The2018 Tercera División play-offs to Segunda División B from Tercera División (Promotion play-offs) were the final playoffs for the promotion from2017–18 Tercera División to2018–19 Segunda División B. The first four teams in each group took part in the play-off.
The eighteen group winners have the opportunity to be promoted directly toSegunda División B. The eighteen group winners were drawn into a two-legged series where the nine winners will promote to Segunda División B. The nine losing clubs will enter the play-off round for the last nine promotion spots.
The eighteen runners-up were drawn against one of the eighteen fourth-placed clubs outside their group and the eighteen third-placed clubs were drawn against one another in a two-legged series. The twenty-seven winners will advance with the nine losing clubs from thechampions' series to determine the eighteen teams that will enter the last two-legged series for the last nine promotion spots. In all the playoff series, the lower-ranked club play at home first. Whenever there is a tie in position (e.g. like the group winners in thechampions' series or the third-placed teams in the first round), a draw determines the club to play at home first.
| Team 1 | Agg.Tooltip Aggregate score | Team 2 | 1st leg | 2nd leg |
|---|---|---|---|---|
| Calahorra | 2–2(5–3p) | Atlético Levante | 1–2 | 2–1 (a.e.t.) |
| Internacional | 1–1 (a) | Tenerife B | 0–0 | 1–1 |
| Unionistas | 0–1 | Don Benito | 0–0 | 0–1 |
| Mutilvera | 1–5 | Oviedo B | 0–2 | 1–3 |
| Gimnástica Torrelavega | 6–3 | Mallorca B | 4–1 | 2–2 |
| Compostela | 2–4 | Espanyol B | 0–0 | 2–4 |
| Cádiz B | 0–1 | Teruel | 0–1 | 0–0 |
| Cultural Durango | 1–1 (a) | Conquense | 1–1 | 0–0 |
| Atlético Malagueño | 1–1 (a) | Yeclano | 0–0 | 1–1 |
| Promoted toSegunda División B | ||||||||
|---|---|---|---|---|---|---|---|---|
| Atlético Malagueño (11 years later) | Calahorra (14 years later) | Conquense (3 years later) | Don Benito (13 years later) | Espanyol B (One year later) | Gimnástica Torrelavega (5 years later) | Internacional (First time ever) | Oviedo B (16 years later) | Teruel (5 years later) |
The teams that finished fourth in their groups are drawn against teams that finished in second place, with the latter hosting the second leg. The teams that finished third in their groups are drawn against each other.
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| Team 1 | Agg.Tooltip Aggregate score | Team 2 | 1st leg | 2nd leg |
|---|---|---|---|---|
| Tropezón | 2–5 | Castellón | 1–1 | 1–4 |
| Felanitx | 0–3 | Ceuta | 0–1 | 0–2 |
| Lanzarote | 1–3 | Villarrobledo | 1–1 | 0–2 |
| Alcalá | 4–2 | San Juan | 1–0 | 3–2 |
| Salmantino | 5–4 | Poblense | 2–2 | 3–2 |
| Churra | 0–1 | Cacereño | 0–0 | 0–1 (a.e.t.) |
| Llanes | 0–3 | Portugalete | 0–0 | 0–3 |
| La Nucía | 6–6 (a) | Escobedo | 5–3 | 1–3 |
| Coria | 1–4 | Getafe B | 1–2 | 0–2 |
| Alondras | 3–5 | Langreo | 0–3 | 3–2 (a.e.t.) |
| Antequera | 0–2 | Sant Andreu | 0–1 | 0–1 |
| Sestao River | 1–2 | Arandina | 1–0 | 0–2 (a.e.t.) |
| Cirbonero | 2–2 (a) | Bergantiños | 1–0 | 1–2 |
| Terrassa | 3–0 | Mar Menor | 1–0 | 2–0 |
| Villarrubia | 2–7 | Almería B | 1–4 | 1–3 |
| Haro | 4–5 | Borja | 3–2 | 1–3 |
| Atlético Sanluqueño | 2–0 | Mensajero | 1–0 | 1–0 |
| Tarazona | 4–2 | SD Logroñés | 3–1 | 1–1 |
| Algeciras | 1–3 | Ibiza | 0–1 | 1–2 |
| L'Hospitalet | 0–3 | Náxara | 0–0 | 0–3 |
| Cristo Atlético | 1–3 | Orihuela | 0–1 | 1–2 |
| San Fernando | 3–2 | Marino Luanco | 3–1 | 0–1 |
| Jaén | 1–3 | Socuéllamos | 1–1 | 0–2 |
| Laredo | 4–6 | Alavés B | 3–2 | 1–4 |
| Ejea | 2–1 | Rayo Vallecano B | 2–0 | 0–1 |
| Racing Villalbés | 0–0(4–2p) | Atlético Pulpileño | 0–0 | 0–0 (a.e.t.) |
| Burladés | 1–7 | Plasencia | 1–2 | 0–5 |
The nine losers of the Group Winners promotion play-off plus the twenty-seven winners of the Non-champions promotion play-off first round will take part in this round. The teams will be matched by drawing of lots, subject to the fact that those who obtained the best position in the league face those who got worse, disputing the first match in the sports facilities of the latter and avoiding wherever it is possible that they compete among themselves clubs from the same group.
