A layover at ICN.

LYVR shows live security wait times for each checkpoint, grouped by terminal, refreshed every couple of minutes.

LYVR lists 6 lounges at ICN, 5 of them on Priority Pass. Which ones you can get into depends on your ticket, airline status, credit card or a lounge membership. Each lounge on this page lists what gets you in, and LYVR checks it against your own profile.

Yes, at 2 lounges: Korean Air Lounge (International - Concourse A) (Korean Air Morning Calm Select and up, SkyTeam Elite Plus); Asiana Business Lounge Central (Asiana Airlines Diamond and up, Star Alliance Gold). Status entry needs a same-day departing flight on that airline or its alliance, and some tiers only count on international flights.

It depends on your terminals, whether you re-clear security or customs, and how far the gates are apart. LYVR adds up deplaning, every walk on the indoor map, any checkpoints your connection passes and the boarding door time, then shows exactly how much time you have to spare.

For a connection on one ticket, airlines won't sell you less than ICN's minimum connection time, and they rebook you if a delay makes you miss it. An international transfer with security screening is still more comfortable with 1.5 to 2 hours, and separate tickets need 3 or more. LYVR works out your exact time to spare for your own two gates.

With an hour or two, eat near your gate and walk the terminal. With more, ICN's 6 lounges (5 on Priority Pass) have quiet seats, food and often showers. LYVR's Explore tab lists every restaurant, bar and shop near your gate with the walk time, so you only see what fits in your layover.

On a domestic connection, yes, with enough time. On an international one, only if you're allowed to enter South Korea, since leaving ICN means going through immigration, and you'd want about 6 hours: the passport line both ways, the trip into Seoul and back, and security on the way in. LYVR checks the ride each way, the time you'd have in the city and your passport's entry rule.