T’way Air August t’sale: Saga to Seoul from 15,183 Yen, Until August 31

Lowest one-way total, Saga to Seoul (Incheon)JPY 15,183and upWith the code AUG26. Shown as a total including the fuel surcharge and taxes

Airline

T’way Air, August t’sale

Routes

International routes departing Japan; seventeen sectors could be counted through the official booking links

Sale period

2026-08-01 – 2026-08-31

Travel period

2026-08-01 – 2027-03-27

Booking channel

Official site, mobile web and the official app only; the code cannot be applied through an agency or a comparison site

Deadline

2026-08-31, with limited numbers and the possibility of closing early

Checked on

2026-08-05 (official event page)

T’way Air handed out the code AUG26 on international routes departing Japan through August 2026. The floor was JPY 15,183 one way, Saga to Seoul (Incheon), and travel could be taken up to 27 March 2027.

Thirty-one days on sale, 239 days of travel — but the discount only touches the fare

The official page carried the fares as an image, so the figures come from LCCjp’s listing dated 3 August 2026. The count of sectors comes from the origin and destination codes in the official booking links.

The condition that matters most is what the code reaches. T’way Air’s own notes say the code works only on itineraries departing Japan, that some periods and fare types are excluded, that coupons cannot be combined with event fares, and — the one to read twice — that the discount applies to the airfare after the fuel surcharge and airport facility charges are taken out. The JPY 15,183 in the table is quoted as a total with the surcharge and taxes inside it, while the reduction lands only on the part left when those are removed. Against the total, the effective rate is smaller than the code implies, and rarely more than 10%. On any international departure from Japan there is also the international tourist tax, raised to JPY 3,000 on tickets issued from 1 July 2026.

The official booking links and the secondary route list also disagree by one sector. LCCjp lists Kansai to Cheongju among the covered routes; the official page has no Kansai–Cheongju booking link, and carries the Kansai–Jeju link three times over instead. For Cheongju out of Kansai the reliable move was to enter the code, run an availability search and watch whether the fare actually moved.

The spread is what makes Kyushu the story. Saga to Seoul at JPY 15,183 against New Chitose to Seoul at JPY 29,250 is a factor of 1.93. On the same Seoul route, Naha is JPY 22,080 — JPY 6,897 above Saga. From Kyushu the return trip lands in the low JPY 30,000s. And the travel window is 239 days, from 1 August 2026 to 27 March 2027, which takes in the new year and the spring holidays. This was not a sale to fly on now; it was a sale to fix a date months out.

Three other campaigns ran alongside it on the same event page: the summer holiday Guam support campaign, up to USD 60 per person, from 8 June to 31 August; “From Japan, to a wider world of travel”, up to 7% off connecting routes, from 15 July to 31 October; and a members-only 20% discount on Big Bus city tours, 1 August to 31 December. For Guam that mattered, because the JPY 36,016 fare and the Guam campaign both closed on 31 August; for anyone connecting beyond Seoul, the 7% offer ran two months longer.

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

More: the Korea sales of the same week ran for 48 hours, against this one’s 31 days

Early August 2026 had several Korea sales out of Japan at once. The t’sale sold for 31 days, 1 to 31 August. Jeju Air’s September–October special fares opened at 10:00 on 3 August and closed at 09:59 on 5 August — 48 hours. Eastar Jet’s late-summer sale also opened at 10:00 on 3 August, with no closing date published. Thirty-one days against two is a gap of more than fifteen times.

Comparing the face values across them means nothing, though, because the figures are built differently. The t’sale quotes a total with the fuel surcharge and taxes inside; Jeju Air and Eastar Jet quote fares with both still to be added. “JPY 100 one way” from one and “JPY 15,183 one way” from another are not measured on the same ruler. The only way to line them up is to run each booking through to the final payable total. That is also why the two-day sales are usually over by the time anyone notices them, and why this one could be weighed at leisure — the booking techniques for cheap flights cover how to read the difference.

Source: T’way Air official event page for the August t’sale and the official event list (checked 2026-08-05) / fares by route and the travel period from LCCjp, “T’way Air’s t’sale is on!”, 3 August 2026 (secondary source) / Photo: Masahiro TAKAGI, CC BY 2.0 (Wikimedia Commons) / Checked on 2026-08-05