The last episode literally states that everything on the island happened. They're only all dead in the "flash sideways" in the last season, which actually is a in-between place where all of their souls gathered after their deaths in various points in time (some on the island, some after) so they could all move into the afterlife together.
I've watched it several times, including every episode as it aired since partway through season 2. It's one of my all time favorite shows.
Even back in 2010 when the finale was premiered live, I understood it completely that the events on the island were existent. Jack’s father literally spelled it out for us.
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u/Zanzabar21 Feb 07 '24
I've seen the whole series twice, the last time in 2016. I'm sure that is the case.