The Foreign Office has issued a warning to holidaymakers travelling to Spain in July.
Passengers travelling on EasyJet and Ryanair flights to and from Spain could face disruption, delays and cancellations. Ryanair staff plan to strike for 12 days this month over working conditions.
Cabin crew will strike between July 12 to 15, July 18 to 21 and July 25 to 28.
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The strikes will take place at 10 airports that Ryanair operates across Spain. Alicante, Barcelona, Girona, Ibiza, Madrid, Málaga, Palma, Valencia, Santiago de Compostela and Sevilla are the affected airports.
EasyJet staff are planning to strike on July 15, 16, 17, 29, 30 and 31. It's reported this will affect airports in Barcelona, Malaga and Palma.
EasyJet also announced last month it would scrap thousands of summer flights in a bid to avoid last-minute cancellations.
The aviation sector is struggling to cope with the rising demand for travel amid staff shortages and difficulties obtaining security clearance for new recruits.
Commenting on the industrial action, the UK's Foreign Office said: "Planned strike action in July may cause some disruption to EasyJet and Ryanair flights to and from Spain. If you think your travel plans may be affected, you should consult your airline for the latest travel updates."
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