Sit on the Left side of the plane for the best views on flights from Boston to Keflavik. The left seat wins overall because the Boston departure views are significantly more dramatic and varied than the arrival side difference at KEF. Mid-flight over the North Atlantic both sides are equally featureless ocean, so the departure experience tips the balance. If you reverse the priority and care more about the Iceland arrival, right is worth considering.

During takeoff from General Edward Lawrence Logan International (BOS), sit on the Left side for the best views. Logan's dominant departure runway for transatlantic flights is 33L/33R heading northwest, then routing northeast. A left seat gives you Boston Harbor, the downtown skyline, and the Charles River basin as you climb out over the city. Right seats face the open Atlantic with little of interest at low altitude. Notable sights include: Boston Harbor and its islands, downtown Boston skyline including the Prudential and Hancock towers, Charles River and Cambridge, Cape Ann coastline to the north.

When landing at Keflavik Nas (KEF), sit on the Right side for the best views. KEF typically uses runways 28 or 10 depending on wind, but the dominant approach for transatlantic arrivals from the east is runway 28, approaching from the east over the Reykjanes Peninsula. A right seat faces south toward the rugged lava fields of the peninsula and the Atlantic coastline, with the Blue Lagoon geothermal area visible as a pale turquoise pool amid dark basalt. Left seats look north toward Faxaflói Bay. Notable sights include: Blue Lagoon geothermal pool amid Reykjanes lava fields, Reykjanes Peninsula coastline and Atlantic surf, Faxaflói Bay to the north, volcanic lava field terrain of the peninsula.

The flight from General Edward Lawrence Logan International (BOS) to Keflavik Nas (KEF) takes Approximately 5 hours 30 minutes to 6 hours 15 minutes westerly winds dependent.

The great circle route tracks northeast from Boston, crossing Nova Scotia and the Gulf of St. Lawrence, then over southern Greenland's ice sheet edge near Cape Farewell, across the Denmark Strait, and descending toward Iceland. The Greenland ice cap edge is the single most dramatic mid-flight feature — a sharp boundary between dark ocean and brilliant white ice visible from cruising altitude on clear days. The Denmark Strait between Greenland and Iceland is typically cloud-covered but occasionally shows sea ice in winter months.