Silas (Acts 15:40) Timothy was added at Lystra Acts 16:1-3. Luke is the recognized author of Acts and has references later in chapter 16 that use the pronoun "we" so he was apparently with them on this trip.
Timothy was Pauls companion on the second missionary journey.
timothy
1 and 2 Thessalonians were written during Paul's Second Missionary Journey.
49 AD
Paul visited Athens and Corinth on the Second Missionary Journey. He also visited Corinth on the Third Missionary Journey.
Paul's second missionary journey was to Greece A.D. 50-53.
approximately 1,400 miles
Paul received the "Macedonian call" while on his second missionary journey. His first trip to Europe was in response to this call. You can read about when Paul started his second missionary journey in Acts 15:36-41, and when Paul received the "Macedonian call" in Acts 16:6-11, and read about the first convert in Europe in Acts 16:14-15.
Missionary
Barnabas accompanied Paul.
During Paul's second missionary journey he spent 1 year and 6 months at Corinth.
Timotheus
I think its in Antioch