Sit on the Right side of the plane for the best views on flights from London to Lisbon. Left wins at takeoff for the London panorama, but the Lisbon approach on the right is the more dramatic and memorable view of the two — the Tagus estuary, the bridge, and the city on its hills is a genuinely spectacular arrival. For the full flight, right also picks up the Portuguese coastline and the Serra da Estrela foothills during descent. On balance, right side delivers more across the whole journey.

During takeoff from Heathrow (LHR), sit on the Left side for the best views. Heathrow typically departs westbound on runways 27L/27R, then aircraft turn south. The left (east-facing) side picks up central London as the aircraft climbs and banks — the Thames, the City skyline, and the curve of the river through Greenwich are all clearly visible. Right side gets suburban west London and little else of note. Notable sights include: River Thames snaking through central London, City of London and Canary Wharf towers, Windsor Castle and Windsor Great Park to the southwest during the turn, the M25 orbital motorway as a broad grey arc.

When landing at Lisboa (LIS), sit on the Right side for the best views. Lisbon's runway 03 approach (the most common northbound landing) brings aircraft in from the south over the Tagus estuary. The right side faces west and picks up the Tagus river mouth, the 25 de Abril suspension bridge, and the city of Lisbon climbing its hills on the north bank. Left side faces east over flat industrial Setubal peninsula. Notable sights include: Tagus River estuary and its wide mouth opening to the Atlantic, 25 de Abril suspension bridge spanning the Tagus, Lisbon's hillside districts of Alfama and Bairro Alto visible as dense urban terracing, Cristo Rei statue on the south bank near the bridge.

The flight from Heathrow (LHR) to Lisboa (LIS) takes Approximately 2 hours 20 minutes.

The Bay of Biscay is crossed in the first third of the flight — visible as open Atlantic water below. Over northern Spain the Cantabrian Mountains appear as a distinct east-west ridge. The Meseta Central, Spain's high interior plateau, dominates the middle section — flat, brown, and largely featureless at altitude. The Tagus river (Tajo in Spain) can be traced as a thin line crossing the plateau before the Portuguese border. The Serra da Estrela range in central Portugal is the last significant terrain feature before descent into Lisbon.