What is the customer service number for kayak? The customer support phone number of Kayak Flights Contact is +1-203-899-3100 (Click phone number to call).What is the phone number for kayak? Phone Number of Kayak is (203) 899-3100 / 978-451-0771 / 855-529-2501 . Kayak is one of the most preferred online travel search engine, and a travel agency.What is the 800 phone number? A 1-800 phone number is a toll free number used by both large and small businesses.What is 800 phone service? An 800 number is a special telephone number where the calling party is not charged for the long distance call by the telephone operator. This type of phone service is also referred to as toll free service.