The company released digitally-rendered images of its new livery on a Boeing 787-9 during a marketing event on 8 May in a hangar at Calgary International airport.
But the livery will first adorn new 737 Max 8s scheduled for delivery starting in June, says WestJet.
Aircraft painted in the new design will have a nearly all-white fuselage adorned with "WestJet" in capitalised all-blue letters.
That is a change from the current livery, which has "WestJet" painted in two colors – "West" in blue and "Jet in turquoise.
The single colour helps "soften the regional emphasis on 'west'", the company says.
In addition, the fuselage of newly-painted aircraft will read "The Spirit of Canada" on one side, and the French translation "L'esprit du Canada" on the other, WestJet says.
The aft portion of the fuselage and the tail will carry a turquoise, blue, white and grey design that includes curving lines, sharp angles and an image that resembles a maple leaf.
The engine nacelles will also be white with a streak of turquoise across the bottom, marketing materials show.
After first appearing on 737 Max 8s, the new livery will show up on WestJet's incoming 787-9s, which are scheduled to begin arriving in January 2019, the company says.
WestJet also plans to repaint existing aircraft in the new scheme as those aircraft enter scheduled maintenance overhauls, says vice-president of guest experience Louis Saint-Cyr.
The company has orders for 10 General Electric GEnx-powered 787-9s, and options for another 10 of the type.
WestJet will outfit the 787s with about 320 seats, including 16 pod-like lie-flat seats in business class and 24 premium economy seats, chief executive officer Ed Sims says.
(Jon Hemmerdinger - FlightGlobal News)