Ryanair is to start flights in September between Castellon airport in Spain and Britain in the first regular commercial flights to operate from the "ghost" airport since it opened in 2011.
Castellon airport is on Spain's eastern Mediterranean coast some 70 km north of Valencia.
It was built at a cost of €150m during the country's building bonanza which ended in a 2008 crash and a bailout of its banking system.
The airport was the pet project of local People's Party (PP) politician, Carlos Fabra, who is now serving time in jail for tax fraud.
It became a symbol of how Spain's regional governments rashly spent billions on grand projects in the boom years.
Ryanair will start selling the flights on Friday, and it said it has the capacity to bring 60,000 passengers a year to Castellon on five flights per week from London Stanstead and Bristol.
Castellon is the 24th airport in Spain to carry Ryanair flights. Ryanair handled nearly 32 million passengers in Spain last year, more than any other airline, official data shows.
The Castellon authorities hope the flights will boost tourism to the coastal area north of Valencia. Tourism accounts for over 10% of Spain's economic output.