01 July - United Express
Flight Number: UA6122
Registration: Unknown
Route: Washington Reagan National/Houston Bush International
Smoke in cockpit and cabin. Aircraft evacuated.
03 July - Iberia
Flight Number: IB3214
Registration: EC-JFN Airbus A320-200
Route: Madrid/Brussels
Strong burning odour in the cockpit and smoke emanating from the air conditioning vents. Returned to Madrid.
03 July - Air Greenland
Flight Number: GL 784 (02 July)
Registration: OY-GRN Airbus A330-200
Route: Kangerlussuaq/Copenhagen
Unusual odour in galley. Diverted to Keflavik (Iceland).
04 July - Allegiant
Flight Number: G4-101
Registration: N225NV Airbus A320-200
Route: Cedar Rapids/Phoenix Mesa
Smoke in cockpit. Returned to Cedar Rapids.
05 July - EasyJet
Flight Number: U2 2963
Registration: G-EZOM Airbus A320-200
Route: Milan Malpensa/Heraklion
Smoke in cabin. Returned to Milan Malpensa.
09 July - Expressjet
Flight Number: UA4632
Registration: N12136 Embraer ERJ-145
Route: Denver/Fargo
Smoke in cockpit.
11 July - Virgin Atlantic (Occurred on 24 June 2018. Published - 11 July)
Flight Number: VS 110
Registration: G-VLNM Airbus A330-200
Route: Atlanta/Manchester
Odour in one of the galley areas. Diverted to Boston.
11 July - Lufthansa
Flight Number: LH1626
Registration: D-AILA Airbus A319-100
Route: Munich/Krakow
Smell after departure. Returned to Munich.
13 July - Brussels Airlines
Flight Number: SN3765
Registration: OO-SSI Airbus A319-100
Route: Brussels/Palma
Unusual odour in cockpit. Diverted to Toulouse.
22 July - First Air
Flight Number: 7F-803
Registration: C-GKLB Avions De Transport Regional ATR-42-300
Route: Igloolik/Iqualuit (Canada)
Smoke in cockpit. Returned to Igloolik.
22 July - United Airlines
Flight Number: UA1611
Registration: Unknown
Route: Newark/Chicago
Smoke in cabin.
23 July - British Airways
Flight Number: BA 864
Registration: G-EUYC Airbus A320-200
Route: London Heathrow/Warsaw
‘A passenger reported the crew announced they had fumes onboard, the crew was unable to identify the source, they would therefore return to London.’ - Aviation Herald.
26 July - Spirit Airlines
Flight Number: NK 779
Registration: N675NK Airbus A320-200
Route: New York La Guardia/Fort Lauderdale
Odour onboard. Diverted to Myrtle Beach. 10 people transported to hospital with headaches, respiratory and stomach problems.
29 July - WIZZ Air
Flight Number: W6-3401
Registration: HA-LYA Airbus A320-200
Route: Cluj (Romania)/Madrid
Smell of smoke in the cabin. Diverted to Milan.
Update:
04 July - Swiss- LX7288 A330-300 Zurich/Johannesburg - Nasty odour onboard. Returned to Zurich.