B737-700
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 188
Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Flight Crew Diverted; Flight Crew Landed in Emergency Condition; General Declared Emergency
Aircraft
While at cruise at FL380; the FAs called and reported odor of smoke in cabin and said it was getting worse. We started Smoke/Fire/Fumes on Aircraft Checklist and notified ATC that we were diverting to ZZZ. Upon landing at ZZZ; we exited the runway and shut down the engines and fire rescue performed a check of the aircraft. Upon being cleared by fire rescue; we taxied to the gate and deplaned the Passengers and Crew. Fire rescue then performed a cabin inspection and were unable to identify the source.
B737-700 Captain reports diverting to the nearest suitable airport when the flight attendants report smoke in the cabin. QRH procedures are complied with.