| CJU–GMP | Jeju City – Seoul | 3,677 |
| ICN–NRT | Seoul – Narita | 1,680 |
| LAX–SFO | Los Angeles – San Francisco | 1,360 |
| HKG–ICN | Hong Kong – Seoul | 1,194 |
| CJU–PUS | Jeju City – Busan | 882 |
| ORD–SEA | Chicago – Seattle | 847 |
| ATL–ORD | Atlanta – Chicago | 833 |
| CJJ–CJU | Cheongju – Jeju City | 774 |
| ANC–ORD | Anchorage – Chicago | 739 |
| HAN–ICN | Hanoi (Soc Son) – Seoul | 737 |
| ICN–PVG | Seoul – Shanghai (Pudong) | 736 |
| MSP–ORD | Minneapolis – Chicago | 710 |
| BKK–ICN | Bangkok – Seoul | 708 |
| DAD–ICN | Da Nang – Seoul | 689 |
| ICN–TPE | Seoul – Taoyuan | 609 |
| GMP–PUS | Seoul – Busan | 568 |
| ICN–LAX | Seoul – Los Angeles | 563 |
| CJU–TAE | Jeju City – Daegu | 563 |
| JFK–MIA | New York – Miami | 562 |
| ICN–SIN | Seoul – Singapore | 560 |
| ICN–MNL | Seoul – Manila (Pasay) | 528 |
| CXR–ICN | Nha Trang/nha Trang aiurportCam Ranh – Seoul | 527 |
| ICN–SGN | Seoul – Ho Chi Minh City | 513 |
| GMP–HND | Seoul – Tokyo | 494 |
| ANC–PVG | Anchorage – Shanghai (Pudong) | 472 |
| ANC–ICN | Anchorage – Seoul | 434 |
| CJU–KWJ | Jeju City – Gwangju | 433 |
| ICN–PQC | Seoul – Phu Quoc Island | 407 |
| CTS–ICN | Sapporo – Seoul | 378 |
| GMP–KIX | Seoul – Osaka | 368 |
| ATL–YYZ | Atlanta – Toronto | 368 |
| CAN–ICN | Guangzhou (Huadu) – Seoul | 351 |
| ICN–NGO | Seoul – Tokoname | 345 |
| ICN–PEK | Seoul – Beijing | 324 |
| ICN–SFO | Seoul – San Francisco | 306 |
| ICN–ORD | Seoul – Chicago | 293 |
| ICN–JFK | Seoul – New York | 293 |
| NRT–PUS | Narita – Busan | 284 |
| ICN–SEA | Seoul – Seattle | 261 |
| ATL–ICN | Atlanta – Seoul | 246 |
| GUM–ICN | Hagåtña – Seoul | 237 |
| FRA–ICN | Frankfurt am Main – Seoul | 235 |
| ICN–SZX | Seoul – Shenzhen | 229 |
| ICN–SYD | Seoul – Sydney (Mascot) | 220 |
| ICN–KUL | Seoul – Sepang | 220 |
| ICN–UBN | Seoul – Ulaanbaatar (Sergelen) | 220 |
| ICN–YNJ | Seoul – Yanji | 218 |
| CDG–ICN | Paris (Roissy-en-France, Val-d'Oise) – Seoul | 212 |
| DLC–ICN | Dalian (Ganjingzi) – Seoul | 208 |
| ICN–SHE | Seoul – Shenyang | 208 |
| ICN–YVR | Seoul – Vancouver | 207 |
| DAD–PUS | Da Nang – Busan | 205 |
| CGK–ICN | Jakarta – Seoul | 204 |
| ICN–OKA | Seoul – Naha | 204 |
| ANC–JFK | Anchorage – New York | 201 |
| ICN–PUS | Seoul – Busan | 198 |
| ICN–LHR | Seoul – London | 193 |
| ICN–IST | Seoul – Istanbul | 193 |
| ICN–TSN | Seoul – Tianjin | 188 |
| ANC–MIA | Anchorage – Miami | 187 |
