Key: Win : Draw : Loss
| Date | Home | Away | Ref | ||
|---|---|---|---|---|---|
| 05/08/2017 | Burton | 0 | 1 | Cardiff | G Eltringham |
| 12/08/2017 | Cardiff | 3 | 0 | Aston Villa | T Robinson |
| 15/08/2017 | Cardiff | 2 | 0 | Sheffield United | L Mason |
| 19/08/2017 | Wolves | 1 | 2 | Cardiff | S Duncan |
| 26/08/2017 | Cardiff | 2 | 1 | QPR | S Hooper |
| 09/09/2017 | Fulham | 1 | 1 | Cardiff | T Harrington |
| 12/09/2017 | Preston | 3 | 0 | Cardiff | O Langford |
| 16/09/2017 | Cardiff | 1 | 1 | Sheffield Weds | L Probert |
| 23/09/2017 | Sunderland | 1 | 2 | Cardiff | P Bankes |
| 26/09/2017 | Cardiff | 3 | 1 | Leeds | K Friend |
| 30/09/2017 | Cardiff | 0 | 0 | Derby | J Linington |
| 13/10/2017 | Birmingham | 1 | 0 | Cardiff | G Eltringham |
| 21/10/2017 | Middlesbrough | 0 | 1 | Cardiff | A Madley |
| 28/10/2017 | Cardiff | 0 | 0 | Millwall | S Martin |
| 31/10/2017 | Cardiff | 3 | 1 | Ipswich | O Langford |
| 04/11/2017 | Bristol City | 2 | 1 | Cardiff | M Jones |
| 18/11/2017 | Cardiff | 2 | 0 | Brentford | A Madley |
| 21/11/2017 | Barnsley | 0 | 1 | Cardiff | D Coote |
| 26/11/2017 | Nott'm Forest | 0 | 2 | Cardiff | P Bankes |
| 01/12/2017 | Cardiff | 3 | 1 | Norwich | A Davies |
| 11/12/2017 | Reading | 2 | 2 | Cardiff | S Martin |
| 16/12/2017 | Cardiff | 1 | 0 | Hull | S Duncan |
| 23/12/2017 | Bolton | 2 | 0 | Cardiff | D Bond |
| 26/12/2017 | Cardiff | 2 | 4 | Fulham | S Hooper |
| 29/12/2017 | Cardiff | 0 | 1 | Preston | J Linington |
| 01/01/2018 | QPR | 2 | 1 | Cardiff | T Robinson |
| 13/01/2018 | Cardiff | 4 | 0 | Sunderland | A Madley |
| 20/01/2018 | Sheffield Weds | 0 | 0 | Cardiff | R East |
| 03/02/2018 | Leeds | 1 | 4 | Cardiff | G Scott |
| 09/02/2018 | Millwall | 1 | 1 | Cardiff | K Stroud |
| 13/02/2018 | Cardiff | 2 | 0 | Bolton | T Robinson |
| 17/02/2018 | Cardiff | 1 | 0 | Middlesbrough | D Bond |
| 21/02/2018 | Ipswich | 0 | 1 | Cardiff | A Davies |
| 25/02/2018 | Cardiff | 1 | 0 | Bristol City | P Tierney |
| 06/03/2018 | Cardiff | 2 | 1 | Barnsley | R Jones |
| 10/03/2018 | Cardiff | 3 | 2 | Birmingham | P Bankes |
| 13/03/2018 | Brentford | 1 | 3 | Cardiff | J Linington |
| 30/03/2018 | Cardiff | 3 | 1 | Burton | S Hooper |
| 02/04/2018 | Sheffield United | 1 | 1 | Cardiff | S Hooper |
| 06/04/2018 | Cardiff | 0 | 1 | Wolves | M Dean |
| 10/04/2018 | Aston Villa | 1 | 0 | Cardiff | J Simpson |
| 14/04/2018 | Norwich | 0 | 2 | Cardiff | T Robinson |
| 21/04/2018 | Cardiff | 2 | 1 | Nott'm Forest | P Bankes |
| 24/04/2018 | Derby | 3 | 1 | Cardiff | A Madley |
| 28/04/2018 | Hull | 0 | 2 | Cardiff | A Davies |
| 06/05/2018 | Cardiff | 0 | 0 | Reading | R Madley |