Can I still cancel my flight after online check-in?

Usually yes, you can still cancel, but the process may be slightly different:

• Your boarding pass doesn’t block cancellation. You can generally cancel before departure.
• You may need to cancel via the app or website under Manage Booking, or by contacting support.
• Fees and refund rules depend on your fare, not on whether you checked in.
• Cancel before the flight leaves, because a no-show gives you fewer options.

Check the fee shown before you confirm. More on how to cancel flight ticket online is explained here.