The airports with the worst delay records

The airports that rack up the most delays year to year are Newark Liberty International (EWR), LaGuardia (LGA), John F. Kennedy International (JFK), Chicago O'Hare (ORD), and San Francisco International (SFO). These five consistently appear at the top of the Federal Aviation Administration's delay statistics, though the exact ranking shifts depending on the season and which metric you measure — total delays, percentage of flights delayed, or average delay length.

Newark and LaGuardia are particularly prone to delays because both airports operate near capacity during peak hours, with limited room to absorb disruptions. O'Hare in Chicago faces similar congestion, while JFK and SFO struggle with weather patterns that ground or slow flights for hours at a time. The Northeast corridor airports (Newark, LaGuardia, and JFK) together account for a significant share of U.S. flight delays, partly because they feed into one of the busiest airspace regions in the country.

Delay patterns also depend on the time of year. Summer months see more delays at all major airports due to thunderstorms and higher passenger volume. Winter brings weather-related delays to northern hubs like Chicago and Boston. If you are flying from or connecting through one of these airports, understanding their typical delay patterns can help you plan buffer time into your itinerary.

Key Takeaways

  • Newark, LaGuardia, and JFK consistently rank among the worst for delays because they operate at or near capacity and sit in a congested airspace region.
  • Chicago O'Hare and San Francisco International also appear regularly on high-delay lists due to congestion and weather patterns.
  • Summer delays are driven by thunderstorms and peak travel; winter delays concentrate at northern airports affected by snow and ice.
  • The FAA publishes monthly delay statistics by airport, so you can check current performance before booking a flight through a major hub.

Why these airports delay more than others

Capacity is the primary reason Newark and LaGuardia top the delay lists. Both airports were built decades ago and cannot easily add runways or gates. When one flight is delayed, it creates a domino effect because the next flight cannot use that gate or runway. LaGuardia, in particular, operates with only three runways serving over 30 million passengers a year, making it structurally prone to cascading delays.

Airspace congestion around New York compounds the problem. The three major New York airports (Newark, LaGuardia, and JFK) share the same airspace, and controllers must coordinate departures and arrivals across all three. A weather event or equipment issue at any one airport ripples through the others. Chicago O'Hare faces a similar dynamic as a major hub where many flights connect, so a single delay can affect dozens of onward flights.

Weather plays a different role at each airport. San Francisco International sits in a region prone to fog that reduces visibility and forces slower approaches. Northeastern airports face thunderstorms in summer and nor'easters in winter. Chicago experiences both summer storms and winter weather. Airports in milder climates like Atlanta (ATL) or Dallas-Fort Worth (DFW) have lower delay rates partly because they avoid these seasonal weather patterns.

How the FAA measures and reports airport delays

The FAA tracks delays in two main ways: on-time performance (the percentage of flights that depart or arrive within 15 minutes of schedule) and average delay length (how many minutes late flights actually run). A flight that departs 16 minutes late counts as delayed, even if it makes up time in the air. The FAA publishes these numbers monthly by airport and airline.

You can find official delay data on the FAA's website under "Airline On-Time Performance" reports. These reports break down delays by airport, airline, and month, so you can see whether a particular airport was worse in July than in June, or whether one airline has a better track record there than another. The data lags by about a month — the June report comes out in early August.

Keep in mind that published statistics measure scheduled delays, not cancellations. An airport might have a decent on-time percentage but a high cancellation rate, which means flights are being scrapped rather than delayed. If you are checking an airport's reliability before booking, look at both metrics.

Seasonal patterns and when delays peak

Summer (June through August) is the worst season for delays nationwide, but especially at major hubs. Thunderstorms in the afternoon and evening ground flights or force them to hold on the tarmac. Passenger volume is also highest in summer, so airports are operating closer to their limits. If you have flexibility, flying early morning or late evening in summer can reduce your exposure to afternoon thunderstorms.

