DUBLIN — In one week in July, the Irish rock band Fontaines D.C. went from the Glastonbury Festival to Copenhagen to Barcelona to St. Petersburg to Moscow. At the airport on the way back from that last stop, the frontman, Grian Chatten, wandered off to buy some headphones while the rest of the band got on the plane.

Chatten had to kill the better part of the next 24 hours, waiting for the next flight. He passed the time, he said, by “drinking bad Guinness until it tasted like good Guinness.” In the air, he kept going with plenty of free wine. Eventually, Chatten made it back to Dublin and to his parents ’ house — or “gaff,” as he calls it — where he lives between touring.

Later that day, in an interview with his bandmates at a pub near the studio where they rehearse, Chatten had a rolled cigarette in his hand and a Flann O’Brien novel in his overcoat pocket. He recalled that he was still drunk when his dad came to collect him at Dublin Airport. But the old man wasn’t upset at the boozy state of his son, Chatten said: “He joined in when we got home!”

The vagaries of rock band road life may not pair naturally with filial domesticity, but that’s just where Fontaines D.C. is at right now.