Seven days in Korea answers itself: four nights in Seoul, the KTX south (2.5 hours, about ₩57,000), and two or three nights in Busan, flying home from either end if your fares allow. The question everyone asks, “Seoul, Busan and Jeju, or just pick two?”: pick two. Jeju adds flights, a rental car and its own pace; squeezed into a week it becomes an airport exercise. Book KTX seats when the 60-day window opens, and run the whole week on Naver Map and a T-money card.
A week is Korea’s natural first-trip length, and the Seoul-Busan spine is the itinerary that earns the hype: the capital’s palaces-to-neon range, then the country’s second city doing beaches, fish markets and hillside color. Here’s the day shape, with the booking triggers that matter.
Days 1-4: Seoul
Day 1, arrival and the warm-up: land, AREX into the city (the airport guide settles train vs bus), pick up a T-money or WOWPASS, and spend the evening at whichever is nearest your base: Myeongdong’s street-food rows or Hongdae’s buskers and crowds. Jet lag likes a market evening; nothing needs booking.
Day 2, the royal day: Gyeongbokgung (₩3,000, closed Tuesdays, free in rented hanbok, which is why the courtyards look like a costume drama) in the morning, the Bukchon hanok lanes next door, Insadong’s craft streets for lunch, and Changdeokgung’s Secret Garden if you reserved the tour. The ₩10,000 integrated ticket covers all the palaces plus Jongmyo if you’ll hit three or more. End at Gwangjang Market’s bindaetteok and knife-cut noodle alleys.
Day 3, modern Seoul: Seongsu’s cafes or COEX, then the N Seoul Tower cable-car sunset or Seoul Sky at Lotte World Tower (₩29,000 at the gate, cheaper online) for the vertical version, and a Hongdae or Itaewon evening. Swap in a DMZ tour here if the border interests you; it eats the daylight hours and books 48-72 hours ahead.
Day 4, your-thing day: K-pop pilgrimage, museum day (the National Museum of Korea is free and world-class), a Bukhansan hike, or a shopping-and-tax-refund sweep through Olive Young and the department stores. Flexible by design; every Seoul trip needs one unscripted day.
The transfer, and days 5-7: Busan
Morning KTX from Seoul Station (or SRT from Suseo if you’re based Gangnam-side): 2.5 hours, ₩51,800-59,800, seats bookable 60 days out as of this month. You’re at lunch in Busan by noon.
Day 5: Gamcheon Culture Village, the hillside of painted houses that earns its postcards, then Jagalchi fish market where you pick the fish downstairs and eat it upstairs, and the BIFF square street-food blocks next door.
Day 6: the coast. Haeundae Beach and its Blueline beach-train stretch, Haedong Yonggungsa, the temple built onto sea rocks (go early; it’s everyone’s favorite), and seafood or the Gwangalli Bridge lights in the evening.
Day 7: morning spare capacity (Songdo’s cable car, a jjimjilbang, or nothing at all), then fly out of Gimhae if you booked open-jaw, or KTX back for an Incheon departure. Open-jaw tickets (into Incheon, out of Busan’s Gimhae or vice versa) are the single best routing trick for this itinerary; price them before defaulting to round-trip.
The Jeju question, answered properly
Jeju is Korea’s Hawaii: volcanic island, its own food, best with a rental car and three-plus unhurried days. Everything about it fights a one-week mainland itinerary — the extra flights, the car logistics, the pace change. With ten or more days, add it (fly Busan-Jeju, then Jeju-Seoul; the triangle routes cheaply). With seven, the discipline of skipping it is what makes the week good. It’ll still be there, and it deserves better than 36 hours.
FAQ
Is 7 days enough for Korea?
For Seoul plus Busan, comfortably: four nights and two-to-three nights respectively, linked by a 2.5-hour KTX. It’s the right first trip; Jeju and the countryside justify the return.
Should I do Seoul, Busan and Jeju in one week?
No; pick two. Jeju adds flights and a rental car and wants three days by itself. Seoul plus Busan needs no flights at all, which is exactly why it’s the week that works.
Do I need to book things in advance for Korea?
KTX seats (window opens 60 days out; mandatory booking only around holidays), the Changdeokgung Secret Garden tour, DMZ tours (48-72 hours), and popular restaurants. Palaces, markets and almost everything else is walk-up.
Should I fly into Incheon and out of Busan?
If fares cooperate, yes: open-jaw routing saves the half-day KTX backtrack and ends the trip at the coast. Check it against round-trip pricing before booking.
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