This sight will give you when the ISS or Space Shuttle will be overhead around sunset or sunrise. It will give you the times, duration and direction to look. These times are after sunset or just before dawn, that way the ISS is illuminated by the sun against a dark sky. Very easy to see. My kids watch for this at least once a week. Great fun to see it go by.

Look on the left side under the "Sighting Opportunities" banner, select country, then state and finally nearest city.

Human Space Flight (HSF) - Realtime Data

Looks like a star moving across the sky,
Enjoy