Trinity Airways is holding a sale on its Japan–Korea routes from October 1 to 15, 2026. The sale covers 15 routes linking Seoul/Incheon, Busan and Jeju with cities across Japan. The lowest fare is ¥16,050 one-way on the Seoul/Incheon–Kumamoto route. All fares shown include fuel surcharges and taxes, so you can easily see what you will actually pay. A promo code and a round-trip coupon are also available.
Sale Overview
- Booking period: October 1 – October 15, 2026
- Travel period: October 1, 2026 – March 27, 2027 (varies by route)
- Fares: ¥16,050 – ¥23,370 one-way, all-in (including fuel surcharges and taxes)
- Promo code: Enter OCT26 for up to 11% off
- Coupon: A ¥3,000 discount coupon for round-trip bookings is being distributed
- Routes: 9 routes to/from Seoul/Incheon, 4 to/from Busan and 2 to/from Jeju
As of October 3, fewer than two weeks remain in the booking period. The travel period spans about six months and, on the calendar, includes the year-end holidays and spring break. However, eligible dates differ by route. Be sure to check that your preferred dates are covered before booking.
Lowest One-Way Fares by Route
All fares are one-way totals including fuel surcharges and taxes.
Seoul/Incheon (9 routes)
- Kumamoto: ¥16,050
- Saga: ¥17,380
- Nagoya/Chubu: ¥18,140
- Tokyo/Narita: ¥18,760
- Fukuoka: ¥18,980
- Kobe: ¥20,160
- Osaka/Kansai: ¥20,950
- Sapporo/Chitose: ¥22,970
- Okinawa/Naha: ¥23,370
Busan (4 routes)
- Fukuoka: ¥16,210
- Tokyo/Narita: ¥17,335
- Osaka/Kansai: ¥17,655
- Sapporo/Chitose: ¥21,090
Jeju (2 routes)
- Fukuoka: ¥16,210
- Osaka/Kansai: ¥17,655
Fare Highlights
Kumamoto–Seoul/Incheon Is the Cheapest, and Kyushu Regional Airports Offer Great Value
The lowest fare across all routes is ¥16,050 for Seoul/Incheon–Kumamoto, followed by Seoul/Incheon–Saga at ¥17,380. Among the nine Seoul/Incheon routes, these two Kyushu airports are priced below Tokyo/Narita (¥18,760) and Osaka/Kansai (¥20,950). The most expensive Seoul/Incheon route is Okinawa/Naha at ¥23,370. That is ¥7,320 more than Kumamoto.
Fukuoka and Osaka/Kansai Cover All Three Korean Cities
Routes from both Fukuoka and Osaka/Kansai to Seoul/Incheon, Busan and Jeju are all included in the sale. From Fukuoka, Busan and Jeju are both ¥16,210, just ¥160 above the cheapest Kumamoto route. That is ¥2,770 less than Fukuoka–Seoul/Incheon at ¥18,980. From Osaka/Kansai, Busan and Jeju are also both ¥17,655.
From Tokyo, Osaka and Sapporo, Busan Is Cheaper Than Seoul
From Tokyo/Narita, Osaka/Kansai and Sapporo/Chitose, Busan fares are lower than Seoul/Incheon fares. The differences are as follows:
- Tokyo/Narita: ¥1,425 (Seoul/Incheon ¥18,760 vs. Busan ¥17,335)
- Sapporo/Chitose: ¥1,880 (Seoul/Incheon ¥22,970 vs. Busan ¥21,090)
- Osaka/Kansai: ¥3,295 (Seoul/Incheon ¥20,950 vs. Busan ¥17,655)
If you are flexible about your destination, considering Busan or Jeju can help you save.
Promo Code OCT26 and the ¥3,000 Coupon
Enter the promo code OCT26 when booking to get up to 11% off. Because 11% is the maximum, not every fare or date will necessarily receive the full discount. Check the discounted amount on the booking screen before paying.
A ¥3,000 discount coupon for round-trip purchases is also being distributed. If you plan to book a round trip, remember to obtain and apply it. For example, if you could book Kumamoto–Seoul/Incheon at ¥16,050 in both directions, the round trip would come to ¥32,100 by simple calculation. After the coupon, it would be ¥29,100. However, actual fares vary by date and direction.
The following points were not specified in the announcement, so please check the official website:
- Whether the promo code and the coupon can be combined
- How the coupon is distributed and its terms of use
Things to Check Before Booking
- The listed fares are the lowest one-way fares for each route. Depending on dates and seat availability, fares may be higher.
- Seats at the lowest fares may sell out before the booking period ends.
- Check the fare conditions when booking to see whether checked baggage and seat selection are included.
- It is also wise to check change and refund rules and fees before purchasing.
- Check the latest entry requirements for South Korea before you travel.
How to Book
Bookings can be made on Trinity Airways’ official Japanese-language website.
Official website: https://www.trinityairways.com/main.do?_langCode=JA
Select your departure city, destination and dates to search for fares, then enter the promo code OCT26 during booking. For round trips, also confirm that the ¥3,000 coupon has been applied.
Summary
Trinity Airways’ Japan–Korea sale offers one-way fares from ¥16,050 including fuel surcharges and taxes. Because fares are shown as totals, they are easy to compare. Seoul/Incheon routes from Kumamoto and Saga, and Busan and Jeju routes from Fukuoka, are especially cheap. From Tokyo, Osaka and Sapporo, Busan is cheaper than Seoul/Incheon. Make use of the code OCT26 and the ¥3,000 round-trip coupon, and consider booking before the sale ends on October 15.