The airline says the scam advertises return flights for up to 50 per cent lower than fares available through the WestJet website.
WestJet says as many as 100 conference-goers accepted the offer and paid for the airfare only to discover their ticket was invalid because it was actually bought with a stolen credit card.
The airline says it has turned over information regarding the scheme to police.
The latest fraud aimed at WestJet follows a telephone scam that involved fraudsters selling questionable holiday packages and suggesting those being called had won 999 WestJet dollars.
Also on HuffPost: