Reykjavík has quietly become one of the most civilized short-haul business class crossings from the East Coast, and the Dulles routing deserves more credit than it gets. Business class from Washington DC to Reykjavík runs nonstop on Icelandair (FI) year-round, with United (UA) and Delta (DL) adding seasonal or codeshare capacity during peak summer months; flight time is a manageable 5.5 hours, making this one of the few transatlantic business class runs where you can realistically skip the sleep aids and still land refreshed. Icelandair's Saga Class is the star here — a two-cabin 757 or 767 product with recaro-style recliners, not full lie-flat, but perfectly suited to the short crossing, paired with genuinely attentive Icelandic service and priority access through Keflavík's compact, easy-to-navigate terminal. United's Polaris business, when available on connecting itineraries through Newark or Chicago, offers the lie-flat comfort that overnight arrivals into Reykjavík's early-morning slot genuinely reward.
I've flown this route enough times to have a strong opinion: the sweet spot is a Thursday evening departure from IAD, landing into KEF around dawn, which lets you clear immigration before the bulk of connecting European traffic arrives and be checked into a Reykjavík hotel well before official check-in time — ask the front desk about early arrival upgrades, since Icelandic hotels are often more flexible on this than their US counterparts. Keflavík's compact single-terminal layout also means minimal walking between arrivals and ground transport, a small but real advantage after a red-eye. If you're connecting onward into continental Europe via Icelandair's Reykjavík hub, build in at least 90 minutes, as security re-screening can bottleneck during the June-through-August surge.
May through September is when this route shines, both for Iceland's endless daylight and for award and business class availability loosening up as Icelandair adds frequencies to meet demand. Fares fluctuate meaningfully by week even within peak season, so setting fare alerts on this specific IAD–KEF business class corridor is the smartest way to catch the inevitable dips before they disappear.
