Want to turn a layover into a trip? These 8 stopover programs can help.

Iberia, the flag carrier of Spain, advertises the chance to explore the country’s capital city with the Stopover Hola Madrid program. First, select a route that stops in Madrid; next, you can select up to six nights to stay; then book and browse discounted offers available to stopover customers, including tours, food and transportation. The stopover can be selected for the outbound or return flight. While the airline website says the program is available on most routes, you may need to play with dates to find flights with stopover availability.