Saint-Quentin Fallavier was part of the new town of L'Isle d'Abeau transformed in 2007 into the Communauté d'agglomération Porte de l'Isère (CAPI).

At the end of the border conflict between Savoy and Dauphiné, the castle was gradually abandoned in favour of the fortified house of Allinges.

By a presidential decree of 2 July 1885, Fallavier was attached to Saint-Quentin to form a single commune: Saint-Quentin-Fallavier.

[6] The commune is served by: Passage through Saint-Quentin-Fallavier by a rail bypass of the Lyon agglomeration (CFAL [fr]) is still under consideration.

Saint-Quentin-Fallavier has an industrial and logistics platform which is considered of international importance and which continues to grow, with traffic estimated at 5,000 HGVs per day and 1,500,000 square metres (16,000,000 sq ft) of warehouses in early 2007.

Logistics activity benefits from the presence of the A43 interchange, proximity to Lyon–Saint-Exupéry Airport, and the Lyon-Grenoble Line [fr] of the SNCF.