One more interesting solution from Europe to South Korea with 4-star Etihad Airways is available from Spain. The cheapest full-service return flights from and Barcelona to Seoul are available for just €369. Flights have one layover in Abu Dhabi on the way. There is a longer layover on the inbound leg you would have to accept if you want to book one of the cheapest options on this route we have ever seen!
Flying from: Madrid, Barcelona
Flying to: Seoul
Airline(s): Etihad Airways
Luggage: 1x20kg bag
Travel period: You must complete all travel by the 20th of November 2021
Max stay: 3 months
Book by: 27th of August
See also Zurich to Asia or Africa from €341 (India, Maldives, Seychelles, Thailand, Bangladesh, South Korea and Japan)
Booking sample of cheap full-service Etihad flights from Spain to Seoul, South Korea for €369! As per the above link to this promo deal, you would depart from Madrid to Seoul Incheon on the 7th of November. Return flight from South Korea back to Spain on the 23rd of November 2021.