Yes, Delta Air Lines allows and encourages online check-in for international flights via the Fly Delta app or Delta.com starting 24 hours before departure. However, the process for international travel is more complex than domestic because of document verification. While you can check in and receive a "confirmation" of check-in, the system may not issue a digital boarding pass until your passport and any required visas have been verified. In 2026, Delta uses the "Delta FlyReady" digital assistant, which allows you to upload photos of your passport and travel documents ahead of time; if these are cleared, you can often get your digital boarding pass instantly. If the system cannot verify your documents automatically, you will still be "checked in," but you must stop at the airport kiosk or check-in counter to have an agent manually scan your passport before you can clear security. For 2026 travelers, completing the FlyReady steps 48 hours in advance is the best way to bypass the long airport lines and head straight to the gate.