The cheapest times to fly from IAD to SJU are

  • January 8th to March 18th
  • April 16th to April 29th
  • August 27th to November 18th

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from IAD to SJU is mid February. Prices can be as high as $995 for Sunday flights during late December, or as low as $311 for Tuesday flights around mid February.


When to Fly to San Juan

Flying from Washington, DC (IAD) to San Juan, PR (SJU) will usually cost between $321 to $716 per person if booking more than four weeks in advance. On average the very cheapest time to fly is mid February with an average ticket price of $337. Due to high demand the most expensive time to fly is late December, with an average price of $732. Planning your trip to low-cost times can easily save you $395 on economy flights and even more on first-class flights. Generally, any price below $438 can be considered a good price for a round-trip IAD to SJU flight.

See below for a graph of average weekly prices for the IAD to SJU route. All prices are for round-trip tickets in USD.

IAD to SJU Flight Prices

Compared to other flights, the IAD to SJU flight is much cheaper than the average and costs much less than the average flight leaving from Washington. The average price per mile (for a direct flight) is $0.17, which is below average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to depart and return on this flight. Sundays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $185 (31%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $395. Return trip prices are from the SJU to IAD flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from IAD to SJU can generally find a 0-layover flight. Because there is a direct flight option the real-world direct flight time of 3 hour 49 minutes may be realistic.


Flight Questions Answered

Still have questions about flying from IAD to SJU? We’ve got answers.

Which airlines fly this route?

You can find 9 major airlines flying this route most often: American, Cape Air, Delta, Frontier, Seaborne Airlines, Silver Airways, Southwest, Sun Country Airlines, United, and potentially more during busy seasons.

How far away is it from Luis Munoz Marin International Airport to Washington Dulles International Airport?

The distance between the two airports is roughly 1574 miles or 2533 kilometers.

How long does it take to fly from IAD to SJU?

The real-world flight time for a nonstop IAD to SJU flight is about 3 hour 49 minutes.

How many flights go between Washington, DC and San Juan, PR?

It depends on the day of the week and the date, but a typical day might have around 52 available flights from IAD to SJU.


Airport Location Info


Departing Airport

Origination codeIAD
Origination airport nameWashington Dulles International Airport
CityWashington, DC
Countrythe United States

Return Airport

Destination codeSJU
Destination airport nameLuis Munoz Marin International Airport
CitySan Juan, PR
Countrythe United States


Late and Early Flight Data

Flights from IAD to SJU tend to depart late almost never compared to the average flight. According to our recently updated data, 13% of flights departed 5 or more minutes late, and 13% of flights left 5 or more minutes early. On average you can expect to leave SJU heading for IAD about 1 minutes early. This does significantly impact arrival time, as the average landing time in San Juan, PR is about 1 minutes early. The numbers below show a recent average of take-off times versus the scheduled departure flight:

  • United: 1 minutes early
  • Some airlines not reporting


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.