How do the people in the tv show lost get saved?

they get saved 2 times. the first is when Charles widmores frieghter is near the island and the ocianic 6 are rescued and flown off the island. the second time is when a second plane crash/lands on the island and they fly it off after a few weeks

One popular theory is they never are physically saved from the island. Instead they are saved spiritually and the island was a test of who was a "good person" and who was a "bad person". The island was sort of a test for redemption of the evils they committed in their life.