Spanish carrier Vueling will emerge as an airline serving 43 cities, including its six bases, once the merger with Clickair is formally completed on 9 July.
Vueling's bases will be located at Madrid, Barcelona, Seville, Bilbao, Valencia and Malaga and the carrier will serve 12 other Spanish destinations - including the Canary Islands.
It will operate to seven Italian cities plus Paris, London, Amsterdam, Brussels, Lisbon, Vienna, Athens, Nice and Malta.
The network will also include seven destinations in Eastern Europe - including the Russian cities of Moscow and St Petersburg - and two Moroccan cities.
Vueling says the carriers will overlap on 17 routes - the equivalent of 21% of capacity - but chief executive Alex Cruz says this spare capacity will be used to strengthen weak routes and launch new services.
Cruz says 70% of Vueling's passengers will be leisure travellers, and 30% business.
Spanish flag-carrier Iberia will hold 45.85% of Vueling, which will combine the current Vueling fleet of 17 Airbus A320s with Clickair's 18.