Is 1hr and 35 min enough time to make your connection flight in frankfurt airport?

More than enough time. 3 hours is plenty of time at any airport, but even more so at Incheon Airport. I've connected through Seoul a few times and Incheon is one of easiest and nicest airports to connect through, not only will you have enough time, you'll have ample time to have a meal and do some duty-free shopping with the extra time you'll have.

More than enough. Incheon airport is like a huge shopping mall with an airport attached.

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