Every Seoul–Hanoi fare we track, measured against the route's typical price whenever there is enough cached history to build one. Subscribe in any RSS reader for free single-route price alerts — no account, no email needed.https://flight.dealsen-ushttps://flight.deals/flights/seoul-to-hanoi/#2026-09-05-2026-09-08-7Chttps://flight.deals/flights/seoul-to-hanoi/#2026-09-05-2026-09-08-7CSEL → HAN round-trip on Jeju Air, 2026-09-05 to 2026-09-08 (3 nights). Cached fare $133 vs typical $245.Sun, 30 Aug 2026 05:03:17 GMT