Conclusion: fly into Fiumicino (FCO) unless you're on Ryanair or Wizz Air. ① FCO is Rome's main international hub — a record 50+ million passengers in 2025 — and the only one with a train station inside the airport; Ciampino (CIA) handled about 3.9 million and serves almost only low-cost carriers. ② Distance: FCO is ~32 km west of the centre, CIA just ~12 km south-east. ③ Getting in: FCO's Leonardo Express reaches Roma Termini in 32 minutes for €14; CIA has no rail link, so it's the Terravision bus (~40 min, from €6) or a taxi. ④ Fixed taxi fares: €55 from FCO to inside the Aurelian Walls, €40 from CIA. ⑤ Pick FCO for long-haul or the train; pick CIA for cheap short European hops with light luggage.