Cheap flights from District of Columbia to Key West from $88

In general, September is the cheapest month to fly from District of Columbia to Key West. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $374. If you are unable to visit Key West during the month of September, then departing from District of Columbia during the month January is also very affordable. Most momondo users find prices during this month for around $394.

On average, the least expensive day to fly to Key West from District of Columbia is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $387. 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 District of Columbia to Key West for around $508.

According to our data, the cheapest time of day to fly to Key West is at noon. momondo users have found flights departing from District of Columbia to Key West at noon for as low as $402. 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 in the morning, with an average ticket price of $471. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

Fly from Washington, D.C. Dulles Intl to Key West for the best District of Columbia - Key West flight prices

You are more likely to see cheaper flights to Key West from District of Columbia when booking weeks ahead of your departure date. In general, you can expect to find flights to Key West for around $468 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Key West from District of Columbia for as low as $287 on momondo.

There are 4 cabin classes available to choose from on District of Columbia to Key West flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Delta and American Airlines are the most popular carriers operating from District of Columbia to Key West

American Airlines, Delta and United Airlines are the top three most popular airlines that fly to Key West from District of Columbia according to our data. American Airlines is the first choice among our users, with 69% 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.

The number of flights available between District of Columbia and Key West is 2 per day as of April 2026. The most frequent departure time is 12:00PM, with 70% of daily flights leaving in the afternoon.

As of April 2026, 19 flights take off from District of Columbia and land in Key West each week. The most common flight departure day for this route is Mon, with 16% of weekly flights taking off on this day.