B737 captain reported flight attendant reported air leak at cabin main entry door after takeoff.

Attributes
ACN	1659920
Time
Date	201906
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Exterior Pax/Crew Door
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 190 Flight Crew Type 4677
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Ground Event / Encounter Other / Unknown

Narrative:

During climb out flight attendant reported a loud 'rushing air' noise coming from main cabin door 1L. Cockpit indications were all normal. After inspection by cockpit crew it appeared that the main cabin door was improperly closed on the ground. Right side interior main cabin door hinge cover was out of place not allowing the cabin door to properly seal. Coordinated with dispatch to return to ZZZ so maintenance technicians could inspect door. After returning to ZZZ; maintenance found door to have been improperly closed. Corrective action: close door properly; no further action required. After discussion with dispatch and maintenance technicians; aircraft was refueled; re-released; new [maintenance document] signed-off; and proceeded to ZZZ1 without further incident.

Original NASA ASRS Text

Title: B737 Captain reported Flight Attendant reported air leak at cabin Main Entry Door after takeoff.

Narrative: During climb out Flight Attendant reported a loud 'rushing air' noise coming from Main Cabin Door 1L. Cockpit indications were all normal. After inspection by cockpit crew it appeared that the main cabin door was improperly closed on the ground. Right side interior main cabin door hinge cover was out of place not allowing the cabin door to properly seal. Coordinated with Dispatch to return to ZZZ so Maintenance Technicians could inspect door. After returning to ZZZ; Maintenance found door to have been improperly closed. Corrective action: close door properly; no further action required. After discussion with Dispatch and Maintenance Technicians; aircraft was refueled; re-released; new [Maintenance document] signed-off; and proceeded to ZZZ1 without further incident.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.