Cheap flights from Washington, D.C. Dulles Intl Airport to San Juan from $123

If you’re not able to fly to San Juan in October, then June is your next best option. Flight prices from Washington, D.C. Dulles Intl Airport to San Juan during June average around $330.

The cheapest day to depart from Washington, D.C. Dulles Intl Airport to San Juan is on a Sunday when prices can be found for as low as $364. The most expensive day to fly to San Juan is Friday, with ticket prices averaging around $444.

The cheapest time of day to fly to San Juan is in the evening when flights can be purchased for as low as $344. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $453 on average. Flights to San Juan from Washington, D.C. Dulles Intl Airport in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.

Fly from Washington, D.C. Dulles Intl to San Juan Luis Munoz Marin Intl for the best Washington, D.C. Dulles Intl - San Juan flight prices

You are more likely to see cheaper flights to San Juan from Washington, D.C. Dulles Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to San Juan for around $386 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Juan from Washington, D.C. Dulles Intl Airport for as low as $339 on momondo.

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

Delta and United Airlines are the most popular carriers operating from Washington, D.C. Dulles Intl to San Juan

United Airlines, Frontier and Delta are the top three most popular airlines that fly to San Juan from Washington, D.C. Dulles Intl Airport according to our data. United Airlines is the first choice among our users, with 54% 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 20% of flights between Washington, D.C. and San Juan have experienced a delay on any given week. The average delay length over the past 12 months has been 127 minutes.

Generally, flights departing in the morning 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. Sunday has historically seen more delays on average compared to the rest of the week.

According to our data, United Airlines have had the least number of delays on this route over the last 12 months; with about 17% of their flights experiencing any sort of delay.

As of April 2026, 5 flights take off from Washington, D.C. Dulles Intl Airport and land in San Juan each day. The most common flight departure time for this route is 5:00PM, with 61% of daily flights taking off in the afternoon.

As of April 2026, 35 flights take off from Washington, D.C. Dulles Intl Airport and land in San Juan each week. The most common flight departure day for this route is Mon, with 14% of weekly flights taking off on this day.