| 1 | ICN to MEX Mexico City, Mexico | 7,516 mi | 16h 5m | Aeromexico | 1/day |
| 2 | ICN to ATL Atlanta, United States | 7,138 mi | 15h 19m | Delta Air Lines and Korean Air | 4-5/day |
| 3 | ICN to IAD Washington, United States | 6,942 mi | 14h 54m | Korean Air and Perimeter Aviation | 1-2/day |
| 4 | ICN to JFK New York, United States | 6,890 mi | 14h 48m | Asiana Airlines and Korean Air | 4/day |
| 5 | ICN to EWR Newark, United States | 6,881 mi | 14h 47m | Perimeter Aviation and APZ | 1-2/day |
| 6 | ICN to DFW Dallas, United States | 6,827 mi | 14h 40m | American Airlines and Korean Air | 2/day |
| 7 | ICN to BOS Boston, United States | 6,813 mi | 14h 38m | Korean Air | 1/day |
| 8 | ICN to DTW Detroit, United States | 6,620 mi | 14h 15m | Delta Air Lines | 1/day |
| 9 | ICN to YYZ Toronto, Canada | 6,597 mi | 14h 12m | Air Canada and Korean Air | 2/day |
| 10 | ICN to YUL Montreal, Canada | 6,570 mi | 14h 8m | Air Canada | 3×/wk |
| 11 | ICN to ORD Chicago, United States | 6,536 mi | 14h 4m | Korean Air | 1/day |
| 12 | ICN to LIS Lisbon, Portugal | 6,460 mi | 13h 55m | Korean Air | 3×/wk |
| 13 | ICN to MSP Minneapolis, United States | 6,233 mi | 13h 27m | Delta Air Lines | 1-2/day |
| 14 | ICN to MAD Madrid, Spain | 6,191 mi | 13h 21m | Korean Air | 1/day |
| 15 | ICN to LAS Las Vegas, United States | 6,008 mi | 12h 59m | Korean Air | 1/day |
| 16 | ICN to AKL Auckland, New Zealand | 6,000 mi | 12h 58m | Korean Air | 1/day |
| 17 | ICN to LAX Los Angeles, United States | 5,981 mi | 12h 55m | Korean Air, Asiana Airlines, and Perimeter Aviation | 7-8/day |
| 18 | ICN to BCN Barcelona, Spain | 5,962 mi | 12h 53m | Asiana Airlines and T'Way Air | 1-2/day |
| 19 | ICN to SLC Salt Lake City, United States | 5,890 mi | 12h 44m | Delta Air Lines | 1/day |
| 20 | ICN to ADD Addis Ababa, Ethiopia | 5,714 mi | 12h 22m | Ethiopian Airlines | 1/day |
| 21 | ICN to SFO San Francisco, United States | 5,645 mi | 12h 14m | United Airlines, Asiana Airlines, and Korean Air | 4-5/day |
| 22 | ICN to FCO Rome, Italy | 5,570 mi | 12h 5m | T'Way Air, Asiana Airlines, and Korean Air | 2/day |
| 23 | ICN to CDG Paris, France | 5,547 mi | 12h 2m | Air France, Korean Air, and Asiana Airlines | 3-4/day |
| 24 | ICN to MXP Milan, Italy | 5,515 mi | 11h 58m | Korean Air and Asiana Airlines | 1/day |
| 25 | ICN to LHR London, United Kingdom | 5,506 mi | 11h 57m | Asiana Airlines, Korean Air, and Virgin Atlantic | 2-3/day |