Seattle
SEA · KSEASeattle–Tacoma International Airport
Passengers a year
50.7M
#11 busiest in the U.S.
137
nonstop destinations
54
airlines
563
departures a day
79.5%
arrivals on time
1.1%
flights cancelled
83.0%
load factor
Airlines
Alaska Airlines is the largest carrier at Seattle, with 51% of all passengers. 54 airlines fly from here.
Share of passengers · each carrier as a slice of the whole airport
Alaska Airlines holds 51% of the airport — the 15th most concentrated of 30 large hubs. The nearest comparison is DCA at 54%.
| Airline | Share | Passengers | Seats YoY | ||
|---|---|---|---|---|---|
AS | 50.6% | 25.6M | 106 | 78.6% | -0.9% |
DL | 24.3% | 12.3M | 60 | 82.1% | +1.7% |
UA | 5.2% | 2.6M | 7 | 77.3% | -2% |
AA | 4.6% | 2.3M | 8 | 67.2% | +13.1% |
WN Southwest84% full | 4.3% | 2.2M | 13 | 68.9% | +1.9% |
+Other airlines | 11.1% | 5.6M | — | — | — |
Share, passengers and destinations count each airline’s own flights plus the regional flying sold under its brand. On-time covers the airline's own aircraft only — regional affiliates report to the government separately. Seats year on year compares the latest twelve months against the twelve before them.
Destinations
99 domestic and 38 international nonstop destinations from Seattle, across 27 countries.
87% domestic · 13% international · by departing passengers
Top domestic destinations
Alaska Airlines · Delta Air Lines · Southwest Airlines · American Airlines · Frontier Airlines
United Airlines · Alaska Airlines · Southwest Airlines · Delta Air Lines · Frontier Airlines
893.3K893,257 departing · 78% full
Alaska Airlines · Delta Air Lines · United Airlines · Frontier Airlines · American Airlines
Alaska Airlines · Delta Air Lines · Hawaiian Airlines
Alaska Airlines · United Airlines · American Airlines · Delta Air Lines
Alaska Airlines · Delta Air Lines · Southwest Airlines · Frontier Airlines
807.3K807,273 departing · 83% full
Alaska Airlines · United Airlines · Delta Air Lines
783.6K783,645 departing · 88% full
American Airlines · Alaska Airlines · Delta Air Lines
Alaska Airlines · Delta Air Lines
547.3K547,254 departing · 81% full
Delta Air Lines · Alaska Airlines · Frontier Airlines
Top international destinations
Taoyuan, Taiwan (TPE)
377.7K377,734 departing · 768.1K768,070 both ways
Eva Airways · Delta Air Lines · STARLUX AIRLINES · China Airlines
Seoul, South Korea (ICN)
312.3K312,286 departing · 622.3K622,256 both ways
Korean Air · Delta Air Lines · Asiana Airlines · Alaska Airlines · Hawaiian Airlines
Vancouver, Canada (YVR)
307.7K307,656 departing · 607.9K607,879 both ways
Alaska Airlines · Air Canada
London, United Kingdom (LHR)
275.5K275,500 departing · 541.2K541,199 both ways
British Airways · Delta Air Lines · Virgin Atlantic
Tokyo, Japan (HND)
164.4K164,383 departing · 331.4K331,428 both ways
Delta Air Lines · All Nippon Airways
Narita, Japan (NRT)
143.8K143,766 departing · 286.6K286,560 both ways
Japan Airlines · Hawaiian Airlines · Alaska Airlines
Amsterdam, Netherlands (AMS)
141.7K141,726 departing · 280.7K280,654 both ways
Delta Air Lines
Paris, France (CDG)
130.5K130,512 departing · 257.8K257,791 both ways
Delta Air Lines · Air France
Frankfurt am Main, Germany (FRA)
110.7K110,696 departing · 220.9K220,870 both ways
Lufthansa · Condor Flugdienst
Calgary, Canada (YYC)
105K105,034 departing · 212.7K212,729 both ways
WestJet · Alaska Airlines
All nonstop destinations
137 nonstop · 38 airlines · 99 domestic / 38 intl
Operated by Horizon Air, SkyWest Airlines
American Eagle · operated by Envoy Air, SkyWest Airlines
Delta Connection · operated by SkyWest Airlines
Aircraft
By share of departures at Seattle.
