Early April will see most of Arillas closed, and the weather can be "changeable." We love it like that, since we always spend 2-3 weeks in July with the heat, hustle and bustle, and use it as a time to catch up with friends, and truly recharge our batteries. It wouldn't suit everyone. That said, this year we did loads, and the weather was glorious. (Thank you to all who spent time with us.)
Peak season flights at £600-700 each (or even half that) would see us staying in the UK. As many have said, we gamble by booking and paying for flights as they are released (usually about September/October) and this year paid £165 each.return. You won't end up in a tent on the beach, and will find somewhere to stay, but in July/August the most popular fill up early.
Best wishes
Phil