The cheapest times to fly from IAD to LIS are

  • January 22nd to February 4th
  • May 7th to July 15th
  • August 27th to December 9th (except the weeks of October 29th and November 19th)

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 LIS is early to mid May. Prices can be as high as $1239 for Saturday flights during mid December, or as low as $557 for Thursday flights around early to mid May.


When to Fly to Lisbon

Flying from Washington, DC (IAD) to Lisbon (LIS) will usually cost between $560 to $905 per person if booking more than four weeks in advance. On average the very cheapest time to fly is early to mid May with an average ticket price of $569. Due to high demand the most expensive time to fly is mid December, with an average price of $979. Planning your trip to low-cost times can easily save you $409 on economy flights and even more on first-class flights. Generally, any price below $592 can be considered a good price for a round-trip IAD to LIS flight.

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

IAD to LIS Flight Prices

Compared to other flights, the IAD to LIS flight is 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 $0.1, which is far below average.


Flight Prices by Day of the Week

Thursday is usually the cheapest day to fly to LIS, and Monday the cheapest day to fly back into IAD. Saturdays 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 $86 (12%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Thursday and returning a week later will cost an average of $611. Return trip prices are from the LIS 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 LIS can generally find a 0-layover flight. Because there is a direct flight option the real-world direct flight time of 7 hour 26 minutes may be realistic.


Flight Questions Answered

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

Which airlines fly this route?

You can find 26 major airlines flying this route most often: Aer Lingus, Aeroflot, Air Canada, Air Europa, Air France, Air India, Alitalia, American, Austrian, British Airways, Brussels Airlines, Delta, Finnair, Iberia, KLM, Lufthansa, Royal Air Maroc, SAS, Singapore Airlines, SWISS, TACV, Tap Air Portugal, THAI, Turkish Airlines, United, Virgin Atlantic, and potentially more during busy seasons.

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

The distance between the two airports is roughly 3582 miles or 5765 kilometers.

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

The real-world flight time for a nonstop IAD to LIS flight is about 7 hour 26 minutes.

How many flights go between Washington, DC and Lisbon?

It depends on the day of the week and the date, but a typical day might have around 76 available flights from IAD to LIS.


Airport Location Info


Departing Airport

Origination code IAD
Origination airport name Washington Dulles International Airport
City Washington, DC
Country the United States
Latitude 38.9
Longitude -77.5

Return Airport

Destination code LIS
Destination airport name Lisboa Airport
City Lisbon
Country Portugal
Latitude 38.8
Longitude -9.1


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.