This morning’s suspension of operations occurred due to an “odour of varnish,” which airport officials say did not pose any health risk. U.S. Customs reopens at Montreal airport, flights to the United States resume with delaysU.S. Customs and Border Protection has reopened after temporarily suspending its operations at Montreal-Trudeau International Airport this morning. Several flights to the United States were cancelled. The suspension occurred due to an “odour of varnish associated with painting work,” which airport officials say did not pose any health risk. We thank passengers for… https://t.co/uwAEnBV4d1 — YUL Aéroport international Montréal-Trudeau (@yulaeroport) July 29, 2026 U.S. Customs reopens at Montreal airport, flights to the United States resume with delaysThis article was originally published at 9:45 a.m. and updated at 12:30 p.m.For our latest in news, please visit the News section.