| 2018-07-25 19:30:00July 25, 2018 | Zamudio 0-1 Bilbao Athletic | 0 - 1 | Friendly | 2018/2019 | Recap |
| 2018-07-28 12:00:10July 28, 2018 | Bilbao Athletic 3-0 Arenas Club | 3 - 0 | Friendly | 2018/2019 | Recap |
| 2018-08-01 12:00:37August 1, 2018 | Burgos 1-1 Bilbao Athletic | 1 - 1 | Friendly | 2018/2019 | Recap |
| 2018-08-04 12:00:32August 4, 2018 | Barakaldo 1-1 Bilbao Athletic | 1 - 1 | Friendly | 2018/2019 | Recap |
| 2018-08-08 12:00:03August 8, 2018 | Ebro 1-3 Bilbao Athletic | 1 - 3 | Friendly | 2018/2019 | Recap |
| 2018-08-11 12:00:09August 11, 2018 | Tudelano 1-1 Bilbao Athletic | 1 - 1 | Friendly | 2018/2019 | Recap |
| 2018-08-15 12:00:24August 15, 2018 | Cultural Durango 0-3 Bilbao Athletic | 0 - 3 | Friendly | 2018/2019 | Recap |
| 2018-08-18 19:30:27August 18, 2018 | Ponferradina 4-0 Bilbao Athletic | 4 - 0 | Friendly | 2018/2019 | Recap |
| 2018-08-26 12:00:06August 26, 2018 | Bilbao Athletic 2-0 Tudelano | 2 - 0 | Segunda B | 2018/2019 | Recap |
| 2018-09-01 12:00:38September 1, 2018 | Gimnástica 0-0 Bilbao Athletic | 0 - 0 | Segunda B | 2018/2019 | Recap |
| 2018-09-08 17:30:40September 8, 2018 | Bilbao Athletic 3-1 Amorebieta | 3 - 1 | Segunda B | 2018/2019 | Recap |
| 2018-09-15 11:00:47September 15, 2018 | Leioa 1-4 Bilbao Athletic | 1 - 4 | Segunda B | 2018/2019 | Recap |
| 2018-09-22 19:00:53September 22, 2018 | Bilbao Athletic 3-0 Gernika Club | 3 - 0 | Segunda B | 2018/2019 | Recap |
| 2018-09-29 16:30:02September 29, 2018 | Real Oviedo B 1-1 Bilbao Athletic | 2 - 1 | Segunda B | 2018/2019 | Recap |
| 2018-10-06 17:30:15October 6, 2018 | Bilbao Athletic 0-0 Logroñés | 0 - 0 | Segunda B | 2018/2019 | Recap |
| 2018-10-13 16:00:53October 13, 2018 | Real Sociedad B 1-0 Bilbao Athletic | 1 - 0 | Segunda B | 2018/2019 | Recap |
| 2018-10-20 17:00:57October 20, 2018 | Bilbao Athletic 1-3 Mirandés | 1 - 3 | Segunda B | 2018/2019 | Recap |
| 2018-10-27 19:00:52October 27, 2018 | Arenas Club 1-0 Bilbao Athletic | 1 - 0 | Segunda B | 2018/2019 | Recap |
| 2018-11-03 16:00:08November 3, 2018 | Bilbao Athletic 6-0 Izarra | 6 - 0 | Segunda B | 2018/2019 | Recap |
| 2018-11-11 17:00:10November 11, 2018 | Racing Santander 3-1 Bilbao Athletic | 3 - 1 | Segunda B | 2018/2019 | Recap |
| 2018-11-17 17:00:45November 17, 2018 | Bilbao Athletic 2-2 Cultural Durango | 2 - 2 | Segunda B | 2018/2019 | Recap |
| 2018-11-25 17:00:06November 25, 2018 | Barakaldo 1-1 Bilbao Athletic | 1 - 1 | Segunda B | 2018/2019 | Recap |
| 2018-12-01 17:00:20December 1, 2018 | Bilbao Athletic 5-1 Langreo | 5 - 1 | Segunda B | 2018/2019 | Recap |
