For the famous tomato fight that takes place in Buñol near Valencia last Wednesday of August, I found the cheapest flight at 155 euros with transit in Munich. At departure you get to spend a night there so a good occasion for a famous Munich beer. For a direct flight with Wizzair the price would be around 800 lei. It is August so the prices are high, but cheaper than Alicante.
Do rent a car and stroll the coast to Alicante or head towards Barcelona in north. Discover the beaches and stay in small houses, traditional fincas. Check Airbnb as I saw great houses there.
With Lufthansa more dates available for the same price.
Note that we are not an online tourism agent and do not provide services of any commercial type. We just share what we find and give you suggestions about great destinations in the best periods.