We are doing all we can to minimise the disruption to our customers.
Customers due to fly to or from Spain today can rebook to an alternate date free of charge. Customers on cancelled services can also take a full refund.
We are also looking at putting on larger aircraft to help as many customers as possible. We are advising customers to check ba.com for the latest flight information.
We apologise to our customers for any inconvenience caused by industrial action which is beyond our control.
Police and protesters clashed in Spain, Italy and Portugal as millions of workers went on strike to challenge to austerity policies.
As well as strikes across Europe, today has also produced figures that may convince people at the top that austerity is self-defeating.