Originally Posted by
TWA884
According to my step tracker, it was a full mile to walk from gate A20, via immigration, customs and TSA security, to the PHL Chase Sapphire Lounge.
That sounds right, it's basically 1.5 miles from the furthest A gate to the furthest F gate airside at PHL. I've done it several times during long connections to get steps in (also tracked it with my step tracker).