You can also use FlightAware for some flight plans. Go to "Pilot Resources", type in airport code, e.g. EGLL, click "Get Airport Info". Then click "flight tracker" in related links box. Check arrival and departure flights. For example I found a DLH A320 flight, EDMM-EGLL.GIVMI5W-GIVMI-Y101-TESGA-UL610-BATTY-UL608-LOGAN. Checking EGLL charts I found STAR BIG1E starts at LOGAN. Not all flights will show the flight plan. I have the best luck with flights originating or arriving in the UK.