Hi I'm trying to find the cheapest way for my dad to fly to spain it hads to be the north east of spain like biarritz zaragoza santander etc etc please help me find the cheapest way to get to any of these airports he wants to leave on the 26th of may one way flight please help me thank you everyone

Here's one I use:
San Francisco Bay Area & San Jose City Attractions Guide

Use the search box "Find the Best Airfare Deals".
All airline databases are searched and a list is presented to you upon completion.

Hope this helps :)