$421 Cheap Flights from Washington (IAD) to Lisbon (LIS)

You can find cheap one-way flights from $421 and cheap return flights from $679 Washington, DC (IAD-Washington Dulles Intl.) to Lisbon (LIS-Humberto Delgado) with Expedia. One-way flights typically cost between $626 and $7560, and return flights often range between $1009 and $6050. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Washington, DC (IAD-Washington Dulles Intl.) to Lisbon (LIS-Humberto Delgado) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.

October is the cheapest month to fly from Washington, DC (IAD) to Lisbon (LIS), with average round-trip fares around $990. This price is about 14% lower than the average fare throughout the year, likely due to reduced travel demand after the summer peak. Other budget-friendly months for this route include September and November.*Averages based on flights available on Expedia in the last year.

There are 2 airlines offering direct flights from IAD to LIS:

• TAP Portugal operates around 10 direct flights from IAD to LIS every week
• United operates around 7 direct flights from IAD to LIS every week

Royal Air Maroc is one of the cheapest airlines offering connecting flights from Washington, DC (IAD) to Lisbon (LIS), with round-trip tickets starting from around $948. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.

For your journey from Washington, DC (IAD) to Lisbon (LIS), October and September are the best months to fly. During these months, return flights average around $990, providing a good balance of price and travel experience. September offers warm weather and vibrant city life, while October sees fewer tourists, allowing for a more relaxed visit.*Prices based on flights available on Expedia in the last year.

Business class seats are offered on the IAD to LIS route. Airlines that offer business class service on this route include:

• British Airways
• Air France
• Iberia
• United Airlines
• TAP Portugal
• Turkish Airlines
• Lufthansa
• KLM
• Swiss International Air Lines
• Air Canada

First class cabins are available on:

• Lufthansa
• Swiss International Air Lines
• United Airlines

A direct, return business class ticket from Washington, DC (IAD) to Lisbon (LIS) typically costs between $6,529 - $9,237. A non-stop, one-way business class flight is usually around $4,292 - $7,051. Prices often fluctuate based on seasonality and how early you book. You may also be able to find a cheaper business class journey between Washington, DC (IAD-Washington Dulles Intl.) to Lisbon (LIS-Humberto Delgado) if you opt for a connecting flight.*Prices based on flights available on Expedia in the last year.

It's easy to earn miles on a Washington, DC (IAD-Washington Dulles Intl.) to Lisbon (LIS-Humberto Delgado) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.