Eastar Jet serves busy domestic routes that tie directly into Seoul’s public-transport network, so missed connections are a common practical risk for itinerary planners. As a low-cost carrier (LCC) some fare components—checked baggage, seat selection, changes—are separated from the base fare, which affects total travel time at airports and transfer choices. Below I present who benefits from specific Eastar Jet routings, step-by-step public transport links, a timed itinerary for a day trip to Jeju or a regional one-way, booking logistics and seasonal cautions with official links checked for accuracy.