Hi, I am looking for a web site or app when I can show airports, a flight plan and weather overlays (including clouds). Basically I am hoping to have a one stop flight planner. Thanks in advance.

quite some options and some new kids leaking around the corner. But atm simbrief.com is the de facto standard, and gives you everything you've been asking for.
You'll need to register an account with Navigraph, but don't need a payed subscription to use simbrief.

Thanks joergalv, I had a look at Simbrief, seems more for use by tubeliners. As I usually fly GA aircraft in VFR conditions, it's probably a bit much for me, plus you need to pay for cloud coverage.

I use Littlenavmap but unfortunately it does not have cloud overlays.

https://skyvector.com/

Thanks. I am now using this web site:  https://flightinfo.app/leafmap.php