How long is the flight from ICN to KMJ?

About 1 h 35 min gate to gate, estimated from the distance. Real times depend on winds and the routing.

Which airlines fly nonstop between ICN and KMJ?

Trinity Airways, Korean Air Lines flew the route in Jan 2026 – Jun 2026, with 28 flights a week in both directions together.

How much EU261 compensation is a delay on ICN–KMJ worth?

Neither EU261 nor UK261 applies: the route neither starts nor ends in the EU, EEA, Switzerland or the UK.

How much CO2 does a flight from ICN to KMJ emit?

About 82 kg CO2e per economy passenger one way, including the extra warming effect of flying high (48 kg without it), using the UK government's 2026 conversion factors.

AirportMiles

Seoul (ICN) – Kumamoto (KMJ)

Flights on Google Skyscanner

Distance, flight time and the airlines that fly it, from open data.

Distance: 652 km; 405 mi · 352 nm
Flight time: 1 h 35 min; Estimate from distance
Time difference: none
CO2 per passenger: 82 kg; One way, economy, incl. RF (48 kg CO2 only)
Passengers, 6 months: 103,801; Jan 2026 – Jun 2026
Flights / week: 28; Both directions, average
Seats filled: —
Airlines nonstop: 2; TW, KE

Traffic: Incheon International Airport Corporation (Korea), scheduled passenger flights, Jan 2026 – Jun 2026. Distance: WGS-84 ellipsoid. CO2: UK DESNZ 2026 factors. Sources

Shortest path over the earth's surface (great circle). Real flights bend around weather, winds and airspace.

The way there

Heading from ICN: 141°
Heading from KMJ: 323°
Halfway point: 35.17, 128.72
Great-circle km: 652 km (sphere, for EU261)
Clocks: Same time in both

The estimate for a route without real times is 1 h 35 min; how it is worked out is on Sources.

Passengers per month, both directions (Jan 2026 – Jun 2026)Busiest: March 2026: 18,957 passengers

Show as a table

Month	Passengers
Jan 2026	18,113
Feb 2026	17,095
Mar 2026	18,957
Apr 2026	17,622
May 2026	17,141
Jun 2026	14,873

Flights per month, both directions (Jan 2026 – Jun 2026)Busiest: January 2026: 124 flights

Show as a table

Month	Flights
Jan 2026	124
Feb 2026	112
Mar 2026	124
Apr 2026	120
May 2026	124
Jun 2026	120

Airlines flying ICN–KMJ nonstop

Airline	Flights / week	Passengers, 6 months	Share of passengers
TWTrinity Airways	14	58,144	56%
KEKorean Air Lines	14	45,657	44%

Both directions, Jan 2026 – Jun 2026. Airlines with at least one flight a month. Incheon International Airport Corporation (Korea), scheduled passenger flights. Sources

Delay compensation (EU261 / UK261)

Measured by great-circle distance: 652 km.

Neither EU261 nor UK261 covers this route: it neither starts nor ends in the EU, EEA, Switzerland or the UK. Other countries have their own rules (for example Canada's APPR or Brazil's ANAC rules).

Also owed for a cancellation with less than 14 days' notice or denied boarding. Not owed for extraordinary circumstances. On a connection, the distance to the final destination counts. From 23 October 2027 the EU's Regulation 2026/2202 applies; it keeps these amounts (what changes in 2027). Information, not legal advice.

Every airport pair between Seoul and Kumamoto

	KMJ
ICN	652
GMP	641

Kilometres. Linked numbers have a page of their own. All Seoul airports

More routes from ICN

Route	To	Distance	Passengers
ICN → NRT	Tokyo, Japan	1,260 km	2,519,026 (6 mo)
ICN → KIX	Osaka, Japan	862 km	2,313,960 (6 mo)
ICN → FUK	Fukuoka, Japan	563 km	1,708,245 (6 mo)
ICN → HKG	Hong Kong, Hong Kong	2,067 km	1,316,010 (6 mo)
ICN → TPE	Taoyuan, Taiwan	1,460 km	1,184,972 (6 mo)
ICN → PVG	Shanghai, China	821 km	1,111,272 (6 mo)
ICN → BKK	Bangkok, Thailand	3,665 km	950,069 (6 mo)
ICN → DAD	Da Nang, Vietnam	2,976 km	941,076 (6 mo)
ICN → SIN	Singapore, Singapore	4,614 km	900,158 (6 mo)
ICN → TAO	Qingdao, China	580 km	797,360 (6 mo)

Questions

Seoul (ICN) and Kumamoto (KMJ) are 652 km (405 miles, 352 nautical miles) apart, measured along the shortest path over the earth's surface.