| 2018-12-09 12:00:35December 9, 2018 | Sporting B 3-1 Bilbao Athletic | 3 - 1 | Segunda B | 2018/2019 | Recap |
| 2018-12-15 17:00:34December 15, 2018 | Bilbao Athletic 3-2 Calahorra | 3 - 2 | Segunda B | 2018/2019 | Recap |
| 2018-12-22 16:30:45December 22, 2018 | Real Unión 1-0 Bilbao Athletic | 1 - 0 | Segunda B | 2018/2019 | Recap |
| 2019-01-05 16:00:41January 5, 2019 | Bilbao Athletic 2-0 Vitoria | 2 - 0 | Segunda B | 2018/2019 | Recap |
| 2019-01-13 12:00:26January 13, 2019 | Tudelano 3-2 Bilbao Athletic | 3 - 2 | Segunda B | 2018/2019 | Recap |
| 2019-01-19 19:00:00January 19, 2019 | Bilbao Athletic 1-0 Gimnástica | 1 - 0 | Segunda B | 2018/2019 | Recap |
| 2019-01-26 16:30:50January 26, 2019 | Amorebieta 3-2 Bilbao Athletic | 3 - 2 | Segunda B | 2018/2019 | Recap |
| 2019-02-03 17:00:45February 3, 2019 | Bilbao Athletic 2-1 Leioa | 2 - 1 | Segunda B | 2018/2019 | Recap |
| 2019-02-09 18:00:49February 9, 2019 | Gernika 2-1 Bilbao Athletic | 2 - 1 | Segunda B | 2018/2019 | Recap |
| 2019-02-16 16:00:27February 16, 2019 | Bilbao Athletic 4-1 Real Oviedo B | 4 - 2 | Segunda B | 2018/2019 | Recap |
| 2019-02-23 17:30:20February 23, 2019 | Logroñés 2-1 Bilbao Athletic | 1 - 2 | Segunda B | 2018/2019 | Recap |
| 2019-03-02 16:00:05March 2, 2019 | Bilbao Athletic 2-2 Real Sociedad B | 2 - 2 | Segunda B | 2018/2019 | Recap |
| 2019-03-10 17:00:50March 10, 2019 | Mirandés 1-1 Bilbao Athletic | 1 - 1 | Segunda B | 2018/2019 | Recap |
| 2019-03-17 11:00:01March 17, 2019 | Bilbao Athletic 2-1 Arenas Club | 2 - 1 | Segunda B | 2018/2019 | Recap |
| 2019-03-24 17:00:50March 24, 2019 | Izarra 0-0 Bilbao Athletic | 0 - 0 | Segunda B | 2018/2019 | Recap |
| 2019-03-30 17:00:33March 30, 2019 | Bilbao Athletic 1-1 Racing Santander | 1 - 1 | Segunda B | 2018/2019 | Recap |
| 2019-04-06 18:00:16April 6, 2019 | Cultural Durango 3-2 Bilbao Athletic | 3 - 2 | Segunda B | 2018/2019 | Recap |
| 2019-04-13 18:00:56April 13, 2019 | Bilbao Athletic 4-1 Barakaldo | 4 - 1 | Segunda B | 2018/2019 | Recap |
| 2019-04-18 12:00:35April 18, 2019 | Langreo 0-2 Bilbao Athletic | 0 - 2 | Segunda B | 2018/2019 | Recap |
| 2019-04-28 11:30:29April 28, 2019 | Bilbao Athletic 0-2 Sporting B | 0 - 2 | Segunda B | 2018/2019 | Recap |
| 2019-05-05 18:00:35May 5, 2019 | Calahorra 0-3 Bilbao Athletic | 0 - 3 | Segunda B | 2018/2019 | Recap |
| 2019-05-12 18:00:16May 12, 2019 | Bilbao Athletic 2-0 Real Unión | 2 - 0 | Segunda B | 2018/2019 | Recap |
| 2019-05-19 18:00:01May 19, 2019 | Vitoria 0-0 Bilbao Athletic | 0 - 0 | Segunda B | 2018/2019 | Recap |