$409 Cheap TAP Portugal flights Washington (IAD) to Lisbon (LIS)

Finding cheap one-way TAP Portugal flights from IAD to LIS from $409 on Expedia is a breeze --- just filter by "Price (lowest to highest)." Or check out our budget-friendly round-trip fares from $529 for your next break.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

Start your search for TAP Portugal flights from IAD to LIS about one month before you want to leave. The cheapest time to reserve an international flight is usually 18 to 29 days ahead of your departure date when you can save 17% versus booking four to five months in advance. Regardless of ticket type or itinerary, the best day to book international airfare is usually Sunday. Friday is often the most expensive. Travelers who book on a Sunday can save 17% on average compared to those who book on a Friday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.

Departing IAD at 5:30PM UTC-5, the earliest TAP Portugal flight to LIS lands at 5:35AM UTC+0. Traveling early means you're less likely to experience delays.* Prefer to travel later? The last TAP Portugal flight from IAD to LIS departs at 10:30PM UTC-5 and touches down at 10:35AM UTC+0.*Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.