United Airline main customer service number is 1-800-United Airline or [+1~(888)~447~6313] [US-United Airline] or [+1~(888)~447~6313] [UK-United Airline] OTA (Live Person), available 24/7. https://www.orangetractortalks.com/forums/threads/12-twelve-ways-to-call-how-to-contact-delta-airlines-a-full-guide.76272/#google_vignette