There are a large number of airlines offering flights to the region. Many at very reasonable prices.
The nearest airports are Porto (one hour) and Santiago de Compostela in Spain (one and a half hours) and Vigo (25 minutes).
The flight from the UK is less than 2 hours. It is also possible to fly to Lisbon with many airlines, including Monarch from the UK.
It will be necessary though to hire a car and drive 4 hours in each direction if you choose this route.
From: London Stansted, Liverpool, Bristol, Birmingham, Dublin, Baden, Barcelona, Basel, Bordeaux, Brussels, Dusseldorf, Eindhoven, Frankfurt, Girona, Lille, Lyon, Madrid, Milan, Paris, Tours, Paris, Marseille, Rome
To: Santiago de Compostela, Porto
Brittany Ferries also sail twice weekly between March and November from Plymouth to Santander and Bilbao.
Their ship, Pont-Aven, cuts the Plymouth to Santander crossing time down to 18 hours.
The drive to Yavanna is about 8 hours.