The cheapest times to fly from IAD to FMA are

  • January 15th to March 18th (except the weeks of February 12th and February 26th)
  • May 14th to July 15th (except the weeks of June 11th, June 18th, and July 2nd)
  • August 27th to November 25th

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 FMA is late January. Prices can be as high as $2488 for Friday flights during late December, or as low as $1261 for Tuesday flights around late January.


When to Fly to Formosa

Flying from Washington, DC (IAD) to Formosa (FMA) will usually cost between $1294 to $1825 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late January with an average ticket price of $1353. Due to high demand the most expensive time to fly is late December, with an average price of $2010. Planning your trip to low-cost times can easily save you $657 on economy flights and even more on first-class flights. Generally, any price below $1424 can be considered a good price for a round-trip IAD to FMA flight.

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

IAD to FMA Flight Prices

Compared to other flights, the IAD to FMA flight is slightly more expensive than the average and costs slightly more than the average flight leaving from Washington. The average price per mile (for a direct flight) is $0.19, which is below average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to depart and return on this flight. Fridays 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 $214 (13%) 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 $1393. Return trip prices are from the FMA 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 FMA can generally find a 2-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 9 hour 23 minutes may not be realistic.


Alternative Nearby Airports

Champion Traveler tells you which airports are nearby and whether tickets might be cheaper alternative airports nearby. Sometimes it’s worth it to fly into a closer airport and then commute to your destination. Remember that there is not usually a nonstop flight from IAD to FMA while comparing.

Destination alternative #1: Silvio Pettirossi International Airport (ASU) in Asuncion

  • 80 miles (129 km) away from FMA
  • Usually 44.57% less expensive than FMA
  • 1-layover flights available

See IAD to ASU flights


Flight Hacking IAD to FMA

Flight hacking is when you book two tickets instead of a layover, sometimes with different airlines. You will need to either bring only a carry-on bag (highly recommended) or leave yourself plenty of time to go through security again. Flight hacking is completely allowed, but airlines don’t always tell you the cheapest way to get from IAD to FMA — but Champion Traveler does!

Hack #1: Buenos Aires (IAD > AEP > FMA)

  • Price for both tickets: $1161
  • Average savings: $263 (18.48%)

See IAD to AEP flights


Flight Questions Answered

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

Which airlines fly this route?

You can find 9 major airlines flying this route most often: Aerolineas Argentinas, Air Canada, American, Avianca, Azul, COPA, Delta, LATAM, United, and potentially more during busy seasons.

How far away is it from Formosa Airport to Washington Dulles International Airport?

The distance between the two airports is roughly 4670 miles or 7516 kilometers.

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

The real-world flight time for a nonstop IAD to FMA flight is about 9 hour 23 minutes.

How many flights go between Washington, DC and Formosa?

It depends on the day of the week and the date, but a typical day might have around 19 available flights from IAD to FMA.


Airport Location Info


Departing Airport

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

Return Airport

Destination codeFMA
Destination airport nameFormosa Airport


Other Resources

Flights to FMA

Flights from FMA

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.