It is not forbidden but...It is not specifically forbidden to drive with flip-flops, but you can be penalised for not being able to maintain freedom of movement to control the pedals well, the Guardia Civil pointed out.
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As a general rule, the law does not specifically prohibit you from driving barefoot, or with flip flops, but remember that if you have an accident and were maybe unable to use the vehicle's pedals correctly, you can be penalised.
High-traffic areas like airports and airplanes can harbor harmful microbes that may lead to infections and illnesses. Lack of Foot Support: Keep in mind that flip flops lack proper arch support and cushioning, which can result in foot fatigue, discomfort, and even pain, especially during long flights.
“In Spain, traffic police consider driving shirtless to be a threat to your safety and your ability to move, which means it is against the law to strip off your top half. “When travelling abroad it's essential to respect the local rules and regulations, even if they seem very different to what we're used to at home.”
Shoes to avoid? Flip flops. There's not enough support and unless you're at a beach, you won't see Europeans wearing flip flops. I'd also recommend avoiding high heel stilettos as a lot of European streets are cobblestones.
Tony Kuna, who used to work as as a member of the cabin crew, explained that it could cause problems if there is an emergency during a flight. He wrote on Quora: “During an emergency, all sorts of debris and unpleasant ground surfaces will block your way towards the exit, as well as outside the aircraft.