Hanoi (HAN) to Seoul (SEL): 1,668 miles (2,684 km) great-circle, about 3h 50m nonstop by our estimate. Cheapest fare observed: $390 round-trip on airline 9G, with 1 stop, departing April 30, 2026.
$390 round-trip, airline 9G 9G943, departing 2026-04-30 at 20:40, returning 2026-05-04. The recorded itinerary left on a Thursday, returning on a Monday 4 nights later; the fare was observed 5 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $390, it ranked 19th of the 30 round-trip fares we recorded from HAN (median $271). That is 23.4 cents per great-circle mile (round-trip price over one-way distance), close to the HAN median of 25.9 cents across 30 round-trip routes.
Routes from HAN of similar length: Beijing (1,449 mi) at $273 and Singapore (1,378 mi) at $269.
HAN to SEL is the only one of 30 HAN routes where airline 9G priced cheapest. It is the 14th longest of the 30 routes we track from HAN.
Of 24 departure airports with a fare to Seoul, Hanoi (HAN) ranked 15th at $390. Lowest: $142 from Osaka (KIX); highest: $1288 from Portland (PDX); 10 nonstop. Cheapest-fare airlines (routes): Jetstar (2), Peach Aviation (2), airline 9G (1), airline WE (1), Alaska Airlines (1) and Asiana (1), plus 16 more.
That depends on your passport and trip, so check the official source for South Korea: Republic of Korea: K-ETA. Connecting elsewhere? Check that country's transit rules too.
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones Asia/Ho_Chi_Minh, Asia/Seoul; flight time is our estimate.