Heads up, deal hunters! If you're dreaming of tapas and exploring the Guggenheim Museum Bilbao, you're in luck. The Flight Deal has spotted some seriously cheap flights to Bilbao, Spain, for under $600 roundtrip in regular economy. This is a steal because flights to Europe, especially to cool cities like Bilbao, usually cost a lot more. To find this deal, The Flight Deal recommends using Matrix Airfare Search by ITA Software (it's a tool that helps you find the cheapest flight combinations). Once you find the dates on Matrix, you can then book directly with the airline or through your favorite online travel agency. Why should you care? Well, if you've been putting off that Spanish adventure because of flight costs, now's your chance. Deals like this don't last forever, so start searching now and you could be sipping sangria in Spain sooner than you think!