Every Washington–Porto fare we track, measured against the route's typical price whenever there is enough cached history to build one. Subscribe in any RSS reader for free single-route price alerts — no account, no email needed.https://flight.dealsen-ushttps://flight.deals/flights/washington-to-porto/#2027-06-02-2027-06-16-TPhttps://flight.deals/flights/washington-to-porto/#2027-06-02-2027-06-16-TPWAS → OPO round-trip on TAP Air Portugal, 2027-06-02 to 2027-06-16 (14 nights). Cached fare $499. Not enough cached history on this route yet to say what it usually costs.Tue, 01 Sep 2026 12:09:07 GMT