The affected flight was WestJet 722, which took off from Vancouver at 5:14 p.m. PT, confirmed WestJet spokesman Robert Palmer.
"Yes, we've been hit again," he said.
The airplane landed safely in Calgary just before 8 p.m. MT.
A threat was made on Tuesday night against Flight 323 from Toronto to Saskatoon. It landed safely at John Diefenbaker airport and all 113 passengers and five crew members were able to leave the aircraft safely using the stairs.
That wasn't the case Monday night, when six passengers were injured during an emergency evacuation of a WestJet flight in Winnipeg. The Boeing 737-700 was about an hour and a half into its flight from Edmonton to Toronto when it made its emergency landing after an unspecified threat.
On June 27, a flight from Halifax to Edmonton was diverted to Saskatoon after an airport official in Kincardine, Ont., received a bomb threat. No explosives were found that time either, but the incident created flight delays in Saskatoon.