Frontier Adds 11 Routes at DTW to Replace Spirit Airlines

Detroit Metropolitan Wayne County Airport spent much of this year absorbing a hard hit. Spirit Airlines, DTW's second-largest carrier with more than 1.7 million passengers in 2025, ceased operations on May 2 after a last-ditch bankruptcy exit plan collapsed, leaving nine gates empty at the airport almost overnight. The Wayne County Airport Authority responded by raising landing fees 10% and terminal rental rates as much as 13% starting July 1 to cover the lost revenue, a cost that airlines serving DTW, and eventually their passengers, are still absorbing. Five months later, the carrier stepping into that gap has become clear, and it matters for anyone booking a Detroit-area trip this fall or winter. Frontier Airlines moved fast. By early July it had launched three new daily routes from DTW, to Fort Lauderdale, Philadelphia and Las Vegas, with introductory one-way fares of $49, $79 and $79. That was just the opening move. In mid-September, Frontier announced a much larger second wave: a new nonstop to New York-LaGuardia starting November 20, running daily through the December 2 to March 6 holiday travel period before dropping to three times weekly, with introductory fares from $69, plus new nonstop service to Houston, Cancun, Charlotte and New Orleans rolling out between late November and mid-February. Frontier is also adding frequencies on existing Detroit routes to Miami, Orlando and Tampa. Put together, Frontier says it will serve 15 nonstop destinations from DTW by spring, 11 of which were previously flown by Spirit, and that its total seats for sale from Detroit will run 41% higher in March 2027 than in March 2026. Delta, which runs DTW as one of its largest global hubs, has not walked away from the vacated capacity either, but it is Frontier that has been the most visible, aggressive replacement for Spirit's old low-fare network specifically. If a nonstop you used to book on Spirit disappeared this year, there is a real chance Frontier now flies it, or will within the next few months. That is genuinely good news if your route is on the list, but it comes with real caveats worth knowing before you book. First, those headline fares are introductory teasers on brand-new routes; like most ultra-low-cost pricing, they tend to climb quickly once a route is established and seats start selling, so if $49 to Fort Lauderdale or $69 to LaGuardia looks appealing, book sooner rather than later rather than waiting for the deal to still be there next month. Second, remember what an ultra-low-cost fare does not include: checked and carry-on bags, seat selection and even basic snacks typically cost extra on Frontier, so compare the full cost against Delta's fare, not just the base price, before assuming Frontier is automatically cheaper for your trip. Third, and this is the one that catches travelers off guard, Frontier has no interline agreements with Delta or other legacy carriers at DTW. If your Frontier flight is canceled or significantly delayed, the airline cannot simply rebook you on the next Delta departure the way partner airlines sometimes can; you are typically limited to Frontier's own next available flight, which on a route running just three times a week could mean a multi-day wait. Build real schedule buffer around any trip on one of these thinner-frequency routes, especially outside the daily holiday-season windows. So what should Midwest travelers actually do? If you're booking Detroit travel for the holidays or early next year, check whether Frontier now serves your destination nonstop before defaulting to a Delta connection, since several of these routes, especially LaGuardia, Fort Lauderdale and Las Vegas, are already flying or launching soon. Book the introductory fare promptly if the price and schedule work, since ULCC pricing rarely stays at launch levels for long. And if your travel dates are fixed and inflexible, lean toward Delta or a route running Frontier's daily holiday-season schedule rather than a new three-times-weekly Frontier route, since a single misconnection on a thin schedule can cost you several days rather than a few hours. Sources At Detroit Metro Airport, Frontier moves to fill the void left by Spirit's collapse - Crain's Detroit Business - https://www.crainsdetroit.com/transportation/cdb-frontier-airlines-expands-dtw-flights-20260917/ Frontier Continues Rapid Growth in Detroit With New Nonstop Route to New York's LaGuardia Airport - Frontier Airlines Newsroom - https://news.flyfrontier.com/frontier-continues-rapid-growth-in-detroit-with-new-nonstop-route-to-new-yorks-laguardia-airport/ Frontier launches 3 new daily routes from DTW to replace Spirit service - WXYZ Detroit - https://www.wxyz.com/news/frontier-launches-3-new-daily-routes-from-dtw-to-replace-spirit-service Detroit Metro Airport raises fees after Spirit Airlines bankruptcy and closure - WILX - https://www.wilx.com/2026/07/01/detroit-metro-airport-raises-fees-after-spirit-airlines-bankruptcy-closure/ Detroit Metro Airport feels aftershocks of Spirit bankruptcy - Crain's Detroit Business - https://www.crainsdetroit.com/transportation/cdb-spirit-airlines-failure-dtw-20260716/