This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $677 fare is the cheapest current round-trip from Seattle (SEA) to WAW on United Airlines flight UA9413, departing 2026-08-11 at 18:50 with return on 2026-08-25.

Clicking "Book this flight" opens Kiwi.com with this exact flight pre-filtered — same airline, same dates, same passenger count.