Body class · share of departures
- Regional
54,180 departures · 81% full
26.4%
- Narrowbody
34,663 departures · 84% full
16.9%
- Narrowbody
29,988 departures · 83% full
14.6%
- Narrowbody
27,973 departures · 84% full
13.6%
- Narrowbody
10,365 departures · 86% full
5.0%
- Narrowbody
7,849 departures · 84% full
3.8%
- Narrowbody
6,841 departures · 81% full
3.3%
- Narrowbody
6,125 departures · 86% full
3.0%
- Narrowbody
4,164 departures · 78% full
2.0%
- Narrowbody
3,805 departures · 83% full
1.8%
When Seattle is busiest
Departures by month over the trailing year. Bars scale to the busiest month.
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
May
Departures a month · peak July 2025
Annual passengers since 1990
Total passengers, arriving and departing, in every year on record.
Passengers a year
Every year
- 1990
- 17,015,701
- 1991
- 17,011,163
- 1992
- 18,377,230
- 1993
- 19,458,800
- 1994
- 21,736,144
- 1995
- 23,299,072
- 1996
- 24,612,917
- 1997
- 25,160,942
- 1998
- 26,149,039
- 1999
- 27,728,688
- 2000
- 28,120,811
- 2001
- 26,713,471
- 2002
- 26,609,937
- 2003
- 26,980,833
- 2004
- 28,886,457
- 2005
- 29,336,254
- 2006
- 30,061,173
- 2007
- 31,400,751
- 2008
- 32,065,097
- 2009
- 30,846,416
- 2010
- 31,028,402
- 2011
- 32,175,935
- 2012
- 32,377,551
- 2013
- 33,567,526
- 2014
- 35,928,488
- 2015
- 40,527,777
- 2016
- 44,031,008
- 2017
- 45,419,211
- 2018
- 48,180,684
- 2019
- 50,074,124
- 2020
- 18,979,545
- 2021
- 34,834,826
- 2022
- 44,414,265
- 2023
- 49,289,821
- 2024
- 50,992,488
- 2025
- 50,910,227
- 2026
- 18,898,242 so far
Arriving on time
Of every 100 flights landing at Seattle, 80 touch down within 15 minutes of schedule, 19 arrive late, and 1 is cancelled.
Every 100 arrivals
13 min
average delay
1,904
flights cancelled
163K
arrivals measured
What holds flights up
Share of delay minutes
Most reliable here
SkyWest Airlines 86%
Least reliable here
Hawaiian Airlines 60.3%
Among US airports
#11
On time, month by month
J
A
S
O
N
D
J
F
M
A
M
J
Darker is better · 69.8%–85.5%
The weak spot is December 2025, when 69.8% of arrivals landed on time — 9.7 points below the year. The strongest was April 2026 at 85.5%.
Frequently asked
How busy is Seattle–Tacoma International Airport (SEA)?
Seattle–Tacoma International Airport handled about 50.7M passengers over the trailing 12 months, ranking #11 among U.S. airports by passengers, with roughly 563 departures a day.
Which airline is the largest at Seattle–Tacoma International Airport (SEA)?
Alaska Airlines is the largest carrier at Seattle (SEA), flying about 51% of its passengers. 54 airlines serve Seattle in total.
How many places can you fly nonstop from Seattle–Tacoma International Airport (SEA)?
Seattle (SEA) has 137 nonstop destinations — 99 domestic and 38 international across 27 countries.
How often do flights arrive on time at Seattle–Tacoma International Airport (SEA)?
About 79.5% of flights arriving at Seattle (SEA) touch down within 15 minutes of schedule, per US DOT figures. About 1.1% are cancelled.
What aircraft flies most from Seattle–Tacoma International Airport (SEA)?
The Embraer E175 flew the largest share of departures from Seattle (SEA), about 26% of the total.
Trip reports on YouTube
Fliers post trip reports from flights through Seattle (SEA) to YouTube. These three were matched automatically from public YouTube listings — The Frequent Flier does not host, review, or endorse them.
AlaskaTripReports
!! FIRST ON YOUTUBE!! 🥳🥂🇬🇧 SEA-LHR INAUGURAL !! 787-9 DREAMLINER TRIP REPORT ALASKA AIRLINES
37:07 · Jun 2026
Genki's Travels
Alaska Airlines | B737-900ER | First Class | Atlanta (ATL) to Seattle (SEA) | Trip Report
27:42 · Mar 2025
QFS Aviation
JetBlue - A321 - Business Class - New York (JFK) to Seattle (SEA) | TRIP REPORT
24:45 · Feb 2023
Source: YouTube. Titles, thumbnails, and channel names come from YouTube. Playing a video loads the YouTube player, and using it means you agree to the YouTube Terms of Service; the Google Privacy Policy applies.
Departing counts passengers leaving Seattle; international destinations also show both directions. Data: traffic June 2025 – May 2026, on-time July 2025 – June 2026. Source: US DOT Bureau of Transportation Statistics (T-100 Segment, On-Time Performance).