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For international flight issues, please use
Consolidated delayed/cancelled international flights (2022)

Information resources:
UA Flight Status
FlightAware / Flightstats (flight details)
Cancelled Flights (FlightAware)
Diverted Flights

previous domestic delay / cancelled flight report threads
Consolidated cancelled/delayed domestic flights [2021]
Consolidated cancelled/delayed domestic flights [2020]
Consolidated cancelled/delayed domestic flights [2019]
Consolidated cancelled/delayed domestic flights [2018]
Consolidated cancelled/delayed domestic flights [2017]
Consolidated cancelled/delayed domestic flights [2016]
Consolidated cancelled/delayed domestic flights [2015]
Consolidated cancelled/delayed domestic flights [2014]

If you need documentation of delay / cancellation for trip insurance or refunds from hotel / tour / .... operator, try this link
Quote:
Verification letters
Upon request, we can provide a statement of proof that a United flight was delayed or canceled. You may email your request to [email protected]. Be sure to include the names of all customers in your party, confirmation number, flight numbers and dates of travel, phone contact and the email address or mailing address where you would like it sent. Please allow 5-10 business days for processing.
[email protected], response in 30 business days