Massport closed Runway 9/27 at Boston Logan on August 31 for a 75-day construction job, and most people flying through Logan this fall have no idea there’s an actual end date attached to it. They just know their flight keeps running late. On September 25 — three and a half weeks into the closure — Logan logged 457 delays and 30 cancellations, the worst single-airport total in the country that day. It wasn’t a one-off. Eleven days earlier, on September 14, Logan posted 412 delays and an average ground delay of 124 minutes. This isn’t a bad week. It’s a bad season with a calendar on it, and almost nobody’s publishing the calendar.

So here it is: the closure runs through mid-November. There’s a second phase coming after that, on a different construction year. And Logan isn’t even the airport with the most immediate deadline — San Francisco’s overlapping runway project actually finished first. Let’s get into why all three matter at once.

Quick Summary

Factor	Detail
What’s closed	Logan Runway 9/27, for EMAS (Engineered Materials Arresting System) installation
Closure dates	August 31 – mid-November 2026 (Massport is targeting completion before Thanksgiving)
Next phase	A second 75-day closure is planned for a future construction year
Worst Logan day so far	Sept 25: 457 delays, 30 cancellations
Worst avg. ground delay so far	Sept 14: 124 minutes
Nationwide, Sept 25	4,375 delays, 107 cancellations — FAA cited Logan, SFO, and Miami construction plus Newark volume controls
SFO Runway 1R	Closed since March 30, reopened early on Sept 29 — its own closure predates and outlasted nothing; it just ended before Logan’s does
Longer view	Houston Hobby runways closed into Dec 2026/Jan 2027; DFW’s 18L/36R closed until May 2027

What’s Actually Happening at Logan

The closure is narrower than “Logan lost a runway,” but it doesn’t feel narrow if you’re stuck on the tarmac. Crews are building a bridge deck at the end of Runway 27 rated to hold roughly a million pounds — about what a fully loaded 747 weighs — so it can support an Engineered Materials Arresting System, a bed of crushable, porous concrete-like material designed to stop an aircraft that overruns the end of the runway without a real emergency happening. Logan already has EMAS at two other runway ends; this makes a third.

Massport picked the timing on purpose, in consultation with the airlines, aiming to wrap before Thanksgiving rather than during it. That’s a reasonable call for the industry. It’s a lot less reassuring if your connection through Logan is on a Tuesday in October and the FAA has already put a ground delay program on the board twice that week.

Here’s the detail that actually matters and that most local coverage buries: this is phase one of two. Massport’s own airfield projects team has described it as a project that “spans two construction years, 75 calendar days each year.” Translation — Logan gets its runway back sometime around mid-November, and then loses it again for another 75-day stretch in a future year. Nobody’s published the exact dates for round two yet. If your travel plans regularly route through Logan, that’s worth bookmarking, not just this fall’s dates.

The Delay Numbers, Day by Day

Two data points tell most of the story. On September 14, Logan recorded 412 delays and 83 cancellations, with an FAA ground delay program in effect and average ground delays running 124 minutes — driven by the reduced arrival capacity from the closure, compounded that day by convective storm cells. Eleven days later, on September 25, the count was 457 delays and 30 cancellations, again the single worst airport total in the country that day, though the FAA’s reported average departure delay that day (15 minutes) was much shorter — cancellations were down, delays were up, and the mix shifts day to day depending on weather and traffic banks layered on top of the reduced runway capacity.

Neither of those was a freak day. They’re two samples from an ongoing pattern: with one fewer runway, Logan has less room to absorb a thunderstorm cell, a slow-moving front, or just a heavier-than-usual afternoon traffic bank. Good weather days at Logan this fall look close to normal. Bad weather days get ugly fast, and there’s nothing subtle about which days those will be — check the forecast for Boston, not just your departure city.

What September 25 Actually Exposed

On September 25, nationwide delays hit 4,375 with 107 cancellations — Southwest posted the worst carrier total of the day at 1,128 delays, with American at 583 and United at 453. The FAA pointed to three runway construction projects running at once — Logan, San Francisco, and Miami — stacked on top of ongoing volume controls at Newark, the same airport that had spent early September digging out from a severed fiber line that grounded 7,000 flights nationwide.

