DOJ Clears Allegiant’s $1.5 Billion Sun Country Deal, Paving Way for Budget-Airline Shakeup

Sun Country Airlines employees saw the news before Wall Street did.

“The federal antitrust review process for our airline transaction has been completed by the Department of Justice,” Allegiant Travel Co. Chief Executive Greg Anderson wrote in a March 16 email circulated to Sun Country staff and later filed with regulators. With that line, a $1.5 billion bet on the future of U.S. low-cost flying quietly crossed its biggest regulatory hurdle.

Allegiant’s proposed acquisition of Minneapolis-based Sun Country Airlines has won early termination of the mandatory waiting period under the Hart-Scott-Rodino Antitrust Improvements Act, the companies said March 16. The move amounts to antitrust clearance from the Justice Department and positions the deal to close as soon as the second or third quarter of 2026, assuming shareholders and transportation officials sign off.

The transaction would combine two leisure-focused, lower-cost carriers into a single airline carrying about 22 million passengers a year across nearly 175 cities and more than 650 routes, with roughly 195 aircraft. It is also one of the first significant airline mergers to gain a green light under the second Trump administration, after years in which federal enforcers moved aggressively to block consolidation they said would raise fares.

A different kind of airline merger

Under the agreement announced Jan. 11, Las Vegas-based Allegiant will acquire Sun Country in a cash-and-stock deal valued at about $1.5 billion, including roughly $400 million of Sun Country net debt. Sun Country shareholders will receive $4.10 in cash and 0.1557 Allegiant shares for each Sun Country share, implying a value of $18.89 per share at signing—about a 20% premium to Sun Country’s closing price on Jan. 9.

When the deal closes, Allegiant investors are expected to own about 67% of the combined company, with Sun Country shareholders holding the remaining 33%.

Allegiant and Sun Country present the combination as a way to build a scaled but still niche competitor to the major U.S. airlines, particularly in leisure and secondary markets that big carriers often serve sparingly or at higher fares.

Together, the companies say, they will serve more than 650 routes touching almost 175 destinations, much of it point-to-point flying that connects small and mid-sized cities with vacation spots in Florida, Nevada, and the Sun Belt. Minneapolis–St. Paul will remain a significant presence and the largest base of operations for the combined airline, while corporate headquarters stay in Las Vegas.

“This merger brings together two highly complementary networks to create a leading, more competitive leisure-focused U.S. airline,” Anderson said in the January deal announcement. Sun Country Chief Executive Jude Bricker, a former Allegiant chief operating officer, called the transaction “a natural fit” and said it would allow the airlines “to offer more destinations and better value to our customers.”

Why DOJ said yes after JetBlue–Spirit

The Justice Department’s quick clearance stands in contrast to its handling of other recent airline tie-ups.

In 2024, a federal judge sided with antitrust enforcers in blocking JetBlue Airways’ proposed acquisition of Spirit Airlines, finding that eliminating Spirit—a large ultra-low-cost carrier—would likely lead to higher prices and fewer options for cost-conscious travelers. DOJ also successfully challenged a partnership between JetBlue and American Airlines in the Northeast, which a court ordered unwound.

By comparison, DOJ allowed the waiting period to expire in last year’s Alaska Airlines–Hawaiian Airlines deal and did not sue to stop Allegiant–Sun Country during the Hart-Scott-Rodino review. While the agency can, in theory, revisit a transaction even after early termination, it rarely does once it has blessed a deal at that stage.

Regulators and analysts point to key differences. JetBlue and Spirit competed head-to-head on many routes and were both positioned as disruptive low-fare alternatives to larger rivals. Allegiant and Sun Country overlap less and have distinctive business models.

Allegiant focuses on flying infrequently served nonstop routes from smaller markets—such as Appleton, Wisconsin, or Allentown, Pennsylvania—to leisure destinations like Las Vegas and Orlando, relying heavily on ancillary fees to keep base fares low. Sun Country uses Minneapolis–St. Paul as its main hub, mixes scheduled leisure service with a sizable charter business, and operates dedicated Boeing 737 freighters under a long-term cargo agreement with Amazon.

