The cheapest days to fly Air France are Tuesdays and Wednesdays, as well as sometimes Saturdays, due to lower travel demand. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK) These off-peak days often see lower fares and new sales released, though prices can change rapidly. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK) For the best results, compare fares using a calendar view on flight sites and consider booking several weeks in advance.