- Oakhurst to Mercure Sydney International Airport
- Oakville to Mercure Sydney International Airport
- Oatlands to Mercure Sydney International Airport
- Oatley to Mercure Sydney International Airport
- Old Guildford to Mercure Sydney International Airport
- Old Toongabbie to Mercure Sydney International Airport
- Oran Park to Mercure Sydney International Airport
- Orchard Hills to Mercure Sydney International Airport
- Oxford Falls to Mercure Sydney International Airport
- Oxley Park to Mercure Sydney International Airport
- Oyster Bay to Mercure Sydney International Airport
- Sydney Airport to Mercure Sydney International Airport
- Mercure Sydney International Airport to Oakhurst
- Mercure Sydney International Airport to Oakville
- Mercure Sydney International Airport to Oatlands
- Mercure Sydney International Airport to Oatley
- Mercure Sydney International Airport to Old Guildford
- Mercure Sydney International Airport to Old Toongabbie
- Mercure Sydney International Airport to Oran Park
- Mercure Sydney International Airport to Orchard Hills
- Mercure Sydney International Airport to Oxford Falls
- Mercure Sydney International Airport to Oxley Park
- Mercure Sydney International Airport to Oyster Bay
- Mercure Sydney International Airport to Sydney Airport