These Airlines Are Most Likely to Delay Your Flight, New Data Shows

Choosing an airline is about more than ticket prices and legroom. If you have a connecting flight, an important meeting, or a long-awaited holiday planned, arriving on time can make the difference between a smooth trip and an expensive headache.

Recent U.S. Department of Transportation (DOT) statistics and Cirium aviation analytics show why some airlines deserve more credit for punctuality than others.

The bummer? An airline’s performance changes by reporting period, season, airport congestion, and weather. That means a carrier that performs well across a year can still leave passengers stranded during a difficult summer travel period.

The On-Time Rankings

The clearest annual comparison comes from Cirium’s 2025 On-Time Performance Review, released January 2, 2026. Delta led North America, while Alaska placed second. Frontier finished last among the 10 North American airlines in Cirium’s ranking.

Source: Cirium‘s 2025 North American airline rankings.

These figures suggest Delta is the strongest bet among the major U.S. carriers listed, while Frontier passengers faced the greatest likelihood of a late arrival. Alaska also performed strongly, although neither airline was immune to disruption.

Passenger experiences, as reflected by the r/delta subreddit, are more mixed, as individual results vary heavily by route, airport, season, and luck:

“I originate out of TPA, my on-time rate out of Tampa is better than 90% (over 27 business trips this year). Delays have more to do with the individual airport than the airline in most cases.” 

   → Comment by u/Chronically_Chronic 

“Delta is the best US airline!!! Sh*t happens, you get delayed.” 

   → Comment by u/nashaway 

“I took over 100 delta flights this year and I doubt I had that much delay total.” 

   → Comment by u/mrvarmint 

“I’ve only flown 26 flights so far this year with a little less than 3 hours of delay total. 44 minutes was my longest at JFK, but I consider that on time for them.” 

   → Comment by u/Puzzleheaded_Age8937 

“I’ve had 23 flights in 2026 so far and according to flighty, only 13 min. of delay total. All on Delta.” 

   → Comment in this thread. 

Importantly, Cirium defines an on-time arrival as reaching the gate within 14 minutes and 59 seconds of the scheduled arrival time. Its review draws on more than 600 real-time data sources, including airlines, airports, distribution systems, and aviation authorities.

The Numbers Change With the Season

The DOT’s monthly Air Travel Consumer Report demonstrates why one ranking cannot tell the whole story. In October 2025, Delta recorded an 83.6% on-time arrival rate, while Alaska achieved 78.2%, Southwest 77.1%, JetBlue 73.5% and Frontier 77.3%.

By February 2026, the picture had shifted dramatically:

Source: U.S. DOT, February 2026 Air Travel Consumer Report.

JetBlue’s result is particularly striking: its February performance trailed Delta’s by 19.1 percentage points, but that’s a monthly comparison, not evidence that JetBlue is always that far behind.

Weather, airport congestion, staffing constraints, and knock-on delays can all affect punctuality. Winter storms and summer thunderstorms may disrupt schedules, while a delayed inbound aircraft can affect its next departure. That said, these are plausible operational explanations, not proof of what caused any individual airline’s monthly result.

So, Which Airline Is Most Likely to Get You There Late?

For travelers prioritizing punctuality, the data points to Delta and Alaska as strong, evidential choices, with United and Southwest also capable of competitive results. Frontier‘s last-place North American ranking in Cirium’s 2025 review makes it a weaker choice for passengers who cannot afford delays. JetBlue deserves particular scrutiny when checking recent monthly figures.

Still, the DOT and Cirium rankings should not be treated as interchangeable. The DOT’s monthly tables report operating-carrier performance, while Cirium publishes its own analysis and rankings. Their methodologies and reporting periods differ, so their percentages will not always match. The DOT’s historical tables also allow readers to compare monthly results and year-to-date performance.

But what are actual flyers, not stats or rankings, saying?

Interestingly, they point to a fairly clear pattern: Delta earns the most consistent trust from frequent flyers when it comes to on-time performance. Travelers on X and Reddit repeatedly say they stick with Delta specifically because it’s the most reliable of the major carriers, and regulars in Delta-focused communities tend to contrast it favorably against American and United, with many people who fly all three reporting better personal on-time results on Delta.

Alaska and Southwest also draw solid grassroots praise, though usually from flyers whose home airports align with those networks; Southwest fans tend to describe it as “reliable enough” and value it for nonstops and lower cancellation risk in their experience.

On the other end, American Airlines draws the heaviest and most consistent frustration right now. Recent Reddit threads are full of flyers saying they’re done with AA after repeated delays and cancellations, with commenters describing rolling delays, last-minute cancellations, and a pattern of problems over the past six to twelve months.

Typical complaints include “AA is legit the worst” and frustration that American delays flights in small increments that keep passengers waiting longer and longer. Frontier is the other airline most frequently singled out as one to avoid for punctuality, with multiple people saying they refuse to book it even when it’s cheaper specifically because of delays.

JetBlue also gets frequent “always late” bashing, especially on East Coast and transcon routes, though it isn’t roasted quite as universally as American or Frontier.

United lands in mixed territory—okay but not great—while the overall vibe breaks down roughly as Delta is the most reliable of the majors, Alaska is especially solid on the West Coast, Southwest is decent or better than expected for its size, United mixed, and American, Frontier, and JetBlue most often called out as delay-prone.

Passenger sentiment is apparently route- and airport-dependent, since airports like LGA, JFK, ORD, and DFW amplify problems for everyone, but the clearest pattern in recent discussions is that Delta gets the most “I trust them to get me there on time” comments, while American and Frontier get the most “I’m done with their delays”.

The practical takeaway: Check the airline’s latest figures and your specific airport before booking, especially if you’re travelling during a busy holiday period. Consider the departure time and whether you have a tight connection, too. A direct flight can reduce exposure to missed connections, while an earlier departure may leave more options if disruption strikes.

No airline can guarantee a punctual arrival. But if getting there on time matters more than saving a few dollars, the evidence suggests that comparing operational reliability alongside ticket prices is money well spent.