The first eight teams of the qualification phase competed in the Championship round.

The teams took half of the points (rounded up to complete units) gained in the qualification as bonus with them.

[2] Urania Genève Sport win 2–0 on aggregate and continue to the finals.

[2] Urania Genève Sport win 7–4 on aggregate and are promoted to Nationalliga B.

[2] The play-off for the third promotion place was played on 16 June 1990 in Châtel-St-Denis.

FC Raron win 4–3 on aggregate and remain in the division.

[2] The routes of the finalists to the final, played on 4 June 1990 at the Wankdorf in Bern: PSV Eindhoven won 5–0 on aggregate.