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| Team 1 | Agg.Tooltip Aggregate score | Team 2 | 1st leg | 2nd leg |
|---|---|---|---|---|
| Alcalá | 1–3 | Cultural Durango | 1–1 | 0–2 |
| Terrassa | 2–3 | Compostela | 2–0 | 0–3 |
| Salmantino | 3–2 | Mutilvera | 1–1 | 2–1 |
| Tarazona | 4–5 | Unionistas | 4–3 | 0–2 |
| Atlético Sanluqueño | 2–2 (a) | Mallorca B | 1–0 | 1–2 (a.e.t.) |
| Cirbonero | 1–3 | Yeclano | 1–2 | 0–1 |
| Ejea | 4–1 | Tenerife B | 2–0 | 2–1 |
| Racing Villalbés | 1–2 | Atlético Levante | 1–1 | 0–1 |
| Alavés B | 2–5 | Cádiz B | 0–2 | 2–3 |
| Plasencia | 2–3 | Portugalete | 1–2 | 1–1 |
| Ibiza | 1–0 | Getafe B | 0–0 | 1–0 |
| Orihuela | 2–2(5–4p) | Ceuta | 1–1 | 1–1 (a.e.t.) |
| San Fernando | 1–0 | Borja | 1–0 | 0–0 |
| Náxara | 2–6 | Langreo | 2–1 | 0–5 |
| Socuéllamos | 5–0 | Cacereño | 1–0 | 4–0 |
| Castellón | 1–1 (a) | Sant Andreu | 0–0 | 1–1 |
| Escobedo | 1–4 | Villarrobledo | 0–3 | 1–1 |
| Arandina | 2–3 | Almería B | 0–0 | 2–3 |
The eighteen winners of the previous qualifying round will be matched by drawing of lots, subject to the fact that those who obtained the best position in the league face those who got worse, disputing the first match in the sports facilities of the latter and avoiding wherever it is possible that they compete among themselves clubs from the same group.
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| Team 1 | Agg.Tooltip Aggregate score | Team 2 | 1st leg | 2nd leg |
|---|---|---|---|---|
| Atlético Sanluqueño | 6–2 | Yeclano | 3–0 | 3–2 |
| Salmantino | 2–1 | Compostela | 1–1 | 1–0 |
| San Fernando | 0–3 | Cultural Durango | 0–1 | 0–2 |
| Ibiza | 1–1(3–4p) | Atlético Levante | 1–0 | 0–1 (a.e.t.) |
| Socuéllamos | 2–3 | Unionistas | 1–0 | 1–3 |
| Ejea | 3–3 (a) | Cádiz B | 1–1 | 2–2 |
| Orihuela | 2–2 (a) | Langreo | 2–1 | 0–1 |
| Portugalete | 1–2 | Castellón | 1–1 | 0–1 |
| Villarrobledo | 3–8 | Almería B | 3–6 | 0–2 |
| Promoted toSegunda División B | ||||||||
|---|---|---|---|---|---|---|---|---|
| Almería B (2 years later) | Atlético Levante (One year later) | Atlético Sanluqueño (One year later) | Castellón (7 years later) | Cultural Durango (12 years later) | Ejea (First time ever) | Langreo (3 years later) | Salmantino (First time ever) | Unionistas (First time ever) |