Frontier Airlines Expanded Network After Spirit Collapse

The airline launched new routes and increased capacity to capture leisure markets left behind by Spirit Airlines.

Updated on Sept. 25, 2026 in Air Travel

Screen-print poster illustration of a passenger airplane ascending against a mustard and teal sky, representing airline network expansion. — Frontier Airlines has aggressively increased its leisure route network following the collapse of Spirit Airlines, capturing significant industry market share in 2026. AI Illustration. Upload story photo >

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Frontier Airlines has aggressively expanded its network into secondary leisure markets following the closure of Spirit Airlines in May 2026. The carrier now accounts for approximately 40% of the industry capacity restored after the market shift.

Why it matters

Frontier is optimizing network economics by prioritizing leisure-oriented routes with less competition. This strategy avoids the high costs associated with rebuilding the former megahub operations at Fort Lauderdale-Hollywood International Airport.

Frontier Airlines reported a 23% increase in scheduled capacity for September 2026 compared to the previous year. The airline projects a 3% to 5% improvement in revenue per available seat mile as it shifts focus to secondary markets.

The players

Frontier Airlines

An American ultra-low-cost carrier that operates flights to over 100 destinations across the United States and internationally.

Spirit Airlines

A former American low-cost carrier that ceased all operations in May 2026.

The details

Frontier is focusing on individual city pairs rather than wholesale hub reconstruction, moving aircraft away from routes like those at Chicago O'Hare where they cut eight services. The airline launched eight routes previously held by Spirit in July 2026 and began a new service between Las Vegas and Boise on September 10.

May 2, 2026: Spirit Airlines ceased all operations.
July 2026: Frontier launched eight former Spirit Airlines routes.
September 10, 2026: Frontier launched Las Vegas to Boise service.
September 2026: Frontier cut eight routes from Chicago O'Hare.
January 2027: Frontier concludes its current new route expansion phase.

Roadmap

This move marks a shift away from the traditional megahub model, which has struggled with high operational costs in the current economic environment. Frontier is positioning itself to fill leisure travel demand gaps left by the 2026 collapse of Spirit Airlines.

Travelers may find new route options in secondary leisure markets as Frontier reallocates its aircraft. Conversely, passengers previously utilizing the eight discontinued routes at Chicago O'Hare will need to seek alternative carriers for those specific city pairs.

The takeaway

Frontier's pivot toward high-demand leisure routes demonstrates a tactical shift toward profitability over market share at major hubs. Passengers should monitor network changes closely as the airline completes its expansion phase by early 2027.

What happens next

Frontier Airlines is scheduled to launch a daily connection between Denver International Airport and Fort Lauderdale-Hollywood International Airport on November 20, 2026.