Apologies if this has been reported here before, but I can't find a good way to check since every term in the search produces a million hits!

If you go to the flight status tab on ua.com and key in your flight number, the results returned include a wealth of details that are otherwise hard (or impossible) to find. For basic information it doesn't matter that you have the exact date since most details don't change from day to day.

Things reported include:

flight time
aircraft
miles earned
meals
departure and arrival time

quick, easy, and all in one place!