Air distance from Guam, USA to Nouakchott, Mauritania is 9878.3 Miles (15897.5 Kilometers / 8578.3 Nautical Miles).
Flight duration time from Guam to Nouakchott is 20 hrs, 30 mins. This is the In-The-Air flight time. You should also add the taxi time, airport wait times and possible delays due to bad weather, etc. for the total flight duration time.