I was checking flights for a guest and I thought that a list of low-cost (seasonal or year-round) flights to the nearest airports from different places in Europe would be useful.
So, here it goes!

To RIMINI (1.10 hour drive to the Locanda)

Berlin Tegel TXL Airberlin
Köln/Bonn CGN TUIfly
Hannover HAY TUIfly
München MUC TUIfly
Stuttgart STR TUIfly
Stockholm S. Skavsta NYO Ryanair
Bristol BRS Ryanair
London Stansted STN Ryanair
Nottingham East-Midlands EMA Ryanair

To ANCONA(1.10 hour drive)

Weeze (Düsseldorf) NRN Ryanair
London Stansted STN Ryanair

To BOLOGNA (FORLÌ) (1.40 hour drive)

Brussels Intl. BRU Windjet
Prague PRG Windjet
Paris CDG Windjet
Berlin Tegel TXL Windjet
Riga RIX Windjet
Amsterdam AMS Windjet
Krakow KRK Windjet
Bucharest Otopeni OTP Windjet
Timisoara TSR Windjet
Moscow Domodedovo DME Windjet
St. Petersburg LED Windjet
Barcelona BCN Windjet

To BOLOGNA (2 hours drive)

Brussels Charleroi CRL Ryanair
Brussels Intl. BRU Brussels Airlines
Prague PRG click4sky
Paris Beauvais BVA Ryanair
Paris CDG Myair
Berlin Schönefeld SXF Germanwings
Köln/Bonn CGN Germanwings
Frankfurt Hanh HHN Ryanair
Weeze (Düsseldorf) NRN Ryanair
Reykjavik – Keflavik KEF Iceland Express
Dublin DUB Air Lingus or Ryanair
Oslo Torp TRF Ryanair
Katowice KTW Ryanair or WizzAir
Warsaw WAW WizzAir
Fuerteventura FUE Meridiana
Girona GRO Ryanair
Granada GRX Ryanair
Palma de Mallorca PMI Germanwings
Valencia VLC Ryanair
Birmingham BHX Ryanair
Edinburgh EDI Ryanair
London Stansted STN Ryanair

Of course if you want to go green and you have the time you can reach Pesaro by train from almost everywhere in Europe!