Contact Jet2 Airways on their UK telephone number 0333 300 0737 for enquiries about their package holidays, airline flights and emergency procedures. If you are calling from outside the country you should dial their international helpline +44203 059 8336 instead.
However if you have a formal enquiry or you wish to send a serious complaint you may instead consider posting a letter to the Jet2 head office which is located at the following Leeds postal address: Jet2, PO Box 284, Leeds, LS11 1GE, United Kingdom.
Jet2 is a UK-based airline & package holidays agent with several hubs in the country. They fly to various destinations throughout Europe as well as a transatlantic route to New York.