From Glasgow

Getting from Glasgow Airport to the city centre:

By Bus:

First 500 Glasgow shuttle Bus – Airport to city centre from stance 1

There are also usually plenty of taxis available too.

Getting to Stirling from Glasgow

By Bus:

There are regular Megabus and Citylink buses going from Buchanan Street Bus Station, Glasgow to Goosecroft Bus Station, Stirling.
Prices will vary, but taking the bus is usually cheaper than taking the train. The journey takes approximately 40-45 minutes.
You can get more information and buy tickets at their websites:

Megabus – uk.megabus.com
Citylink – www.citylink.co.uk

By Train:

There are dozens of trains running from Queen Street Train Station to Stirling Train Station everyday.
Prices will vary. The journey can take between 25-45 minutes.
You can get more information and buy tickets at the National Rail website – www.nationalrail.co.uk