Cheap flights from Philadelphia to San Juan from $79

If you’re not able to fly to San Juan in October, then January is your next best option. Flight prices from Philadelphia to San Juan during January average around $248.

The cheapest day to depart from Philadelphia to San Juan is on a Monday when prices can be found for as low as $317. The most expensive day to fly to San Juan is Friday, with ticket prices averaging around $351.

The cheapest time of day to fly to San Juan is at noon when flights can be purchased for as low as $265. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $374 on average. Flights to San Juan from Philadelphia in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.

Fly from Philadelphia to San Juan Luis Munoz Marin Intl for the best Philadelphia - San Juan flight prices

You are more likely to see cheaper flights to San Juan from Philadelphia when booking weeks ahead of your departure date. In general, you can expect to find flights to San Juan for around $312 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Juan from Philadelphia for as low as $290 on momondo.

There are 4 cabin classes available to choose from on Philadelphia to San Juan flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

United Airlines and Delta are the most popular carriers operating from Philadelphia to San Juan

Frontier, JetBlue and United Airlines are the top three most popular airlines that fly to San Juan from Philadelphia according to our data. Frontier is the first choice among our users, with 42% of people opting to fly with this airline when traveling to San Juan. Keep in mind that there are 6 different airlines that fly to San Juan on a routine basis, so you have a few additional options to choose from.

Historically, on average around 30% of flights between Philadelphia and San Juan have experienced a delay on any given week. The average delay length over the past 12 months has been 147 minutes.

Generally, flights departing at night tend to experience fewer delays. Flights in the evening have, in the past, seen delays more frequently in comparison.

Wednesday is statistically the day of the week which experiences the fewest number of delays on this flight route. Monday has historically seen more delays on average compared to the rest of the week.

According to our data, American Airlines have had the least number of delays on this route over the last 12 months; with about 25% of their flights experiencing any sort of delay.

As of August 2026, there are 5 flights per day flying from Philadelphia to San Juan. The most common time of day flights depart is 6:00PM, with 48% of flights taking off in the evening.

37 flights are operational weekly from Philadelphia to San Juan as of August 2026. The most popular departure day for this route is Mon, with 22% of flights per week taking off on this day.