AMS→SEA

Delta Air Lines is the only carrier the DOT report shows on AMS to SEA, with 1,139 flights and an average of 245 passengers aboard each. A single-carrier route gives a delayed passenger no same-day alternative on the same ticket, which is worth knowing before booking a tight onward connection.

The DOT's international report puts 124 flights on the pair in August 2025, the busiest month of the window, and 56 in February 2026, the thinnest. A summer-to-winter swing of that size means the winter schedule is a different operation: fewer frequencies, so a cancellation leaves a longer wait for the next seat.

EUROCONTROL's figures for Amsterdam Schiphol as a whole, every airline and every destination: 73.1% of departures and 78.3% of arrivals within 15 minutes of schedule from 1 January to 21 October 2026, with 94.6% of scheduled flights operated. The last seven days ran at 73.5% for departures, in line with the year. Air traffic flow management delay attributed to the airport averaged 2.8 minutes per arriving flight this year, 1.7 over the last week.

Every US route from Amsterdam Schiphol, and its full punctuality record

Seattle-Tacoma International is scored on this site from the DOT's domestic data: 79.5% of its 164,759 domestic departures arrived on time over the last twelve months, with delayed flights running about an hour late, and 0.93% were cancelled. Those are domestic flights, not this route, but an arriving transatlantic flight shares the same runways, the same weather and the same ground delay programmes, so a bad day at SEA reaches a flight from AMS just as surely. The airport's own page has the hour-by-hour and month-by-month detail, and its live FAA status appears above when the FAA has something to say.

Seattle-Tacoma International (SEA) delay statistics, hour by hour and month by month

Every flight that departs Amsterdam Schiphol falls under Regulation (EC) 261/2004, whichever airline flies it and wherever it lands. If it arrives at Seattle-Tacoma International three hours or more late, or is cancelled with under 14 days' notice, and the cause was within the airline's control, each passenger is owed €600 (€300 if the airline got you there under four hours late), on top of rebooking and care. Weather, air traffic control restrictions and strikes outside the airline are the usual exemptions. The return flight from SEA is covered only when the carrier is EU based. The sector is about 4,872 miles, 7,839 km, which puts it in the top distance band.

Delayed three hours or more? Check a claim with Compensair →

There is no grade to give AMS to SEA without a route record, and this site does not invent one. What the three sources support: about one departure a day in each direction, a single carrier, a departure airport that gets 73% of its departures away on time and an arrival airport that runs 80% on time domestically. Leave two hours for any onward connection at SEA; immigration comes before the connecting flight.

• Amsterdam Schiphol (AMS): every US route
• Seattle-Tacoma International (SEA) delay statistics
• AMS to JFK, New York (JFK)3,000 flights
• AMS to ATL, Atlanta (ATL)2,870 flights
• AMS to BOS, Boston (BOS)2,230 flights
• AMS to MSP, Minneapolis (MSP)2,032 flights
• LHR to SEA, from London2,643 flights
• KEF to SEA, from Reykjavík1,413 flights
• CDG to SEA, from Paris1,023 flights
• FRA to SEA, from Frankfurt856 flights
• Every Europe-to-US route and airport

Netherlands publishes no route-level punctuality, so this page cannot grade the route. The UK pages in this section can, because the CAA does.