| Season | League | Apps | Min | Goals | Assists | G+A / 90 | Rating |
|---|---|---|---|---|---|---|---|
| 2017 | Kakkonen | 11 | 786 | 3 | 0 | 0.34 | — |
| 2017 | Kakkonen-LohkoC | 10 | 375 | 2 | 0 | 0.48 | — |
| 2018 | Kakkonen | 1 | 86 | 0 | 0 | — | — |
| 2018 | Kakkonen-LohkoC | 11 | 963 | 4 | 0 | 0.37 | — |
| 2019 | Veikkausliiga | 8 | 81 | 0 | 0 | — | — |
| 2019 | Kakkonen | 15 | 1268 | 9 | 0 | 0.64 | — |
| 2020 | Veikkausliiga | 7 | 220 | 0 | 0 | 0 | — |
| 2020 | Kakkonen | 6 | 523 | 5 | 0 | 0.86 | — |
| 2021 | Veikkausliiga | 13 | 569 | 1 | 1 | 0.32 | — |
| 2021 | Kakkonen | 1 | 90 | 1 | 0 | 1 | — |
| 2022 | Veikkausliiga | 18 | 856 | 1 | 0 | 0.11 | — |
| 2022 | Kakkonen | 1 | 90 | 0 | 0 | 0 | — |
| 2023 | Veikkausliiga | 20 | 698 | 5 | 1 | 0.77 | 7.08 |
| 2024 | Veikkausliiga | 21 | 706 | 4 | 0 | 0.51 | 6.8 |
| 2025 | Veikkausliiga | 17 | 609 | 0 | 2 | 0.3 | 6.74 |
| 2026 | Veikkausliiga | 12 | 321 | 1 | 0 | 0.28 | 6.62 |
Domestic league competitions only (SportMonks sub_type='domestic'); national-team, continental and cup competitions are excluded. Classification resolved by league id against the canonical leagues index. G+A/90 computed from minutes actually played.
Figures computed from the GioScore season-stats database · as of 2026-08-26
Player stats against each opponent club
| Team | MP | W | D | L | G | A | ||
|---|---|---|---|---|---|---|---|---|
 HJK | 7 | 3 | 3 | 1 | 0 | 0 | 0 | 0 |
 Inter Turku | 6 | 1 | 3 | 2 | 0 | 0 | 0 | 0 |
 Ilves | 6 | 3 | 0 | 3 | 0 | 0 | 1 | 0 |
 Mariehamn | 5 | 3 | 1 | 1 | 0 | 0 | 0 | 0 |
 Haka | 5 | 3 | 1 | 1 | 1 | 1 | 0 | 0 |
 Oulu | 4 | 2 | 1 | 1 | 2 | 0 | 0 | 0 |
 Gnistan | 4 | 3 | 1 | 0 | 0 | 1 | 1 | 0 |
 SJK | 3 | 2 | 1 | 0 | 0 | 0 | 0 | 0 |
 HIFK | 3 | 2 | 1 | 0 | 1 | 0 | 0 | 0 |
 VPS | 3 | 1 | 1 | 1 | 0 | 0 | 0 | 0 |
 EIF | 3 | 3 | 0 | 0 | 0 | 0 | 1 | 0 |
 Lahti | 3 | 3 | 0 | 0 | 0 | 0 | 0 | 0 |
 KTP | 3 | 3 | 0 | 0 | 2 | 0 | 1 | 0 |
 Honka | 3 | 2 | 0 | 1 | 0 | 0 | 0 | 0 |
 Kairat | 2 | 1 | 0 | 1 | 0 | 0 | 0 | 0 |
 Milsami | 2 | 1 | 1 | 0 | 0 | 0 | 0 | 0 |
 TP-47 | 2 | 1 | 0 | 1 | 2 | 0 | 0 | 0 |
 GBK | 2 | 1 | 1 | 0 | 1 | 0 | 1 | 0 |
 Molde | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 |
 Kajaani | 1 | 0 | 1 | 0 | 0 | 0 | 1 | 0 |
All of Arttu Heinonen's 2026 Veikkausliiga output came as goals: 1 goal in 12 games (321 minutes) — 0.28 goal involvements per 90. GioScore's computed rating for the season averages 6.62.
Season ratings peak at 7.08 in 2023, Veikkausliiga and bottom out at 6.62 in 2026. Compared with his earlier career average, the last two rated seasons are down by 0.26.
