Tokyo to Seoul - LCC explosion, four-airport complexity, and Chuseok pricing traps.
Low-cost carriers have transformed Tokyo to Seoul into one of Northeast Asia most competitive routes. t'way, Peach, and Jin Air undercut ANA, JAL, and Korean Air by 40 to 60 percent on base fares, though luggage restrictions are tight. The route has a four-airport matrix: HND-GMP is the city-centre-to-city-centre pair (fastest overall), while NRT-ICN is where most budget seats are allocated.
Chuseok (Korean Thanksgiving, usually September or October) sends fares skyward as Korean residents in Japan head home. Cherry blossom season (late March to early April) creates reverse demand - Japanese and Koreans travelling in opposite directions. February and November are the quietest months for pricing. Midweek travel shaves 20 to 30 percent off weekend fares on this city pair. Tokyo - Seoul planning works best when transfer times and baggage rules are checked together.
Gimpo (GMP) is 20 minutes from Gangnam by subway, while Incheon (ICN) is 60 to 90 minutes from central Seoul via AREX. If you are visiting for a short weekend trip, HND-GMP saves roughly 2 hours of total ground transit. For longer stays where airport convenience matters less, NRT-ICN fares on budget carriers can drop below ВҐ10,000 one-way. When booking Tokyo - Seoul, benchmark this option against nearby alternatives for better value.
HND-GMP is dramatically more convenient - both airports are close to their respective city centres. NRT-ICN offers more budget carrier options and lower fares. If time matters more than money, HND-GMP wins. For pure price, NRT-ICN on t'way or Peach is the way to go.
Budget carriers like t'way and Peach run promotions as low as ВҐ5,000 to ВҐ10,000 one-way from Narita to Incheon. These fares include only a cabin bag. Full-service economy on ANA or Korean Air with luggage typically runs ВҐ25,000 to ВҐ40,000 round-trip.
Chuseok falls in September or October each year (follows the lunar calendar). Fares spike 3 to 5 days before and drop sharply on the return leg a week later. If you can avoid this window, pricing normalizes quickly. Book 6 to 8 weeks ahead if you must travel during Chuseok.
