On 19 June 2015, Lonergan returned to the Championship, signing for Fulham on a two-year deal with a one-year extension option after his release from Bolton Wanderers.
He was allocated the number 24 shirt.

Lonergan made his Fulham debut, making his first start, in the opening game of the season, in a 1–1 draw against Cardiff City.
After Marcus Bettinelli suffered an injury in a game against Hull City on 20 August 2015 and was stretched off in the 45th minutes, Lonergan came on as a substitute after Marcus Bettinelli collided with Matt Smith and Fulham went on to lose 2–1.
In a 2–1 win over Blackburn Rovers on 13 September 2015, Lonergan was named the Man of the Match following a string of impressive saves.
He became the first choice goalkeeper for the club until he suffered a hamstring injury, sustained during a 2–1 loss against Bristol City on 31 October 2015, and was out for six weeks.
Lonergan made his first team return on 12 December 2015, in a 2–2 draw against Brentford and despite a draw, he was once again named Man of the Match for his impressive display and again for the third time, in a 1–0 loss against Sheffield Wednesday on 4 January 2016.
Lonergan remained the first choice goalkeeper until Bettinelli returned from injury and he was placed on the substitute bench for the rest of the season.
On 19 June 2015, Lonergan returned to the Championship, signing for Fulham on a two-year deal with a one-year extension option after his release from Bolton Wanderers. He was allocated the number 24 shirt.
Lonergan made his Fulham debut, making his first start, in the opening game of the season, in a 1–1 draw against Cardiff City. After Marcus Bettinelli suffered an injury in a game against Hull City on 20 August 2015 and was stretched off in the 45th minutes, Lonergan came on as a substitute after Marcus Bettinelli collided with Matt Smith and Fulham went on to lose 2–1. In a 2–1 win over Blackburn Rovers on 13 September 2015, Lonergan was named the Man of the Match following a string of impressive saves. He became the first choice goalkeeper for the club until he suffered a hamstring injury, sustained during a 2–1 loss against Bristol City on 31 October 2015, and was out for six weeks. Lonergan made his first team return on 12 December 2015, in a 2–2 draw against Brentford and despite a draw, he was once again named Man of the Match for his impressive display and again for the third time, in a 1–0 loss against Sheffield Wednesday on 4 January 2016. Lonergan remained the first choice goalkeeper until Bettinelli returned from injury and he was placed on the substitute bench for the rest of the season.
Andy Lonergan