How do I locate my iPhone if it is offline

No, sorry.

Reading the following support guide you can find what you can do:

If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support

Regards

Giulio

dm0661230 wrote:

I lost my phone and run tracking on find my phone is its offline is there anything I can do to still track it

Sorry no.

To track all below must be true:

1. Find My iPhone is ON before the lost

2. iPhone has Internet connection

3. iPhone is not switched OFF

4. iPhone battery is not dead