Check-in with Spring Airlines
Online check-in
You can only check in at the airport with Spring Airlines. Their general terms and conditions do not mention the option of online check-in.
Airport check-in
Check-in counters open approximately 90 minutes before departure and close 45 minutes before departure. If you will be paying for your tickets with an international credit card, it is recommended that you bring it with you. It is possible that the check-in staff will want to see it. Also, make sure you bring the same passport or ID you entered when you made your reservation.