The closest airport to Illescas is Adolfo Suárez Madrid–Barajas Airport, which is located about 50 kilometres from Illescas. If you're looking to travel internationally, Madrid Airport is served by a number of airlines including Air Europa, Iberia, and Vueling.
If you're looking to travel within Spain, there are a number of regional airports that serve Illescas. The closest airport is Toledo Airport, which is located about 20 kilometres from Illescas. This airport is served by Ryanair.