Cheap flights from Washington, D.C. Dulles Intl Airport to Lisbon from $355

In general, January is the cheapest month to fly from Washington, D.C. Dulles Intl Airport to Lisbon. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $663. If you are unable to visit Lisbon during the month of January, then departing from Washington, D.C. Dulles Intl Airport during the month February is also very affordable. Most momondo users find prices during this month for around $749.

Our data shows that Monday is the least expensive day to fly to Lisbon. Tickets to fly out on this day can be as low as $721. When flying out on a Friday, the most expensive travel day of the week, you can expect to see flight prices from Washington, D.C. Dulles Intl Airport to Lisbon for around $880.

The cheapest time of day to fly to Lisbon is in the afternoon when flights can be purchased for as low as $742. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are $826 on average. Flights to Lisbon from Washington, D.C. Dulles Intl Airport in the evening are generally more expensive because this time of day is more convenient for travelers’ schedules.

Fly from Washington, D.C. Dulles Intl to Lisbon Humberto Delgado for the best Washington, D.C. Dulles Intl - Lisbon Humberto Delgado flight prices

You are more likely to see cheaper flights to Lisbon from Washington, D.C. Dulles Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Lisbon for around $926 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Lisbon from Washington, D.C. Dulles Intl Airport for as low as $725 on momondo.

There are 3 cabin classes available to choose from on Washington, D.C. Dulles Intl to Lisbon Humberto Delgado flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

No. A direct flight is the cheapest option for a flight between Washington, D.C. Dulles Intl Airport to Lisbon.

As of March 2026, prices for Washington, D.C. Dulles Intl Airport to Lisbon flights are approximately 1% cheaper when compared to flights at the same time last year.

Royal Air Maroc, TAP AIR PORTUGAL, and Icelandair are the most popular carriers operating from Washington, D.C. Dulles Intl to Lisbon Humberto Delgado

TAP AIR PORTUGAL, United Airlines and Royal Air Maroc are the top three most popular airlines that fly to Lisbon from Washington, D.C. Dulles Intl Airport according to our data. TAP AIR PORTUGAL is the first choice among our users, with 78% of people opting to fly with this airline when traveling to Lisbon. Keep in mind that there are 10 different airlines that fly to Lisbon on a routine basis, so you have a few additional options to choose from.

Historically, on average around 28% of flights between Washington, D.C. and Lisbon have experienced a delay on any given week. The average delay length over the past 12 months has been 145 minutes.

Generally, flights departing in the evening tend to experience fewer delays. Flights in the morning have, in the past, seen delays more frequently in comparison.

Saturday is statistically the day of the week which experiences the fewest number of delays on this flight route. Friday has historically seen more delays on average compared to the rest of the week.

According to our data, TAP AIR PORTUGAL have had the least number of delays on this route over the last 12 months; with about 26% of their flights experiencing any sort of delay.

Casablanca (CMN) was the most common stop: 35% of momondo users choosing 1-stop flights on this route connected there.

Flights via New York (JFK) offer the lowest average round-trip price of $454.

Flights connecting via Casablanca (CMN) have the shortest average one-way travel time: 11h 52m.

Istanbul (IST) has the shortest average layover time for this route: 5h 41m.

1 flights are operational daily from Washington, D.C. Dulles Intl Airport to Lisbon as of March 2026. The most popular departure time for this route is 11:00PM, with 100% of flights per day taking off in the evening.

As of March 2026, 13 flights take off from Washington, D.C. Dulles Intl Airport and land in Lisbon each week. The most common flight departure day for this route is Wed, with 38% of weekly flights taking off on this day.