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