In their merger announcement, the airlines emphasized that their networks are “largely complementary” and argued that the combined carrier would enhance competition with larger airlines “by expanding options and lowering prices for leisure travelers.”

What still needs approval

Despite the DOJ clearance, Allegiant and Sun Country cannot yet consummate the deal.

The companies have said they expect to close in the second or third quarter of 2026, subject to shareholder approvals at both firms, the completion of other customary closing conditions, and action by the Department of Transportation.

Like Alaska and Hawaiian, the merged Allegiant–Sun Country is seeking an interim exemption from DOT that would allow ownership to change hands while the carriers continue to operate under separate certificates until a full integration is approved. In the Alaska–Hawaiian case, DOT attached consumer-focused conditions involving frequent-flier benefits and interisland capacity.

Allegiant and Sun Country have not detailed what, if any, conditions DOT might impose on their transaction. In securities filings, they listed regulatory risk and potential delays among the factors that could still derail or alter the deal.

Promises to workers and passengers

Internally, executives have stressed continuity in the short term.

“There will be no changes to pay or benefits for Sun Country team members as a result of closing,” Anderson wrote in his March 16 note to employees. He said existing collective bargaining agreements would remain in place and that any integration of work groups would follow processes laid out under the Railway Labor Act.

The airlines have also told customers that, at least initially, they will continue to operate under their own brands, with separate websites and reservations systems, until they obtain a single Federal Aviation Administration operating certificate. A combined loyalty program—spanning about 23 million members from both airlines—is planned but not expected to take effect immediately at closing.

Still, front-line workers have voiced concern on internal forums and industry message boards about how seniority lists will be merged, whether crew bases will be consolidated, and how Allegiant’s bare-bones cost structure might influence Sun Country’s operation.

The companies have framed the deal as an opportunity for employees. Allegiant has said it projects about $140 million in annual cost and revenue synergies by the third year after closing, driven by higher aircraft utilization, procurement savings, and network optimization. Management says that growth should translate into more flying and career opportunities, particularly as Sun Country’s charters and cargo flying help smooth the seasonality that often affects leisure carriers.

Impact on fares and small-city service

For travelers, the question is whether a bigger Allegiant–Sun Country will translate into cheaper, more plentiful flights—or fewer choices over time.

In public statements, both airlines have argued that the merger will mean “more seats and lower fares,” especially at Minneapolis–St. Paul International Airport and in smaller markets where they operate. Industry research on past mergers, however, suggests the effects are mixed: consolidation can increase efficiency and open new routes, but it can also reduce capacity and raise prices on overlapping city pairs where competition declines.

Because Allegiant and Sun Country compete directly on relatively few routes today, analysts say the immediate impact on fares may be limited. The risk is more acute in small and mid-sized cities that depend on one or two low-cost options to reach vacation destinations. If the combined airline later trims underperforming flights or harmonizes pricing upward, those communities could see fewer bargains.

Airport officials in some of those markets have said publicly they expect “business as usual” until at least late 2026, when integration would likely begin in earnest. The companies have not announced any route cuts tied to the merger.

A test case for what comes next

The Allegiant–Sun Country deal will now move from antitrust review into implementation—and into the broader political debate over airline consolidation.

Business groups have long argued that U.S. carriers need scale to compete and invest, particularly after the pandemic. Consumer advocates counter that a decade of mergers among major airlines has left most domestic capacity in the hands of four giants and eroded price discipline.

By granting early HSR termination to Allegiant and Sun Country while previously blocking JetBlue–Spirit, the Justice Department has drawn a rough distinction between mergers that remove a direct low-fare rival from key routes and those that knit together smaller, more specialized networks.

What that line means in practice—for fares from Minneapolis, for flights out of smaller cities, for airline workers’ jobs and bargaining power—will depend on decisions yet to come from DOT, from shareholders, and from managers integrating two very different carriers into a single leisure-focused airline.