The quicker you file your claim and provide supporting documentation, the sooner you'll receive eligible compensation. Compensation involving EU 261/2004 requires the airline to refund you upon cancellation within seven days. If the airline doesn't resolve your request for compensation within two months, you can lodge a complaint with the national authority where the delay or cancellation took place. Reimbursement through a credit card may take much longer, since most claims are handled by a third-party claims administrator.