Seattle-Tacoma International Airport Ground Delay Averages 39 Minutes

The Federal Aviation Administration is metering arrivals into Seattle-Tacoma International Airport on Saturday, August 22, 2026, under a ground delay program caused by weather and low ceilings.

If you are flying into SEA from the contiguous United States or from several Canadian cities this morning and early afternoon Pacific time, treat the delay as a system slot problem at the destination, not as a problem that clears just because your origin city is sunny. Recheck your airline app before you leave for the airport and protect tight Seattle connects under the posted average delay near 39 minutes.

What the FAA posted for Sea-Tac

According to the FAA ATCSCC ground delay program advisory for SEA, the control element is the airport and the impacting condition is weather with low ceilings.

The advisory sets program rates of 38, then 42, across the cumulative window and covers all contiguous United States departures feeding SEA. It also includes Canadian departures from Vancouver, Victoria, Kelowna, Edmonton, and Calgary.

Comments state that arrivals use runways 16R and 16L and departures use runway 16L. That north-flow setup is common when low ceilings force instrument approaches into the airport from the south.

Maximum delay is listed at 98 minutes and average delay at 39 minutes. Those numbers are traffic-management assignments, not a promise that every flight lands exactly on that clock.

The same delay scale appears on the live FAA airport status page for SEA, which reports a traffic management program for weather and low ceilings with arriving flights delayed an average of 39 minutes.

For local weather context behind the ceilings, the National Weather Service observation for Seattle-Tacoma International Airport showed overcast skies around the program window while the FAA advisory remains the airport capacity decision.

Who feels a SEA program outside Seattle

A ground delay program meters arrivals by holding many flights at origin. Clear weather in Los Angeles, Denver, Chicago, or Atlanta does not cancel a SEA arrival slot assignment.

Alaska Airlines, Delta, United, Southwest, American, and regional partners all feed Sea-Tac. A delayed inbound can also cancel or delay the next outbound even after ceilings improve.

Travelers using SEA as a Pacific Northwest connection should treat sub-60-minute connects as high risk while the average delay sits near 39 minutes and the maximum sits near 98. Ask for protected later flights before you leave the origin gate.

If your trip continues by ferry, rental car, or a downtown hotel check-in, protect those windows with flexible cancellation. A 90-minute late arrival can push Bainbridge, Bremerton, or early afternoon hotel cutoffs into closed counter hours.

For carrier planning context while you wait, Deep Arrival keeps an Alaska Airlines baggage policy guide that many SEA travelers use, then still recheck live app status because a GDP overrides routine schedule marketing.

How low ceilings create program delays at SEA

Low ceilings force instrument approaches and can reduce how many aircraft Sea-Tac can accept each hour. Controllers then assign delay before takeoff so aircraft do not stack endlessly in holding patterns over Puget Sound.

A maximum delay of 98 minutes means some flights can be pushed by more than an hour and a half if their slot lands late in the program. That is why mid-day connections remain fragile even when the first morning departure looked fine.

The advisory also uses Time+45 language familiar to traffic managers when adjusting the program. Travelers should not treat the first delay assignment as frozen for the whole window.

Ground stops are a different tool. The load-bearing public document for SEA right now is this ground delay program. If a stop is later posted, it will appear as a separate advisory on the same FAA surfaces.

Airline weather waivers, if any, are separate products from the FAA traffic tools and close on their own clocks. Check your carrier app for change fee policies after you confirm whether your flight is still operating.

Practical steps for the rest of the SEA window

Start with the airline app for gate, aircraft, and cancellation status. Use the FAA advisory for the system reason code when an agent says weather at Seattle.

If you need a rebook, do it before the last bank of the program empties. Recovery after ceiling events can spill into later departures that then hit crew time limits.

Bags and connections deserve early attention. A late inbound under a 98 minute max delay can break a same-day ferry or Amtrak transfer even if the flight eventually lands. Build a backup plan for that ground leg before you leave the origin city.

Travelers still on the ground at origin should ask whether their flight is holding for a SEA arrival slot. Sitting at the gate with an open boarding door is better than taxiing into an indefinite hold when average delay is already near 40 minutes.

If your Seattle day is flexible, shifting to a later Pacific afternoon flight after the 2059Z window can be cleaner than fighting the midday stack. If your plans are meeting critical, stay on the protected itinerary and document delay notices for schedule changes.

For trip planning around a delayed Seattle arrival, Deep Arrival’s Seattle things to do guide helps resequence a shortened downtown day after you know your new landing time.

Keep watching the FAA advisory and your airline app until your flight has a firm departure or arrival time. Do not treat a short improvement in ceiling reports as all-clear while the ground delay program is still metering arrivals into Sea-Tac.