Cheap flights from Philadelphia to Key West from $91

In general, August is the cheapest month to fly from Philadelphia to Key West. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $465. If you are unable to visit Key West during the month of August, then departing from Philadelphia during the month July is also very affordable. Most momondo users find prices during this month for around $512.

On average, the least expensive day to fly to Key West from Philadelphia is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $516. However, this price may fluctuate depending on the airline, the season, and holidays. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Philadelphia to Key West for around $647.

Fly from Philadelphia to Key West for the best Philadelphia - Key West flight prices

You are more likely to see cheaper flights to Key West from Philadelphia when booking weeks ahead of your departure date. In general, you can expect to find flights to Key West for around $565 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Key West from Philadelphia for as low as $460 on momondo.

There are 3 cabin classes available to choose from on Philadelphia to Key West flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

You could potentially save up to 32% on your flight if you consider stops on a Philadelphia to Key West flight.

Spirit Airlines is the most popular carrier operating from Philadelphia to Key West

American Airlines, United Airlines and Delta are the top three most popular airlines that fly to Key West from Philadelphia according to our data. American Airlines is the first choice among our users, with 60% of people opting to fly with this airline when traveling to Key West. Keep in mind that there are 4 different airlines that fly to Key West on a routine basis, so you have a few additional options to choose from.

Atlanta (ATL) was the most common stop: 80% of momondo users choosing 1-stop flights on this route connected there.

Flights via Atlanta (ATL) offer the lowest average round-trip price of $613.

Flights connecting via Charlotte (CLT) have the shortest average one-way travel time: 5h 10m.

Charlotte (CLT) has the shortest average layover time for this route: 0h 48m.

As of March 2026, there are 1 flights per day flying from Philadelphia to Key West. The most common time of day flights depart is 10:00AM, with 100% of flights taking off at noon.

As of March 2026, 12 flights take off from Philadelphia and land in Key West each week. The most common flight departure day for this route is Mon, with 17% of weekly flights taking off on this day.