Jin Air to Busan: 4,000 yen off a round trip with code KTOPUS, first 300 only

Discount (round trip, off the air fare)JPY 4,000offJPY 2,000 one way. A logged-in member booking with the code KTOPUS, capped at the first 300

Airline

Jin Air

Routes

Fukuoka, Okinawa (Naha) and Miyako (Shimojishima) to Busan

Sale period

2026-08-17 – 2026-10-31

Travel period

Not stated on the official page (the Kobe promotion that began the same day reads 2026-08-18 – 2026-10-31)

Deadline

2026-10-31, or once 300 claims are in; 15 days are excluded on Japan departures and 12 on Korea departures

Checked on

2026-08-20

Jin Air is handing out a promotion code, KTOPUS, worth JPY 2,000 one way and JPY 4,000 return off the air fare on Busan flights from Fukuoka, Naha and Shimojishima. It is capped at the first 300 claims and runs from 17 August to 31 October 2026, for logged-in members booking on the Japanese site or the app.

The page has no travel-period line, so whether 31 October is the booking deadline or the flying deadline cannot be settled

Jin Air opened a Kobe route promotion on the same 17 August, and that page carries a clearly labelled travel period of 18 August to 31 October 2026. The Busan page has the discount, the excluded dates and the conditions, and no line for travel at all. So 31 October could be the last day to book or the last day to fly, and the official wording does not decide it. Filling that gap by assumption is how an itinerary goes wrong. Anyone aiming at November should put the dates into the booking screen and watch whether the code is accepted before committing. If the framework matches the Kobe route it ends with 31 October travel — but that is not what the page says.

The excluded dates are stated. Japan departures are out from 18 to 27 September, on 4 and 5 October, and from 9 to 11 October; Korea departures from 19 to 26 September, on 3 October, on 9 October and from 11 to 12 October. That is 15 days and 12 days, and it matches the Kobe promotion day for day, which makes it reasonable to treat every Jin Air code from Japan this autumn as missing the same calendar. The September holiday is almost entirely excluded in both directions. Whether the dates can move onto weekdays decides whether the code is usable at all.

To use it: log in, enter the itinerary, type KTOPUS into the promotion code field and search. The results show the discounted amount, so what came off is visible there rather than at checkout. The event page also carries an entry button, which is easy to miss. It cannot be combined with another promotion code, coupon or discount, and it comes off the air fare alone — the fuel surcharge and airport taxes are untouched. Reading what a quoted fare covers is set out separately.

When does the next airfare sale come? Six weeks of records and what is bookable now →

More: Air Busan is tiered and Jin Air is flat, so the gap widens on the cheap days

The other Busan offer running alongside it was Air Busan’s second Busan Trip Coupon: one departure point, Takamatsu, a discount that climbs from JPY 2,000 to JPY 9,000 with the value of the round trip, a window from 1 August to 24 October, and an allocation that was first come, first served with the number unpublished. KTOPUS covers three airports, pays a flat JPY 4,000 on a return whatever the fare, and caps at 300.

A tiered coupon rewards the expensive ticket: the top JPY 9,000 needs a round trip of JPY 11,000 or more, so choosing a cheap day shrinks the discount with it. A flat amount runs the other way, and its effective rate rises as the fare falls. For anyone whose method is to hunt for the cheap date and buy it, Jin Air’s side gives the higher percentage even though the headline number is lower. Rooms move the total as much as the fare does, and what a night in Busan costs is the figure to set beside JPY 4,000.

Source: Jin Air official promotion page, “Fukuoka, Okinawa and Miyako (SHI) — Busan now!” (checked 2026-08-20; the site sits behind a bot check and changes after that date are unverified) / Photo: Masahiro TAKAGI, CC BY 2.0 (Wikimedia Commons — Boeing 737-8SH(WL) HL8012) / Checked on 2026-08-20