Every San Francisco–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/san-francisco-to-hanoi/#2026-09-09-2026-10-06-KEhttps://flight.deals/flights/san-francisco-to-hanoi/#2026-09-09-2026-10-06-KESFO → HAN round-trip on Korean Air, 2026-09-09 to 2026-10-06 (27 nights). Cached fare $417 vs typical $795.Sun, 30 Aug 2026 05:03:17 GMT