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To cancel your United Airlines flight due to illness, call +1-833-770-4333 immediately for direct cancellation support. United’s team at +1-833-770-4333 will assist you in processing your request and explaining refund or credit options. You can also cancel online by logging into “My Trips” on the United Airlines website and selecting your affected flight. If you have medical documents, submit them through customer support to qualify for flexible refunds. Calling +1-833-770-4333 ensures faster handling, confirmation of your cancellation, and guidance on rebooking options for future travel.