The 53-year-old Englishman, who won just one of 618 events in his European Tour career, qualified for the USPGA Championship by winning the Senior PGA title in May.
"I left London at 12 o'clock on Sunday and got here 2.30 Monday afternoon," Chapman said.
"I lost my clubs, lost my suitcase, so apart from that everything is great!"
Thankfully now reunited with both, the former Tour rules official expanded on exactly what happened.
"I got to Washington fine," said Chapman. "We were due to fly to Charleston at five, then it was delayed until six, then eight, then 10, then 11.
"Then they said 1.20am and eventually at five in the morning they said it's cancelled.
"We had a mad dash over to Ronald Reagan Airport, got a flight to Savannah and got a courtesy car from there - two hours.
"I got something on YouTube on how not to talk to customs from one of the check-in people."
While he might not have been happy about all that, Chapman is certainly glad about the opportunity to mix it with the game's greatest players again.
His last major was the 2002 Open at Muirfield, where he was disqualified in the second round for signing for a wrong score.
Yet he will also be at next June's US Open - courtesy of his victory at the US Senior Open last month for a double worth an incredible £560,000.
"I hadn't thought of being at a USPGA or a US Open, so the only one missing is The Masters. I wonder if there's an invitation - not!"
Asked if he was in the ultimate "nothing to lose" position this week, Chapman replied: "Absolutely - it's not going to ruin my year if I have two bad rounds, is it?
"I'm really looking forward to it. I played it on Xbox with my son Sunday morning, so I got a bit of a feel to it.
"I'm just going to enjoy it. If I make the cut, I make the cut. To be treading the fairways with some of these wonderful young players, it's a real huge lift for me and it's an honour to be here."
With his new-found riches Chapman admits he has his eyes on a top-of-the-range Jaguar, having rejected the idea of an Aston Martin when he realised he could not get his gold bag in the boot.
"It's going to change my life - hopefully. Contracts are on the table now and you are thinking 'Wow'. This is pension time!"