Route
LHR - LIS is the first comparison, but nearby UK departure airports can shift the total.

Europe
Lisbon, Porto, and Algarve breaks need hotel-area and airport-transfer checks before the cheapest fare wins.
Planning board
LHR - LIS is the first comparison, but nearby UK departure airports can shift the total.
City hills, riverside bases, and beach stays
Shoulder-season weekends are strongest
Nearby country boards
Paris, Nice, Lyon, and ski-season add-ons work best when airport-to-centre timing stays visible.
Barcelona, Madrid, Malaga, and the islands suit short UK breaks when transfer time and baggage rules are compared early.
Rome, Milan, Venice, and Naples work well as open-jaw trips when the first hotel night is planned around arrival.
Greece trips work best when Athens timing, island transfers, and hotel check-in windows are planned together.