Top 20 Busiest International Routes of WestJet in 2025

CALGARY- WestJet (WS), Canada’s second-largest airline, maintains a strong international presence with a strong emphasis on transborder travel to the United States and key leisure destinations in Mexico and the Caribbean.

In 2025, its busiest international route by a wide margin is the one between Los Angeles (LAX) and Calgary (YYC). This high-demand route sees an average of 202 monthly flights, offering more than 30,500 seats and generating nearly 37 million Available Seat Miles (ASMs).

Moreover, the LAX–Calgary route exemplifies WestJet’s strategy of connecting key Canadian hubs to major U.S. cities and sunshine destinations with high-frequency service and competitive capacity.

While Calgary remains the dominant Canadian hub in terms of international connectivity, the scale and frequency of flights between Southern California and Alberta underscore the strength of WestJet’s transborder operations.

Los Angeles serves as a major U.S. gateway, not only for leisure travel but also for business and cultural exchanges between Western Canada and the southwestern United States.

Looking beyond Los Angeles, WestJet’s presence across the U.S. West Coast, southern hubs, and Caribbean holiday spots reveals a layered international network shaped by leisure demand, ethnic traffic flows, and key airline partnerships. In this article, we cover the airline’s top 20 busiest international routes, based on flights, seats, and ASMs.

WestJet Busiest Routes. Photo- FlyingJay Photography; Wikimedia Commons

Calgary’s Dominance in Transborder Travel

Calgary International Airport (YYC) plays a pivotal role in WestJet’s international operations. Of the 20 busiest international routes in 2025, nearly half originate or terminate in Calgary, reflecting the airport’s central role in the airline’s route map.

Following the LAX–Calgary route, WestJet also operates frequent services to Calgary from Phoenix (PHX), Las Vegas (LAS), San Francisco (SFO), Atlanta (ATL), and Houston Intercontinental (IAH).

The Phoenix–Calgary route sees an average of 178 monthly flights, making it the second-busiest international service for WestJet in terms of frequency. With over 26,800 seats and nearly 33 million ASMs, it’s a clear favorite for Canadian travelers escaping winter or seeking year-round sun.

Not far behind is Las Vegas–Calgary with 166 monthly flights, demonstrating the enduring popularity of this short-haul leisure corridor. Together, these routes highlight how critical warm-weather U.S. destinations are to WestJet’s transborder strategy.

Atlanta and Houston mark two standout entries in terms of long-distance productivity. The Atlanta–Calgary route, though only fifth in terms of flight frequency, generates more than 40 million ASMs, making it one of the most lucrative and capacity-efficient links in the network.

Similarly, Houston–Calgary sees a respectable 118 monthly flights but contributes over 31 million ASMs. These southern U.S. hubs likely benefit from a combination of business travel and one-stop feed through WestJet’s partner airlines.

Photo: By BriYYZ from Toronto, Canada – Westjet Boeing 737-700 (W), CC BY-SA 2.0, https://commons.wikimedia.org/w/index.php?curid=25906507

Vancouver and Toronto Extend the Reach

While Calgary claims the lion’s share of the top international routes, Vancouver (YVR) and Toronto (YYZ) also play prominent roles in WestJet’s global connectivity. Vancouver appears on the list with several high-frequency U.S. routes, including Las Vegas, Los Angeles, and Atlanta.

The Las Vegas–Vancouver service is especially notable, offering 118 monthly flights and more than 20 million ASMs, fueled by high leisure demand and weekend traveler volumes.

Atlanta–Vancouver, in contrast, provides a strong example of long-haul transborder efficiency. Despite a slightly lower frequency of 104 flights per month, the route generates the highest ASMs of any in the top 20, which is over 40 million.

This performance demonstrates that WestJet is capable of competing not only on short leisure runs but also on longer and strategically valuable trunk routes.

In eastern Canada, Toronto stands out as a major launching point for Caribbean and transatlantic operations. The Orlando–Toronto route, with 88 monthly flights and more than 15.5 million ASMs, continues to be a staple for family and leisure travel. Other Florida and Caribbean cities, such as Cancun, Montego Bay, and Punta Cana, also make the list.

Photo: By BriYYZ from Toronto, Canada – WestJet Boeing 737-800 C-GAWS, CC BY-SA 2.0, https://commons.wikimedia.org/w/index.php?curid=41141832

Caribbean and Mexico Leisure Links

WestJet’s winter sun strategy hinges heavily on destinations like Cancun, Punta Cana, Montego Bay, and Belize. Cancun–Toronto and Cancun–Calgary both feature in the top 20, offering consistent frequencies and substantial seat counts. The Cancun–Calgary route is especially ASM-rich, with over 30 million ASMs despite just 70 monthly flights.

Punta Cana–Toronto and Montego Bay–Toronto both clock in at over 10,000 monthly seats, showcasing the strength of WestJet’s Caribbean play from eastern Canada. In these markets, WestJet competes with Air Canada and a growing number of ultra-low-cost carriers, relying on its strong brand loyalty and bundled vacation offerings to maintain market share.

WestJet’s international reach is not limited to the Americas. Dublin–Toronto and Edinburgh–Toronto both appear in the top 20, reflecting WestJet’s growing ambitions across the Atlantic. These two European routes combine to offer over 22,000 monthly seats and more than 74 million ASMs, making them among the highest-capacity services in the airline’s international network.

The seasonal and VFR (Visiting Friends and Relatives) traffic, combined with codeshare feed from Canadian and European partners, helps keep these routes viable and competitive.

Photo: Mackenzie Cole | Flickr

Western U.S. Saturation and Emerging Niches

The West Coast of the United States remains a heavily contested market, but WestJet has carved out a loyal following on routes like Seattle–Calgary, San Francisco–Calgary, and San Diego–Calgary. These city pairs combine business, tourism, and connecting traffic to deliver consistent volumes across the calendar year.

Smaller but strategic routes such as Las Vegas–Edmonton and San Diego–Calgary round out the top 20 busiest international routes.

Although these routes may not match the transatlantic or Caribbean markets in terms of ASMs, they remain vital for year-round balance and regional market coverage.

Photo: Boeing

WestJet 10 Busiest International Routes

Bottom Line

One noteworthy observation is the heavy presence of U.S. destinations in WestJet’s busiest international routes.

Of the 20 listed, 15 connect to cities in the United States. This underlines how deeply integrated WestJet’s network is with its southern neighbor, making the U.S. both a key market and a strategic necessity for future expansion.

Moreover, the mix of Florida, California, and Gulf Coast cities reflects a fine-tuned understanding of where Canadian travelers want to go, especially in the colder months.

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