Passengers onboard a flight are not allowed to vape on any airline in the UK.
Both EasyJet and Ryanair allow passengers to carry their vapes in their hand luggage but have a strict no smoking policy that applies to vaping.
E-cigarettes must not be checked in either.
Ryanair even reserves the right to refuse passengers on board a flight if "you have smoked, or attempted to smoke, on a previous flight".
If you are caught vaping on a flight then you could face heavy fines or being banned from the airline.