A319
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Flight Crew Last 90 Days 94; Flight Crew Total 587; Flight Crew Type 587
Aircraft Equipment Problem Less Severe; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Air Traffic Control Provided Assistance; Flight Crew Diverted; Flight Crew Landed in Emergency Condition; Flight Crew Requested ATC Assistance / Clarification; General Maintenance Action
Aircraft
Approximately 3 hours into the flight; when performing pre-descent bathroom break; the flight attendants informed us of fuel/fumes smell mid-cabin over the wings near the exit row. The smell was not noticeable on the flight deck or at other locations in the cabin; and no passengers were expressing any concerns or discomfort. First Officer stepped back to verify and reported it as a petroleum type smell. We contacted Dispatch and Maintenance via radio. There wasn't any noticeable fuel loss or fuel burn.  As a precaution we placed the Pack into High Flow; [advised ATC]; and proceeded to ZZZ (closest suitable airfield). We reviewed the smoke/fumes checklist as a precaution in case the fumes became perceptible on the flight deck (it never did). Pilot Flying donned the O2 as a precaution only. Flight attendants were instructed to review cabin prep/evac procedures but not the prep the cabin. Passengers were not informed of anything unusual/abnormal.We executed a day VMC landing at ZZZ with approach control ATC guidance. We cleared the runway and proceeded to the gate with [Crash Fire Rescue] following.
A319 Captain reported a fumes event during cruise that resulted in a diversion.