You land CDG at 16:00; allow 60–90 minutes for passport control and baggage if checked. You're connecting same evening to Barcelona, so stay airside or transfer to the departure terminal quickly.
Grab a coffee or lounge pass near your departure gate — best to relax and check-in for the AF/partner flight to BCN; many cafés in Terminals 2 open late (lounges often by membership).
Book a timed-entry ticket for mid-morning (Sagrada Família typically open 9:00–18:00); this is Gaudí's masterpiece and essential for first-time visitors.
A relaxed morning activity: Montjuïc offers panoramic views (cable car operates ~10:00–18:00 depending on season) or a beach stroll if weather is good.
Allow at least 90 minutes to 2 hours for transfer and check-in for international flights; confirm which airport (FCO or CIA) your Antibes-bound flight uses.
Fly to the French Riviera (Antibes/Nice). On arrival, pick up rental car in Antibes and check into your Antibes hotel — many rental desks open late but confirm pickup hours.
Return rental at the small St-Tropez airport (LTT/La Môle) before your early flight — confirm rental desk opening time in advance (many open early for scheduled flights).
Take your early morning flight to Paris (likely to Orly or CDG); arrive in the morning and transfer to your Paris hotel to drop bags (hotel check-in may be later, request early drop).
Take RER C from central Paris to Versailles Château Rive Gauche (journey ~40–50 min). Trains run regularly; check schedules and aim to arrive mid-afternoon because the Château closes earlier than many evening events.
Important: Palace of Versailles typically closes around 6:30pm (hours vary seasonally) — full palace tours aren't possible late into the night; plan late-afternoon entry to see the State Apartments and Hall of Mirrors. Check official hours the day before as they change seasonally.