Seoul (ICN) to Nha Trang (NHA): 2,057 miles (3,311 km) great-circle, about 4h 35m nonstop by our estimate. Cheapest fare observed: $198 round-trip on T'way Air, nonstop, departing May 10, 2026.
$198 round-trip, T'way Air TW33, departing 2026-05-10 at 19:00, returning 2026-05-15. The recorded itinerary left on a Sunday, returning on a Friday 5 nights later; the fare was observed 15 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $198, it ranked 5th of the 30 round-trip fares we recorded from ICN (median $393). That is 9.6 cents per great-circle mile (round-trip price over one-way distance), below the ICN median of 21.3 cents across 30 round-trip routes.
Routes from ICN of similar length: Da Nang (1,852 mi) at $215 and Bangkok (2,280 mi) at $250.
T'way Air had the cheapest fare on 2 of 30 ICN routes. It is the 16th longest of the 30 routes we track from ICN.
Of 17 departure airports with a fare to Nha Trang, Seoul (ICN) ranked 6th at $198. Lowest: $109 from Ho Chi Minh City (SGN); highest: $789 from Kathmandu (KTM); 7 nonstop. Cheapest-fare airlines (routes): VietJet Air (4), AirAsia (2), Sichuan Airlines (2), Thai Vietjet Air (2), Vietnam Airlines (2) and Air India (1), plus 4 more.
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones Asia/Seoul, Asia/Ho_Chi_Minh; flight time is our estimate.