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United Airlines and Expedia have round trip airfares travelling from Washington DC (IAD) to Lisbon Portugal (LIS) for $ 350, making 1 stop. These are basic economy fares, a restricted-type fare that allows 1 personal item and 1 free carry-on bag. There is no seat select or ticket changes.

Travel Availability:[INDENT]Departs IAD: Dec 1-3, 7-8; Jan 10-11, 14-15, 17-21, 24-28, 31; Feb 1-4, 7-11, 14-17, 21-24, 28; March 1-2, 7-9, 28; April 5-6, 11, 13, 15, 20
Returns: wide and great availability returns Monday-Friday