Sit on the Right side of the plane for the best views on flights from Boston to Madrid. The Sierra de Guadarrama on approach into Madrid is a genuinely dramatic payoff, and the right seat also captures the Greenland ice sheet and southern tip of Greenland during the transatlantic cruise if you are awake for it. The left seat at Boston departure is good, but the right seat delivers more across the full flight.

During takeoff from General Edward Lawrence Logan International (BOS), sit on the Left side for the best views. Logan's primary eastward departures on Runway 33L/22R swing the aircraft northward over Boston Harbor and the city. A left seat gives you the downtown Boston skyline, the Charles River, and a clear look back at the harbor islands as you climb out. Right side faces the open Atlantic with little to see. Notable sights include: Downtown Boston skyline, Boston Harbor and Harbor Islands, Charles River and Cambridge, Fenway Park district.

When landing at Barajas (MAD), sit on the Right side for the best views. Madrid Barajas typically receives transatlantic arrivals from the north or northeast, with approaches on Runway 32L/32R heading southeast. A right seat on approach gives you views over the Sierra de Guadarrama mountain range to the west and northwest, and then the city of Madrid spreading across the Castilian plateau as you descend. Left side faces open flat meseta with less visual interest. Notable sights include: Sierra de Guadarrama mountain range, Madrid city center and Gran Via corridor, Manzanares River valley, Castilian meseta plateau.

The flight from General Edward Lawrence Logan International (BOS) to Barajas (MAD) takes Approximately 7 hours 30 minutes to 8 hours.

The flight tracks northeast out of Boston over Nova Scotia, then across the North Atlantic on a great circle route passing south of Greenland — the ice cap and coastal fjords of southern Greenland are visible on clear days from both sides at cruise altitude. The route then crosses over Ireland and northern Spain, with the Cantabrian Mountains visible before descending toward the Castilian plateau and Madrid.