Beauciphus writes:

Yet you use an incorrect procedure for getting the altimeter setting at the
destination field.

What is the correct procedure, then?

In simulation, you can press B to get the current altimeter setting. Offline,
you can listen to the ATIS of the nearest field. Online, you can ask ATC or
check the current ATIS or METAR of the nearest field.

For the destination field, you can tune the ATIS if it's within range and you
are offline (sometimes online also), or you can ask ATC, or you can check the
current METAR (online).