Kodaline guitarist Mark Prendergast has said the idea of breaking America wasn't important to the Irish band because it seemed so unrealistic.
The High Hopes hitmaker told Bang Showbiz that there was a change of heart when they went on tour.
He said: "But when we started touring over there, you kind of fall in love with it, you're in a different state and city every night. We only found out we got American Idol about two weeks before, so we were already in America, it was a huge deal.
"It got our name out there a lot more. Our Twitter followers definitely went up, [the show] went out to about 15 million people."