What is the phone number for delta airlines reservations? The domestic reservations phone number for Delta Airlines is 1-800-221-1212, and the international reservations phone number is 1-800-241-4141, as of 2015. These phone numbers are only available for customers calling from the United States, Puerto Rico, the U.S. Virgin Islands and Canada.What is delta airlines customer support phone number? Customers can contact Delta Air Lines using the telephone number 800-455-2720 to reach Customer Care, which handles service comments and complaints. Those needing to make domestic flight reservations can call 800-221-1212, while customers needing international flight reservations can call 800-241-4141.How can i contact delta customer service? American Airline’s business class seats are currently better than the United or Delta equivalent Business Class seats. This will change as Delta retrofits their fleet with new Delta One Suites.