Acts 18:18 states that Paul left Corinth with Priscilla and Aquila and sailed toward Syria after having his hair cut at Cenchrea because of a vow. The harbor therefore formed part of the transportation network used during Paul's missionary travels.
Cenchrea is even more significant in Romans 16:1-2, where Paul commends Phoebe to the Roman Christians and identifies her with the church at Cenchreae. He asks believers in Rome to receive and assist her.
This reference demonstrates that Christianity had spread beyond the city of Corinth itself and that a distinct congregation existed at its eastern port.