BRITS have been warned of "multiple flight cancellations" ahead of airport strikes next week. The Portuguese Transport Workers' Union, Sttamp, announced the disruption expected - check the key dates to see if you'll be effected. 1 Brits have been warned of 'multiple flight cancellations' that will affect those travelling to Portugal Credit: Rex The Groundforce workers' strike is scheduled for August 31 and September 1 and will cause "severe constraints" at airports.

Sttamp said: "As there has been no negotiation development to date that would allow the strike to be called off, if it were to take place it would certainly cause severe constraints at national airports." It added that particularly Porto and Lisbon will be the worst impacted and the effects of the strike are "currently completely unpredictable". EasyJet, TAP Air Portugal, British Airways, Ryanair, Wizz Air UK, Azores Airlines S.

A and Vueling Airlines could all be impacted by the strike as they all take passengers to the Portuguese national airports. read more on flights SANDS GREAT Europe's best beach has white sands, £3 beers & four flights from the UK TAKING OFF Airline to relaunch UK flights to 'other-worldly' tiny islands next year The union guaranteed that there would be delays and "numerous flight cancellations" to all destinations operated by airlines assisted by SPdH - Portuguese Handling Services, such as TAP. Sttamp advised passengers with trips scheduled for the days of the strike confirm their travel .