Cheap flights from the United States to Key West from $77

In general, September is the cheapest month to fly from United States to Key West. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $317. If you are unable to visit Key West during the month of September, then departing from United States during the month August is also very affordable. Most momondo users find prices during this month for around $323.

On average, the least expensive day to fly to Key West from United States is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $428. However, this price may fluctuate depending on the airline, the season, and holidays. When flying out on a Thursday, the most expensive travel day of the week, you can expect to see flight prices from United States to Key West for around $570.

According to our data, the cheapest time of day to fly to Key West is in the morning. momondo users have found flights departing from United States to Key West in the morning for as low as $482. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to Key West are more costly at noon, with an average ticket price of $519. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

Fly from Newark to Key West for the best United States - Key West flight prices

No. A direct flight is the cheapest option for a flight between United States to Key West.

Delta, United Airlines, and Allegiant Air are the most popular carriers operating from United States to Key West

American Airlines, United Airlines and Breeze Airways are the top three most popular airlines that fly to Key West from United States according to our data. American Airlines is the first choice among our users, with 56% of people opting to fly with this airline when traveling to Key West. Keep in mind that there are 8 different airlines that fly to Key West on a routine basis, so you have a few additional options to choose from.

Historically, on average around 15% of flights between United States and Key West have experienced a delay on any given week. The average delay length over the past 12 months has been 148 minutes.

Generally, flights departing in the morning tend to experience fewer delays. Flights in the early afternoon have, in the past, seen delays more frequently in comparison.

Thursday is statistically the day of the week which experiences the fewest number of delays on this flight route. Sunday 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 12% of their flights experiencing any sort of delay.

As of May 2026, there are 15 flights per day flying from United States to Key West. The most common time of day flights depart is 3:00PM, with 59% of flights taking off in the afternoon.

As of May 2026, there are 111 flights per week flying from United States to Key West. The most common day of the week flights depart is Tue, with 26% of flights taking off on this day.