The England international has been an ever-present for Leeds since joining on loan from Stoke City in February.
Butland's time at the club has coincided with a dreadful run of form, and as a result, Butland has conceded 26 goals in 14 matches.
But recent clean sheets against Blackpool and Barnsley – wins that secured the club's place in the Championship next season – have boosted Butland's confidence.
Butland told United's official website: "We have been on a tough run and conceded a lot of goals.
"So, it has been good to get a couple of clean sheets in the last two weeks.
"We had been at a stage where every mistake we made ended up in a goal, but thankfully things have come together a bit more in the last couple of weeks.
"The spell has had a few ups and downs but what hasn't changed is the experience I am getting of playing for a big club.
"There is a lot of expectation that comes with playing in front of big crowds.
"Yes, it has been tough and we haven't picked up enough points, but it has been something that has taught me a lot and it will help me moving forward."