Winter brings a different problem. Northeastern airports like Newark, LaGuardia, and Boston see snow and ice that require runway closures or de-icing procedures. Chicago and Denver also face winter weather delays. The worst winter delays typically occur in January and February. Southern and western airports like Atlanta, Dallas, and Los Angeles see minimal winter weather impact.

Spring and fall are generally the most reliable seasons for on-time performance. April, May, September, and October have fewer weather disruptions and lower passenger loads than summer. If you are booking a connecting flight through a major hub and have a choice of seasons, these months offer the best odds of staying on schedule.

What to do if you are flying through a high-delay airport

Build extra time into your itinerary when connecting through Newark, LaGuardia, Chicago, or San Francisco. If you have a tight connection — say, 45 minutes between flights — you risk missing your onward flight if the first one is delayed. Most travel advisors recommend at least 90 minutes for a domestic connection at a major hub, and two hours if you are changing airlines or need to collect baggage.

Check the FAA's delay statistics before you book. If you are flying in July and have a choice between connecting through Chicago or Atlanta, Atlanta's lower historical delay rate might make the longer routing worth it. Similarly, if you must fly through a high-delay airport, booking an early morning departure can help — delays tend to compound as the day goes on and earlier flights have fewer upstream problems to inherit.

On the day of travel, monitor your flight status starting a few hours before departure. The FAA's website and most airline apps show ground stops and delays in real time. If your airport is experiencing a ground stop (a temporary halt on departures), you will see it there before the airline notifies you. Knowing early gives you time to rebook or adjust your plans.

Comparing delay rates across different airports

The gap between the worst and best airports is significant. In recent years, Newark has reported on-time performance in the 70 to 75 percent range, meaning roughly one in four flights departs late. By contrast, airports like Hartsfield-Jackson Atlanta (ATL), Dallas-Fort Worth (DFW), and Denver (DEN) often report on-time rates above 80 percent. That 5 to 10 percentage point difference translates to dozens of fewer delays per day.

Smaller airports and those serving primarily point-to-point routes (rather than hub-and-spoke networks) tend to have better on-time records. Las Vegas, Phoenix, and San Diego rarely appear on high-delay lists. However, if your destination requires a connection through a major hub, you cannot always avoid the delay risk — the routing is determined by where airlines operate their networks.

Some airlines also perform better at specific airports. If an airline operates a major hub at an airport, it often has better on-time performance there because it controls more of the operation. Conversely, an airline that only has a few flights at a congested airport may experience worse delays because it has less influence over gate assignments and ground handling.

Frequently Asked Questions

Is LaGuardia really the worst airport for delays?

LaGuardia consistently ranks in the top five for delays, but the exact ranking changes month to month. Newark often edges it out, and in some months Chicago or San Francisco takes the top spot. LaGuardia's three-runway design and high passenger volume make it structurally prone to delays, but weather and airline scheduling also play a role in any given month.

Can I avoid delays by flying at a different time of day?

Yes, to some extent. Early morning flights (before 7 a.m.) have fewer delays because they do not inherit problems from earlier flights. Evening flights (after 7 p.m.) can also be more reliable at some airports. Midday and early afternoon flights face the highest delay risk, especially in summer when afternoon thunderstorms are most likely.

Does the airline matter, or is it just the airport?

Both matter. Some airlines have better on-time records than others, and an airline's performance varies by airport. An airline with a major hub at an airport usually performs better there. Check both the airport's delay statistics and the specific airline's on-time record before booking.

What is the difference between a delay and a cancellation?

A delay means the flight departs or arrives more than 15 minutes late but still operates. A cancellation means the flight does not operate at all. An airport can have a decent on-time percentage but a high cancellation rate. Always check both metrics when evaluating an airport's reliability.

Where can I find real-time delay information for my flight?

The FAA's website shows ground stops and system-wide delays in real time. Your airline's app or website shows your specific flight's status. FlightAware and similar tracking sites also display delays and allow you to see what is happening at your departure and arrival airports before you head to the airport.