New Delhi, Aug. 3 -- Canada's WestJet cancelled hundreds of flights after flight attendants went on strike on Sunday, following talks with the country's second-largest carrier that fell through.

According to the airline, approximately 250,000 travellers have had their flights cancelled on a three-day holiday weekend in Canada. More passengers will be affected depending on how long the work stoppage lasts, Reuters reported.

The carrier, which has a domestic market share of 30 percent and flies to destinations in the US, the Caribbean, Central America and Europe, had cancelled 615 flights as of mid-morning Sunday, aviation analytics company Cirium was quoted by Reuters as saying.

WestJet is majority-owned by Onex Corp. The Canadian Union...