Real Unión de Irún played 54 league seasons and cup tournaments in the data, 1911 to 2023, winning 4 domestic cups. Success weighs every finish by how hard that competition was to win; Efficiency is the share of what the club could have won that it did win; Edge compares that with an average participant (×1.00).
| Competition | Won | Seasons |
|---|---|---|
| Copa del Rey (and predecessors) | 4 | 1913 (Federación), 1918, 1924, 1927 |
| 879 | Londrina (Brazil) | 2.1 |
| 880 | Oriente Petrolero (BOL) | 2.1 |
| 881 | Rentistas (Uruguay) | 2.1 |
| 882 | Real Unión de Irún (Spain) | 2.1 |
| 883 | Karşıyaka (Turkey) | 2.0 |
| 884 | Almagro (Argentina) | 2.0 |
| 885 | Rad Beograd (Serbia) | 2.0 |
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