WestJet flight attendants represented by CUPE 8125 went on strike on or around August 2, 2026, after final negotiations between the airline and the union broke down. The strike followed a 72-hour strike notice issued by the union on July 30 and a matching 72-hour lockout notice from WestJet the same day. By the time the walkout began, WestJet had already cancelled 309 flights through August 2, having begun an organized shutdown of its network the day prior Reuters.

The path to the strike was set in motion weeks earlier. WestJet Mainline flight attendants, represented by CUPE 8125, opened a strike vote on July 9, 2026, with voting set to continue until July 15. Members voted 99 per cent in favour of strike action, with one source reporting 99.4 per cent support, and nearly 4,400 flight attendants eligible to walk off the job CUPE. Following a 21-day cooling-off period (a mandatory waiting period that gives both sides time to reach a deal before any work stoppage), the earliest legal strike date fell on August 2.

On July 30, CUPE 8125 issued its 72-hour strike notice. WestJet responded within hours by issuing its own 72-hour lockout notice — a lockout being when the employer temporarily shuts workers out rather than waiting for them to walk out — which the airline described as a measure to maintain operational control WestJet. At that point, WestJet publicly stated it had not cancelled flights or begun winding down operations and cited progress in the negotiations Reuters.

That assessment shifted within 24 hours. WestJet began parking planes ahead of the possible walkout CBC. On August 1, the airline initiated an organized takedown of its network, starting with 86 flight cancellations that Saturday and expanding to 309 cancellations through Sunday as the strike deadline approached Reuters. The cancellations covered travel between July 30 and August 4 WestJet.

Despite the escalating shutdown, WestJet maintained on August 1 that it remained committed to reaching a negotiated agreement and believed a deal was within reach WestJet. The airline published a dedicated facts-and-FAQs page on the CUPE labour negotiations outlining its position WestJet. Talks nonetheless failed to produce an agreement before the deadline.

The strike lands during the peak of Canada's summer travel season, compounding the disruption for passengers. A CBC report highlighted cases where affected travellers could face costs upward of $20,000 for rebooking on alternate carriers CBC. A survey released July 29 found Canadians overwhelmingly supported WestJet flight attendants and their right to strike CUPE.

The broader context here is a Canadian labour relations framework that imposes structured timelines on collective bargaining disputes. The 21-day cooling-off period after a strike mandate, the 72-hour notice requirement before any work stoppage, and the employer's corresponding lockout notice all serve as procedural guardrails designed to force final-stage negotiations. The fact that both sides triggered their respective notices simultaneously on July 30 effectively guaranteed a collision course toward August 2 unless a deal materialized in the interim. WestJet's decision to begin an early, proactive network wind-down — rather than wait for the legal strike deadline — reflects an operational calculus that an orderly, managed cancellation sequence is less costly and logistically cleaner than an abrupt halt with aircraft and crews stranded mid-route.

What remains unresolved is the duration of the stoppage and its downstream effects on WestJet's network recovery. The airline has not disclosed how quickly it could restore full operations once a settlement is reached. For a carrier managing a scheduled takedown across multiple days, the repositioning of aircraft and reactivation of crew rosters will impose their own timeline. Passengers holding bookings beyond the current cancellation window of August 4 face uncertainty about whether further cancellations will follow. The 99 per cent strike mandate gives CUPE 8125 considerable leverage at the bargaining table, but it also signals that the membership's expectations for a resolved deal are high, narrowing the space for a compromise that both sides can sell to their constituencies.