United Airlines will operate seasonal service on the Washington Dulles – Keflavik route commencing on 21 May 2026. The Boeing 757-200 service will operate daily offering Business Class and Economy Class cabins and will operate to the following schedule:

UA398 Washington Dulles 2255 – Keflavik 0850+1
UA399 Keflavik 1130 – Washington Dulles 1355

The route can be used as part of all Star Alliance Round The World ticket.