+1-888-413-6950 Delta Airlines check in policy aims to provide flexibility and convenience to passengers, allowing them to choose the method that best suits their preferences and travel needs. To make a flight check-in: As early as 24 hours before the departure of your first flight, visit the website of your airline. Use your online account's confirmation number to check in. Additionally, you will be able to confirm your seating options and view your seats, provided the airlines enable it.