Usol'ye-Sibirskoye is a provincial town and has no airport. That is why to get to Tamworth, you need to reach a larger city close to Usol'ye-Sibirskoye first, from there you'll be able to fly.
It is impossible to buy direct flights Usol'ye-Sibirskoye — Tamworth, because the former does not have an airport. However, pretty close the following airports are to be found:
Find the best accommodation in Tamworth on hotels.anywayanyday.com: search for hotels by price, popularity, trip ranking, accommodation type and rendered services.