Yes, JetBlue offers online check-in for all flights, both domestic and international. Online check-in opens 24 hours before your scheduled departure and remains available until 40 minutes prior to departure for domestic flights and 60 minutes prior for international flights. This allows passengers to check in, select or change seats, add baggage, and download or print their boarding pass in advance, reducing time spent at the airport. The online check-in process is straightforward:

1. Visit the JetBlue Check-In page.

2. Enter your last name and confirmation code or ticket number.

3. Review your flight details and passenger information.

4. Choose or change your seat (if desired).

5. Add checked baggage and pay any applicable fees.

6. Download, email, or print your boarding pass.

For added convenience, you can also complete the check-in process using the JetBlue mobile app, which allows you to store your boarding pass digitally on your device. If you have checked baggage, you can drop it off at the designated bag drop counter at the airport. JetBlue recommends arriving at the airport at least 2 hours before domestic flights and 3 hours before international flights to allow ample time for check-in, security screening, and boarding.

Please note that if you encounter any issues during the online check-in process or if you prefer to check in at the airport, JetBlue provides self-service kiosks and staffed check-in counters at most airports. In such cases, it's advisable to arrive earlier to ensure a smooth check-in experience.

In summary, JetBlue's online check-in service is available 24 hours before departure and provides a convenient way to manage your flight details, select seats, add baggage, and obtain your boarding pass in advance. Utilizing online check-in can save you time and streamline your travel experience.