To request a refund from Norwegian Cruise Line (NCL), you can use the Case Submission Form on their website or contact them by phone+1-855-732-4023. You'll need to provide your reservation information, details of your request, and any supporting documentation like proof of payment and a copy of the cancellation or delay notice+1-855-732-4023. NCL will review your request and respond within 180 days, potentially offering alternatives like a future cruise credit.