 07m
San Juan Luis Munoz Marin Intl
Fri 12/12
2:05 am-2:07 pm
2 stops13h 02m
PhiladelphiaSan Juan
PHL - SJU
PHLSJU
Philadelphia
Tue 12/2
12:05 pm-12:35 am
2 stops11h 30m
San Juan Luis Munoz Marin Intl
Sat 12/6
6:15 am-4:30 pm
2 stops11h 15m
PhiladelphiaSan Juan
PHL - SJU
PHLSJU
Philadelphia
Thu 12/11
6:30 am-10:22 pm
2 stops14h 52m
San Juan Luis Munoz Marin Intl
Fri 12/12
2:05 am-2:07 pm
2 stops13h 02m
PhiladelphiaSan Juan
PHL - SJU
PHLSJU
Philadelphia
Tue 12/9
10:15 am-10:22 pm
2 stops11h 07m
San Juan Luis Munoz Marin Intl
Thu 1/29
7:45 am-4:36 pm
1 stop9h 51m
PhiladelphiaSan Juan
PHL - SJU
PHLSJU
Philadelphia
Tue 11/18
10:05 am-12:36 am
2 stops13h 31m
San Juan Luis Munoz Marin Intl
Mon 11/24
2:05 am-2:06 pm
2 stops13h 01m
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars |
The best time to book flights from Philadelphia to San Juan Luis Munoz Marin Intl Airport is 28 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
Currently, March is the cheapest month in which you can book a flight from Philadelphia to San Juan Luis Munoz Marin Intl Airport (average of $79). Flying from Philadelphia to San Juan Luis Munoz Marin Intl Airport in August is currently the most expensive (average of $138). 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 typically best to fly out from Philadelphia to San Juan Luis Munoz Marin Intl Airport in the evening. Doing so could potentially save you 22% on the flight price compared to flying at noon, which is usually more expensive.
Travelers seeking maximum savings on their Philadelphia to San Juan Luis Munoz Marin Intl Airport flight should consider departing on Thursday at noon when fares are most often at their lowest. Friday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
About 28% of weekly flights between Philadelphia and San Juan have experienced delays in the past year, with the average delay time being 154 minutes.
Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.
Saturday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.
Over the last year, American Airlines have had the lowest number of delays on this route, with just 22% of flights being delayed.
Chicago (ORD) – chosen by Cheapflights users on 25% of 1-stop itineraries from Philadelphia to San Juan Luis Munoz Marin Intl Airport on Cheapflights.
Flights via Washington, D.C. (IAD) have the shortest average one-way travel time for 1-stop routes: 6h 19m.
Flights via Washington, D.C. (IAD) have the shortest average one-way travel time for 1-stop routes: 6h 19m.
Flights via Washington, D.C. (IAD) offer the fastest connection on this route, with an average layover time of 1h 18m.
Entertainment
Food
Comfort
Boarding
Overall
Crew
Reviews
Matthew,Oct 2025
GSP - ATL
Entertainment
Food
Comfort
Boarding
Overall
Crew
Reviews
Matthew,Oct 2025
GSP - ATL
Entertainment
Food
Comfort
Boarding
Overall
Crew
Reviews
Matthew,Oct 2025
GSP - ATL
Entertainment
Food
Comfort
Boarding
Overall
Crew
Reviews
Matthew,Oct 2025
GSP - ATL
Entertainment
Food
Comfort
Boarding
Overall
Crew
Reviews
Matthew,Oct 2025
GSP - ATL
Entertainment
Food
Comfort
Boarding
Overall
Crew
Reviews
Matthew,Oct 2025
GSP - ATL
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$100 | Average$167 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$130 | Average$269 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$148 | Average$281 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$213 | Average$448 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$215 | Average$334 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$244 | Average$472 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$289 | Average$401 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$420 | Average$485 | FlexibilityNo cancel fee | On-time69% |