When planning an overseas trip, you’re often confronted with serious sticker shock when pricing a simple round-trip airline ticket.

A number of airlines offer little-known stopover programs that can help you save money while seeing another destination.

TAP Air Portugal offers free stopovers when traveling through Lisbon.

Changing planes in Istanbul? Turkish Airlines gives you up to two days, including a hotel stay, in Istanbul.

Qatar Airways offers a similar deal in Doha.

And if you fly Cathay Pacific through Hong Kong, the airline will allow you to schedule your second leg with a stopover lasting as long as three months after your first flight.