Here’s what gets lost when that day gets summarized as one big pile of bad numbers: only one of those four causes was actually a surprise. Newark’s cable cut was unpredictable by definition — nobody had that on a calendar. Logan’s closure and Miami’s construction were not. Massport posted its dates before Labor Day; Logan’s own closure has a published target of mid-November sitting in a press release right now. When coverage treats a scheduled 75-day runway project the same way it treats an accidental fiber cut — as sudden, unexplained turbulence — that’s not a capacity problem. It’s a reporting problem. The information needed to route around Logan’s slice of September 25 already existed. Almost nobody checked it before the day got bad.

How Does Logan’s Closure Compare to SFO and Miami’s?

1. Boston Logan (Runway 9/27): Closed August 31 through mid-November 2026 for EMAS installation, with a second 75-day phase planned for a future year. Still active as of this writing.
2. San Francisco (Runway 1R): Closed March 30 for a $215 million repaving and taxiway upgrade project, originally slated to run through October 2 — reopened five days early, on September 29, after roughly 40% of SFO flights ran delayed at points during the closure.
3. Miami International: Running its own overlapping runway and taxiway construction that the FAA named alongside Logan and SFO as a driver of the September 25 nationwide numbers, adding a third major hub to the same six-week window.

SFO is the one worth noting specifically, because its timeline cuts against the instinct to lump these together: its closure started five months before Logan’s and finished before Logan’s does, even after the early reopening. Logan is the one still running. If you’re routing a trip through late October and want to guess which of these three is most likely to still be constrained, Logan is the safer bet — it’s the one with a confirmed mid-November end date, not an already-closed one.

The Bigger Pattern: This Isn’t a 2026 Blip

Zoom out past this fall and the picture gets less reassuring, not more. Houston Hobby has one runway closed until December 31, 2026 and another until January 9, 2027. Dallas/Fort Worth’s Runway 18L/36R is closed until May 2027. Add Logan’s second EMAS phase, still undated, and you’ve got a rolling multi-year backlog of runway and taxiway rehabilitation at some of the country’s busiest airports, not a single unlucky season at one airport. Infrastructure built decades ago is getting worked on now, mostly because it has to be, and the country doesn’t have enough redundant runway capacity at major hubs to absorb that work without travelers feeling it.

None of this is new information to the FAA or to the airports running these projects — they’ve published the schedules. It’s just not information most travelers see until they’re already sitting at the gate wondering why their flight has been delayed three times.

What to Actually Do If You’re Flying Through Logan This Fall

Book earlier flights when you have a choice. Delay counts and ground delay programs both skew toward afternoon and evening at Logan right now — a 7am departure has more schedule padding ahead of it before the day’s delays compound.

Build real connection time if Logan is a layover, not an origin or destination. A 45-minute connection through a runway-constrained airport during an active ground delay program is a bet you don’t need to take when you can pick a different flight.

Check your credit card’s trip delay coverage before assuming the airline owes you anything. Construction-driven delays aren’t a mechanical failure or a crew issue — most carriers will code them as outside their control, so a hotel or meal voucher from the airline isn’t guaranteed the way it might be for a maintenance delay.

If a tight connection through Logan is unavoidable, know your options at the checkpoint before you’re standing in it. Standard security lines run roughly 20 minutes during the 6–9am peak — the same window ground delay programs are most likely to be active — while TSA PreCheck averages closer to 7. CLEAR is available at Terminals A, B, and E. And if you’re arriving by rideshare, the Uber and Lyft fixed-route shuttles that launched in April now come with a Ticket to Skip pass for expedited screening, and travelers on participating airlines can check bags and clear TSA at a remote terminal in Framingham before riding a $9 secure bus straight to gates at Terminals A and C. None of that fixes a closed runway, but it buys back the minutes a ground delay program eats out of a short connection.

If you’re flying SFO or Miami instead, don’t assume you’re in the clear. SFO’s worst of it is over now that 1R reopened, but Miami’s construction is still running, and national ripple effects from Logan and Newark can hit your itinerary even if your own airport looks fine on paper.

The Bottom Line

Logan’s runway closure has an end date — mid-November, with Massport aiming to beat Thanksgiving — and Massport has said so publicly since before the closure even started. That’s the detail most delay coverage skips past on its way to the daily numbers. If your travel touches Logan before mid-November, plan around morning departures, build in real connection time, and know your options at the checkpoint if that time gets eaten anyway. Phase two doesn’t have a date yet. Check Massport’s page again in a few months, because this fall’s schedule won’t be the last one.

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Details current as of September 26, 2026, based on reporting from Massport, NBC Boston, Boston.com, The Traveler, and TravelTourister. Delay and cancellation figures are daily snapshots and will vary; check FlightAware or your airline directly before traveling.