| PUS–PVG | Busan – Shanghai (Pudong) | 183 |
| CGK–PEN | Jakarta – Penang | 182 |
| AMS–ICN | Amsterdam – Seoul | 170 |
| DPS–ICN | Kuta, Badung – Seoul | 168 |
| DEL–HAN | New Delhi – Hanoi (Soc Son) | 164 |
| ICN–MFM | Seoul – Nossa Senhora do Carmo | 163 |
| DFW–ICN | Dallas-Fort Worth – Seoul | 159 |
| LAX–LIM | Los Angeles – Lima | 156 |
| ICN–YYZ | Seoul – Toronto | 153 |
| MAD–VIE | Madrid – Vienna | 152 |
| ICN–UKB | Seoul – Kobe | 151 |
| GMP–SHA | Seoul – Shanghai (Minhang) | 149 |
| HNL–ICN | Honolulu, Oahu – Seoul | 148 |
| HND–ICN | Tokyo – Seoul | 147 |
| CEB–ICN | Cebu City/Lapu-Lapu City – Seoul | 143 |
| DFW–GDL | Dallas-Fort Worth – Guadalajara | 142 |
| CAI–SAW | Cairo – Pendik, Istanbul | 136 |
| ICN–NKG | Seoul – Nanjing | 135 |
| FCO–ICN | Rome – Seoul | 128 |
| ICN–KTI | Seoul – Phnom Penh (Boeng Khyang) | 122 |
| ICN–XIY | Seoul – Xi'an | 120 |
| HGH–ICN | Hangzhou – Seoul | 117 |
| HKT–ICN | Phuket – Seoul | 115 |
| CGO–ICN | Zhengzhou – Seoul | 115 |
| ICN–XMN | Seoul – Xiamen | 104 |
| IAD–ICN | Dulles – Seoul | 102 |
| ICN–MXP | Seoul – Ferno (VA) | 98 |
| ICN–VIE | Seoul – Vienna | 95 |
| GMP–PEK | Seoul – Beijing | 91 |
| DYG–ICN | Zhangjiajie (Yongding) – Seoul | 90 |
| GMP–USN | Seoul – Ulsan | 87 |
| DEL–ICN | New Delhi – Seoul | 86 |
| ICN–KMJ | Seoul – Kumamoto | 85 |
| CSX–ICN | Changsha (Changsha) – Seoul | 82 |
| CJU–PEK | Jeju City – Beijing | 80 |
| CJU–RSU | Jeju City – Yeosu | 77 |
| CJU–USN | Jeju City – Ulsan | 76 |
| ICN–PRG | Seoul – Prague | 76 |
| ANC–CGO | Anchorage – Zhengzhou | 75 |
| BUD–ICN | Budapest – Seoul | 73 |
| PEK–PUS | Beijing – Busan | 73 |
| FOC–ICN | Fuzhou (Changle) – Seoul | 71 |
| NGO–PUS | Tokoname – Busan | 70 |
| OSL–VIE | Oslo (Gardermoen) – Vienna | 70 |
| BNE–ICN | Brisbane – Seoul | 65 |
| ICN–KMG | Seoul – Kunming | 64 |
| ICN–ZRH | Seoul – Zurich | 59 |
| ANC–ATL | Anchorage – Atlanta | 58 |
| BOS–ICN | Boston – Seoul | 58 |
| ICN–WUH | Seoul – Wuhan (Huangpi) | 56 |
| DEL–VIE | New Delhi – Vienna | 55 |
| ICN–LAS | Seoul – Las Vegas | 54 |
| BKK–PEN | Bangkok – Penang | 51 |
| PUS–TAO | Busan – Qingdao (Jiaozhou) | 51 |
| ICN–LIS | Seoul – Lisbon | 44 |
| GDL–YVR | Guadalajara – Vancouver | 44 |
| AMS–FRA | Amsterdam – Frankfurt am Main | 44 |
| ICN–MAD | Seoul – Madrid | 42 |
| ICN–KIJ | Seoul – Niigata | 42 |
| AKL–ICN | Auckland – Seoul | 40 |
