24 hours Summary. Yes , +1-855-778-4705 𝕌𝕊 - 𝕆𝕋𝔸 Alaska Airlines allows you to cancel flights up to 24 hours before departure for a full refund, provided you meet fare conditions. For cancellations +1-855-778-4705 𝕌𝕊 - 𝕆𝕋𝔸 within 24 hours of the flight, fees may apply depending on the ticket type.