Cheap flights from Washington, D.C. to San Juan from $115

If you’re not able to fly to San Juan in August, then November is your next best option. Flight prices from Washington, D.C. to San Juan during November average around $315.

The cheapest day to depart from Washington, D.C. to San Juan is on a Sunday when prices can be found for as low as $371. The most expensive day to fly to San Juan is Friday, with ticket prices averaging around $449.

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 $459 on average. Flights to San Juan from Washington, D.C. in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.

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

You are more likely to see cheaper flights to San Juan from Washington, D.C. when booking weeks ahead of your departure date. In general, you can expect to find flights to San Juan for around $394 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. for as low as $335 on momondo.

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

Frontier, Spirit Airlines and United Airlines are the top three most popular airlines that fly to San Juan from Washington, D.C. according to our data. Frontier is the first choice among our users, with 36% of people opting to fly with this airline when traveling to San Juan. Keep in mind that there are 7 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 136 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 May 2026, 7 flights take off from Washington, D.C. and land in San Juan each day. The most common flight departure time for this route is 8:00AM, with 47% of daily flights taking off at noon.

As of May 2026, 51 flights take off from Washington, D.C. and land in San Juan each week. The most common flight departure day for this route is Mon, with 18% of weekly flights taking off on this day.