Sit on the Right side of the plane for the best views on flights from Frankfurt to Lisbon. The right side misses the Frankfurt skyline at takeoff but wins decisively on landing with the Tagus estuary and Lisbon approach. During the cruise, the right side also faces south toward the Iberian interior — the Sierra de Guadarrama and the Spanish meseta are more visible on the right as you cross Spain. The Lisbon arrival alone makes right the clear overall choice.

During takeoff from Frankfurt Main (FRA), sit on the Left side for the best views. Frankfurt typically departs westbound on runway 25C/25R, meaning the left side faces south toward the Taunus hills and the Rhine-Main plain. You get a clear view of Frankfurt's skyline receding behind you, with the Main River snaking through the city below. Notable sights include: Frankfurt city skyline and Commerzbank Tower, Main River bends through the city, Taunus hills to the north, Rhine River confluence near Mainz.

When landing at Lisboa (LIS), sit on the Right side for the best views. Lisbon typically lands on runway 03, approaching from the south over the Tagus estuary. The right side gives you the Tagus River mouth, the 25 de Abril Bridge, and the city of Lisbon climbing its hills on the north bank — one of the most dramatic urban approaches in Europe. Notable sights include: Tagus River estuary, 25 de Abril suspension bridge, Cristo Rei statue on the south bank, Lisbon's hilltop districts of Alfama and Castelo.

The flight from Frankfurt Main (FRA) to Lisboa (LIS) takes Approximately 2 hours 45 minutes to 3 hours.

The flight crosses the Pyrenees in the Navarra-Aragon region where individual peaks are visible, then tracks over the Spanish Meseta — a vast flat plateau at around 2,000-3,000 ft elevation with sparse towns and reservoirs. The Sierra de Guadarrama northwest of Madrid appears as a snow-capped ridge in winter months. Crossing into Portugal, the Tagus River valley becomes visible before the descent into Lisbon.