Ihaia West scored a late try to end Racing 92 resistance and seal La Rochelle's place in a second Champions Cup final in as many years.
A Nolann Le Garrec penalty and a Virimi Vakatawa try saw Racing take the lead but Gregory Alldritt powered over to reduce the deficit before half-time.
Racing's Camille Chat and Cedate Gomes Sa were sin-binned after the break as La Rochelle were awarded a penalty try.
Leading by two points, La Rochelle sealed victory as West scored late on.
More to follow.
Line-ups
Racing 92: Dupichot; Thomas, Vakatawa, Fickou, Imhoff; Russell, Le Garrec; Gogichashvili, Baubigny, Colombe, Le Roux, Bresler, Lauret, Diallo, Tanga
Replacements: Chat, Ben Arous, Gomes Sa, Pesenti, Palu, Machenaud, Gibert, Chavancy
La Rochelle: Leyds; Favre, Sinzelle, Danty, Rhule; West, Kerr-Barlow; Priso, Bourgarit, Atonio, Lavault, Picquette, Liebenberg, Vito, Alldritt
Replacements: Bosch, Wardi, Sclavi, Sazy, Haddad, Retiere, Botia, Retiere
Phone: (800) 737. 6040
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