Severe Weather and Construction Lead to Flight Delays at Logan Airport

Boston, September 26, 2025

News Summary

Boston Logan Airport experienced significant disruptions on Thursday as thunderstorms combined with ongoing runway construction caused nearly a third of departing flights to be delayed. By mid-afternoon, 30% of flights were delayed, and about 10% canceled due to weather conditions and a temporary ground stop issued by the FAA. Passengers are urged to check flight statuses online due to the potential for continued delays and extended airport processing times.

Boston — Nearly a third of flights departing from Boston Logan Airport were delayed on Thursday as thunderstorms combined with ongoing runway construction to disrupt operations and prompt a temporary ground stop.

Immediate impact

By 3:30 p.m. on Thursday, 30% of departing flights had been delayed. Approximately 10% of the day’s flights were canceled according to a flight-tracking website. A ground stop was issued by the FAA from 1:20 p.m. to 2:45 p.m., which impacted flights due to both runway construction and poor weather conditions. Before the ground stop, there were already average delays of over three hours at Logan Airport.

Wider disruptions

FlightAware’s MiseryMap indicated that Boston was the only major U.S. airport with a majority of its flights delayed or canceled by 2 p.m. on Thursday. Massport issued a warning regarding ongoing flight delays shortly before 9 a.m. on Thursday, attributing them to weather and airfield construction. Passengers were advised to check the status of their flights online at https://bit.ly/3EgFqID.

Causes

The National Weather Service forecasted that Massachusetts could receive up to 3 inches of rain on Thursday, along with widespread showers and thunderstorms. Heavy rain caused flooding in southeastern Massachusetts on Thursday. The weather combined with a major construction project on Logan’s runways to slow aircraft traffic and reduce available capacity.

Runway construction details

The ongoing flight disruptions were worsened by a 75-day runway closure that began at the start of September, which Massport had previously warned travelers about. The construction was part of a plan for the installation of a new safety system designed to stop planes from overshooting the runway. There will be a second 75-day runway closure planned to start sometime after July 1, 2026.

Timeline of the day

• Shortly before 9 a.m.: Massport issued a warning regarding ongoing flight delays shortly before 9 a.m. on Thursday, attributing them to weather and airfield construction.
• By mid-afternoon: FlightAware’s MiseryMap indicated that Boston was the only major U.S. airport with a majority of its flights delayed or canceled by 2 p.m. on Thursday.
• 1:20 p.m. to 2:45 p.m.: A ground stop was issued by the FAA from 1:20 p.m. to 2:45 p.m., which impacted flights due to both runway construction and poor weather conditions.
• By 3:30 p.m.: By 3:30 p.m. on Thursday, 30% of departing flights had been delayed; approximately 10% of the day’s flights were canceled according to a flight-tracking website.

What travelers should do

Passengers affected by delays or cancellations are advised to check their flight status before traveling to the airport. Passengers were advised to check the status of their flights online at https://bit.ly/3EgFqID. Travelers should allow extra time for connections and expect extended processing times at the airport given reduced runway capacity and possible weather-related congestion.

Background and context

Logan Airport began a major runway closure at the start of September as part of upgrades to install a new safety system. The project was expected to reduce available runway capacity during the work period. Massport had previously warned of potential delays due to the construction project and bad weather conditions. The airport plans a second 75-day runway closure planned to start sometime after July 1, 2026, as part of the continued installation and safety upgrades.

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Quick reference table

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Additional Resources

• NBC Boston
• South Coast Today
• Boston Herald
• Boston Globe
• Travel and Tour World
• Wikipedia: Logan International Airport
• Google Search: Boston Logan Airport delays
• Google Scholar: flight delays
• Encyclopedia Britannica: Airport
• Google News: Boston Logan Airport

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