These are two good methods, I'd use these first.
You can also do something as simple as typing into Google or your favorite search engine the airline and flight number and the current status and past/future flights that day will come up, Google also shows a tab for previous days and tomorrow.
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There's many ways...See my reply on the other thread:
https://community.southwest.com/t5/Travel-Policies/need-to-check-if-a-flight-is-on-time/m-p/166192
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