Oneworld partners British Airways and Iberia are offering great solution for travellers in Spain to explore South Korea. Return tickets from main airports such as Barcelona, Madrid, Bilbao or Malaga are now available from €351. This fare is including all charges and fees and checked bag. Note that the cheapest tariff available requires longer layover in London on your outbound and / or inbgound flight is required. This is good option alsso for travellers in the UK to visit Spain then end their trip in London..
To book the cheapest flights with British Airways and Iberia you have to look for flights departing to South Korea till 28th of March then from 8th of September till end of November 2017. Promotion is running till 23rd of February or until sold out..Seems you have to look for flights between Monday and Thursday..
Booking sample of Iberia and British Airways discounted flights from Europe to South Korea for just €351 below. In this case you would depart from Bilbao to Seoul on 6th of November. Your return flight from this Asian country back to Spain via London would be on 21st of November 2017.