Cheap flights from Portugal to Washington, D.C. from $374

In general, March is the cheapest month to fly from Portugal to Washington, D.C. Dulles Intl Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $665. If you aren’t able to travel to Washington, D.C. Dulles Intl Airport during the month of March, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $675.

Our data shows that Friday is the least expensive day to fly to Washington, D.C. Dulles Intl Airport. Tickets to fly out on this day can be as low as $900. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from Portugal to Washington, D.C. Dulles Intl Airport for around $1,070.

Flying to Washington, D.C. Dulles Intl Airport from Portugal in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $713 when looking at flights departing in the afternoon. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $979 on average. Flights to Washington, D.C. Dulles Intl Airport from Portugal in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

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

You are more likely to see cheaper flights to Washington, D.C. Dulles Intl Airport from Portugal when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. Dulles Intl Airport for around $796 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. Dulles Intl Airport from Portugal for as low as $668 on momondo.

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

Historically, on average around 29% of flights between Portugal and Washington, D.C. have experienced a delay on any given week. The average delay length over the past 12 months has been 130 minutes.

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

Monday 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, United Airlines 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.

As of October 2026, 3 flights take off from Portugal and land in Washington, D.C. Dulles Intl Airport each day. The most common flight departure time for this route is 12:00PM, with 71% of daily flights taking off in the afternoon.

As of October 2026, there are 23 flights per week flying from Portugal to Washington, D.C. Dulles Intl Airport. The most common day of the week flights depart is Wed, with 30% of flights taking off on this day.