Gateway Airport in Boise offers no shortcut to Reykjavík, and that's precisely what makes the routing decision so interesting for seasoned travelers. There is no nonstop business class from Boise to Reykjavík; instead, the practical options funnel through Seattle or Salt Lake City on Delta, through Denver, Chicago, or Newark on United, or via a connection to a larger East Coast gateway before catching Icelandair's seasonal or year-round nonstop into Keflavík. Delta's transatlantic partnership positions it well for connections onward from its hubs, often putting travelers into Delta One suites with sliding doors on widebody aircraft for the long-haul segment, while United routes typically funnel through Newark or Chicago on its Polaris business product, complete with Saks Fifth Avenue-designed bedding and lie-flat seating. Icelandair itself doesn't operate a true suite-style business cabin, but its Saga Class offers a comfortable, understated experience with extra legroom, priority boarding, and lounge access — a fitting complement to the airline's efficiency-focused ethos.
Having flown this connection pattern repeatedly, my strongest recommendation is to route through Seattle on Delta whenever schedules allow: the westward positioning minimizes backtracking, and Delta's SEA lounge makes for a far more relaxing layover than the crowded Denver or Newark alternatives on United. If Icelandair factors into your itinerary, arrive into Keflavík with a buffer — the airport's compact size is deceiving during the June-through-August peak season when tour groups descend en masse, and immigration lines can stretch longer than the terminal's footprint suggests.
Late spring through early autumn remains the sweet spot for this itinerary, both for Iceland's extended daylight and for business class award and fare availability, as airlines add capacity to meet peak Icelandic tourism demand. Because routing complexity from Boise means fares fluctuate based on which connecting hub and carrier combination opens up seat inventory, this is a route where setting continuous fare alerts pays real dividends — the difference between a mediocre connection and a genuinely comfortable one often comes down to catching the right release window.
