All available race results Alfdan de Decker
| Date | Race | Rank |
| 27/09 | Gooikse Pijl | 133 |
Rider information for 2015
Rider Alfdan de Decker is not classified in 2015.
No results available in season 2016.
Rider information for 2016
| Rank | 1318 |
| Score | 17 |
| Name | Alfdan DE DECKER |
| Country | Belgium |
| Team | Elite without contract |
| Date | Race | Rank |
| 24/09 | Gooikse Pijl | 90 |
Rider information for 2017
| Rank | 2041 |
| Score | 7 |
| Name | Alfdan DE DECKER |
| Country | Belgium |
| Team | Elite without contract |
| Date | Race | Rank |
| 21/08 | G.P. Stad Zottegem | 63 |
| 24/08 | Great War Remembrance Race | 62 |
| 26/08 | Schaal Sels | 2 |
Rider information for 2018
| Rank | 804 |
| Score | 56 |
| Name | Alfdan DE DECKER |
| Country | Belgium |
| Team | Wanty - Groupe Gobert |
| Date | Race | Rank |
| 03/02 | Trofeo Playa de Palma | 141 |
| Etoile de Bessèges | ||
| 07/02 | Stage 1 | 17 |
| Tour of Oman | ||
| 16/02 | Stage 1 | 40 |
| 17/02 | Stage 2 | 124 |
| 22/03 | Bredene - Koksijde Classic | 18 |
| 27/03 | Driedaagse Brugge-De Panne | 115 |
| Giro di Sicilia | ||
| 03/04 | Stage 1 | 109 |
| 04/04 | Stage 2 | 115 |
| 05/04 | Stage 3 | 101 |
| 26/05 | Grote Prijs Marcel Kint | 3 |
| 10/06 | Ronde van Limburg | 8 |
| 22/06 | Heylen Vastgoed Heistse Pijl | 23 |
| 23/06 | Elfstedenronde | 98 |
| 21/08 | Veenendaal - Veenendaal Classic | 74 |
| Tour du Poitou-Charentes en Nouvelle Aquitaine | ||
| 27/08 | Stage 1 | 83 |
| 28/08 | Stage 2 | 39 |
| 29/08 | Stage 3 | 55 |
| 29/08 | Stage 4 | 107 |
| 08/09 | G.P. de Fourmies | 46 |
| 20/09 | Kampioenschap van Vlaanderen - Koolskamp | 97 |
Rider information for 2019
| Rank | 1109 |
| Score | 25 |
| Name | Alfdan DE DECKER |
| Country | Belgium |
| Team | Wanty - Gobert Cycling Team |
| Date | Race | Rank |
| 30/01 | Trofeo Ses Salines - Felanitx | 17 |
| 02/02 | Trofeo Playa de Palma | 92 |
| Etoile de Bessèges | ||
| 05/02 | Stage 1 | 78 |
| 06/02 | Stage 2 | 88 |
| 07/02 | Stage 3 | 119 |
| 08/02 | Stage 4 | 109 |
| 16/02 | Clásica de Almería | 20 |
| 08/03 | G.P. Jean-Pierre Monseré | 3 |
| 05/08 | Milano - Torino | 107 |
| Tour du Limousin | ||
| 18/08 | Stage 1 | 86 |
| 19/08 | Stage 2 | 110 |
| 20/08 | Stage 3 | 121 |
| 21/08 | Stage 4 | 72 |
| General Classification | 84 | |
| Tour du Poitou-Charentes en Nouvelle Aquitaine | ||
| 27/08 | Stage 1 | 122 |
| 29/08 | Stage 3a | 67 |
| 29/08 | Stage 3b | 114 |
| 30/08 | Stage 4 | 8 |
| General Classification | 85 | |
| 20/09 | Gooikse Pijl | 17 |
| 27/09 | Paris - Chauny | 113 |
| 11/10 | Paris - Tours | 111 |
| 14/10 | Scheldeprijs - Schoten | 19 |
Rider information for 2020
| Rank | 832 |
| Score | 26 |
| Name | Alfdan DE DECKER |
| Country | Belgium |
| Team | Circus - Wanty - Gobert |
| Date | Race | Rank |
| 07/03 | G.P. Jean-Pierre Monseré | 45 |
| 17/03 | Nokere Koerse | 38 |
| 19/03 | Bredene - Koksijde Classic | 40 |
| Volta a la Comunitat Valenciana | ||
| 14/04 | Stage 1 | 108 |
| 15/04 | Stage 2 | 16 |
| 16/04 | Stage 3 | 106 |
| 17/04 | Stage 4 | 108 |
| 18/04 | Stage 5 | 14 |
| General Classification | 101 | |
| Tour du Rwanda | ||
| 02/05 | Stage 1 | 9 |
| 03/05 | Stage 2 | 72 |
| 04/05 | Stage 3 | 60 |
| 05/05 | Stage 4 | 66 |
| 06/05 | Stage 5 | 66 |
| 07/05 | Stage 6 | 61 |
| 08/05 | Stage 7 | 60 |
| 29/05 | G.P. Herning | 40 |
| 30/05 | Fyen Rundt | 20 |
| 06/06 | Elfstedenronde | 114 |
| Baloise Belgium Tour | ||
| 09/06 | Stage 1 | 82 |
| 10/06 | Stage 2 | 143 |
| 11/06 | Stage 3 | 23 |
| 12/06 | Stage 4 | 120 |
| 13/06 | Stage 5 | 72 |
| General Classification | 110 | |
| Tour de Wallonie | ||
| 20/07 | Stage 1 | 164 |
| 21/07 | Stage 2 | 41 |
| 31/07 | Heylen Vastgoed Heistse Pijl | 97 |
| 17/08 | Egmont Cycling Race - Zottegem | 67 |
| 20/08 | Grote Prijs Marcel Kint | 17 |
| 12/09 | Antwerp Port Epic | 27 |
| 17/09 | Kampioenschap van Vlaanderen - Koolskamp | 37 |
| 19/09 | Gooikse Pijl | 29 |
Rider information for 2021
| Rank | 2553 |
| Score | 3 |
| Name | Alfdan DE DECKER |
| Country | Belgium |
| Team | Tarteletto - Isorex |