Flight Delays Near 1,900 as Low Clouds Snarl Denver, Seattle Hubs

A mild-weather day that still went wrong

Tuesday, October 27, brought no blizzard, hurricane or system outage. Even so, it ended as one of the rougher days for U.S. air travel this autumn. FlightAware counted 1,886 delays on flights within, into or out of the United States as of 6:45 p.m. EDT, along with 52 cancellations tied to U.S. operations.4 Worldwide, the tracker showed more than 12,000 delays and 730 cancellations.4

The main cause was low cloud cover. The Federal Aviation Administration warned that low ceilings could slow traffic at Denver International, San Diego International and Seattle-Tacoma International.4 The agency did not say that weather caused every delay FlightAware recorded.4

The numbers grew steadily through the day. At 9:55 a.m. ET, the count was 462 U.S. delays and 32 cancellations.7 By 11 a.m. EDT it had reached 784 delays, with cancellations still at 32 and no nationwide ground stop in place.98 By evening, delays were more than double the late-morning figure.4 Monday had followed the same pattern. FlightAware logged at least 868 U.S. delays and 39 cancellations by mid-morning. The FAA flagged low clouds at Chicago Midway and O'Hare, Denver, Detroit, San Francisco and Seattle, and wind at several Florida airports.5

Why low clouds cause long delays

Headlines about "travel chaos" can make it sound as if the system broke down. The data suggest otherwise. Cancellations stayed in the dozens while delays reached the thousands. Airlines kept flying, just late.

The reason is how low clouds work. A low ceiling cuts the number of aircraft that can land safely at an airport in a given period.4 Each aircraft and crew usually flies several legs a day, so a morning slowdown at a hub like Denver can push back every later flight on that plane's schedule.10 That helps explain why the counts kept climbing into the evening even though the weather itself was not dramatic.410

All the outlets that covered the day agree on the numbers and the main cause. They differ mostly in tone. Some local broadcast write-ups stuck to the figures and the FAA's guidance.12 Others called the situation "chaos" while also noting that most flights still operated.10 The more accurate description is a widespread slowdown, not a collapse. Still, for the people stuck in it, the difference matters less than a missed connection.

Weather delays and passenger rights

The more important part of this story is what passengers are owed when delays like these happen, because those rules are changing.

One rule has not changed. Under Department of Transportation regulations, travelers are entitled to a refund if an airline cancels or significantly changes their flight and they decide not to travel.10 That right comes from the DOT's refund rule, known as Part 260. It requires a full refund, including taxes and extra fees, whenever a passenger turns down the alternative the airline offers.24

Meals and hotel rooms are a different matter. Those are voluntary airline commitments. They usually apply only when the delay is within the carrier's control.27 Weather delays like Tuesday's generally fall outside that category, so travelers stranded by low clouds should not expect a voucher.

The set of delays that count as the airline's fault is also about to get smaller. In September, the DOT finalized a rule that takes 10 types of disruption out of the airline-controlled category.23 They include:

• unscheduled maintenance that cannot be deferred
• aircraft damage from extreme weather
• removal of an unruly passenger
• cybersecurity attacks
• certain government system failures
• airport closures due to volcanic ash or wind shear

25 The rule was supposed to take effect October 19. After the trade group Airlines for America asked for more time to set up reporting systems, it was pushed back to February 1, 2027.22

The DOT's own analysis says the total value of meals, hotels and other compensation airlines give passengers will fall under the rule, though it cannot say by how much.2429 The department has called the change "a transfer of value from consumers back to air carriers."29 A DOT spokesperson pointed out that Congress required these changes in the FAA Reauthorization Act of 2024, which President Joe Biden signed.25

The spokesperson's point is accurate, but it leaves out the wider picture. In November 2025, the DOT withdrew a Biden-era proposal that would have required airlines to pay cash for delays they caused. CBS News reported that proposal would have meant $200 to $300 for domestic delays of three hours or more.29 Taken together, the cash proposal is gone and the list of airline-caused delays is shrinking. Both changes move in the same direction: passengers will have fewer protections.2129

The practical upshot is that travelers will need to protect themselves more often. Experts quoted on the rule change advise getting the reason for a cancellation in writing and checking whether travel insurance or a credit card covers delays.22 Travel insurers are already marketing to fill that gap.27 Some premium credit cards reimburse meals and lodging when a delay runs longer than six hours.24

Strikes: mostly a European problem this month

Despite the dramatic headlines, no major U.S. carrier was on strike during the October 27 disruption. Most of this month's labor trouble in aviation has been in Europe. Five French pilot and cabin crew unions called a national walkout for October 17 to 21 over a pension reform. They suspended it on October 9 while waiting for a government decree.4248 Separately, easyJet crews scheduled a 24-hour strike in Italy for October 16.50

In the U.S., the closest example was Horizon Air. Its flight attendants, represented by the Association of Flight Attendants, held a system-wide day of action and picketing on October 14 to push for a new contract. Management said talks with a mediator were productive and that tentative agreements had been reached on 12 contract articles.49 The labor risk for American flyers is real, but it has not yet affected operations.

Security lines: estimates vary widely

TSA wait times are hard to pin down. A data analysis summarized by Simple Flying found average waits of 23.1 minutes at New York's JFK and 20.2 minutes at Chicago O'Hare, the longest among the country's ten busiest airports. San Francisco averaged just 4.5 minutes.31 A wider study of 50 airports put the national average at 9.9 minutes, with San Antonio fastest at 3.7.3335

Other reports painted a much worse picture. One outlet described PreCheck waits of up to 95 minutes at Atlanta in mid-October. It blamed a backlog and a surge in REAL ID enrollments and predicted things would return to normal around October 20.32 Those figures are far higher than the long-run averages, so travelers should treat them carefully. Checking an airport's live wait-time page on the day of travel is more reliable. Atlanta, for example, posts waits for each checkpoint.34

On days with weather delays, security lines and delays can add up. A traveler who clears security quickly may still sit at the gate for hours. That is why advice for the coming holiday season keeps emphasizing earlier departures, longer layovers and checking flight status before leaving home.10

New entry rules for international travel

International travelers face several new requirements. Starting at 11:59 p.m. Eastern on November 3, every passenger on a flight to the United States must sign a CDC form stating they have not been in the Democratic Republic of the Congo in the previous 21 days. This applies to U.S. citizens and passengers connecting through U.S. airports.5558 Passing through a Congolese airport counts as being in the country.55 Airlines that let a passenger board without the form will be in breach of the order.54 The requirement is set to last until December 18, though the CDC can extend it.

Other rules add to that burden:

• Visa bonds: applicants for business and tourist visas from 50 countries may be required to post a bond of $10,000 to $20,000, based on a country list updated October 2.52
• ESTA fee: the travel authorization fee rose to $40.62 on October 16.51
• Social media review: the State Department expanded online-presence screening to more visa categories on October 1.51

None of these rules caused Tuesday's delays. But they add more steps at check-in and at the border, and they arrive just as airlines are working through weather disruptions and fewer passenger protections.

What it means

On its own, Tuesday was an ordinary weather day. Low clouds slowed a few hubs and the delays spread across the network.410 What makes it worth noting is the timing. Passengers' refund rights are intact.24 But the airline-funded meals and hotel rooms that make a long delay easier to get through are shrinking under federal policy.29 Meanwhile, international travelers face more paperwork than at any point this year.58 The likely result is more delays this winter for which passengers end up paying their own costs.