Seattle King County International Airport - Boeing Field (BFI)
King County International Airport - Boeing Field handled 7,570 passengers in July 2026, up 44.7% on a year earlier, according to the US BTS.
Flights (arrivals + departures) over time
Data Integrity
The most recent periods19 periods
| Period | Flights (arrivals + departures) 2025 | Flights (arrivals + departures) 2026 | Change vs last year |
|---|---|---|---|
| January | 647 | 929 | ▲ 43.6% |
| February | 638 | 835 | ▲ 30.9% |
| March | 810 | 750 | ▼ 7.4% |
| April | 757 | 827 | ▲ 9.2% |
| May | 970 | 1,304 | ▲ 34.4% |
| June | 1,242 | 1,415 | ▲ 13.9% |
| July | 1,534 | 1,506 | ▼ 1.8% |
| August | 1,542 | – | – |
| September | 1,332 | – | – |
| October | 1,268 | – | in progress |
| November | 985 | – | – |
| December | 1,066 | – | – |
| Year to date (Jan–Jul) | 6,598 | 7,566 | ▲ 14.7% |
Passengers over time
Data Integrity
The most recent periods19 periods
| Period | Passengers 2025 | Passengers 2026 | Change vs last year |
|---|---|---|---|
| January | 3,185 | 3,582 | ▲ 12.5% |
| February | 2,605 | 2,564 | ▼ 1.6% |
| March | 5,622 | 3,711 | ▼ 34.0% |
| April | 4,319 | 4,222 | ▼ 2.2% |
| May | 3,936 | 5,258 | ▲ 33.6% |
| June | 5,494 | 6,096 | ▲ 11.0% |
| July | 5,231 | 7,570 | ▲ 44.7% |
| August | 7,179 | – | – |
| September | 5,379 | – | – |
| October | 6,975 | – | in progress |
| November | 4,428 | – | – |
| December | 4,136 | – | – |
| Year to date (Jan–Jul) | 30,392 | 33,003 | ▲ 8.6% |
Tonnes of cargo over time
Data Integrity
The most recent periods19 periods
| Period | Tonnes of cargo 2025 | Tonnes of cargo 2026 | Change vs last year |
|---|---|---|---|
| January | 6,895 | 6,940 | ▲ 0.7% |
| February | 6,718 | 6,522 | ▼ 2.9% |
| March | 7,034 | 7,214 | ▲ 2.6% |
| April | 7,518 | 7,354 | ▼ 2.2% |
| May | 7,348 | 7,305 | ▼ 0.6% |
| June | 7,498 | 7,272 | ▼ 3.0% |
| July | 8,643 | 7,595 | ▼ 12.1% |
| August | 7,457 | – | – |
| September | 7,222 | – | – |
| October | 8,065 | – | in progress |
| November | 7,034 | – | – |
| December | 9,567 | – | – |
| Year to date (Jan–Jul) | 51,653 | 50,201 | ▼ 2.8% |
Seats offered over time
Data Integrity
The most recent periods19 periods
| Period | Seats offered 2025 | Seats offered 2026 | Change vs last year |
|---|---|---|---|
| January | 6,845 | 13,331 | ▲ 94.8% |
| February | 6,546 | 8,575 | ▲ 31.0% |
| March | 15,718 | 13,101 | ▼ 16.6% |
| April | 10,929 | 10,457 | ▼ 4.3% |
| May | 9,017 | 14,919 | ▲ 65.5% |
| June | 13,968 | 14,611 | ▲ 4.6% |
| July | 11,341 | 16,323 | ▲ 43.9% |
| August | 13,436 | – | – |
| September | 13,276 | – | – |
| October | 17,367 | – | in progress |
| November | 11,147 | – | – |
| December | 11,403 | – | – |
| Year to date (Jan–Jul) | 74,364 | 91,317 | ▲ 22.8% |
Domestic / International
July 2026- Domestic 99.3% 1,496
- International 0.7% 10
Domestic / International — flights (arrivals + departures)
Domestic
Data Integrity
The most recent periods19 periods
| Period | Flights (arrivals + departures) 2025 | Flights (arrivals + departures) 2026 | Change vs last year |
|---|---|---|---|
| January | 623 | 906 | ▲ 45.4% |
| February | 614 | 824 | ▲ 34.2% |
| March | 773 | 730 | ▼ 5.6% |
| April | 747 | 806 | ▲ 7.9% |
| May | 957 | 1,288 | ▲ 34.6% |
| June | 1,228 | 1,395 | ▲ 13.6% |
| July | 1,518 | 1,496 | ▼ 1.4% |
| August | 1,518 | – | – |
| September | 1,317 | – | – |
| October | 1,230 | – | in progress |
| November | 962 | – | – |
| December | 1,045 | – | – |
| Year to date (Jan–Jul) | 6,460 | 7,445 | ▲ 15.2% |
International
Data Integrity
The most recent periods19 periods
| Period | Flights (arrivals + departures) 2025 | Flights (arrivals + departures) 2026 | Change vs last year |
|---|---|---|---|
| January | 24 | 23 | ▼ 4.2% |
| February | 24 | 11 | ▼ 54.2% |
| March | 37 | 20 | ▼ 45.9% |
| April | 10 | 21 | ▲ 110.0% |
| May | 13 | 16 | ▲ 23.1% |
| June | 14 | 20 | ▲ 42.9% |
| July | 16 | 10 | ▼ 37.5% |
| August | 24 | – | – |
| September | 15 | – | – |
| October | 38 | – | in progress |
| November | 23 | – | – |
| December | 21 | – | – |
| Year to date (Jan–Jul) | 138 | 121 | ▼ 12.3% |
Domestic / International — passengers
Domestic
Data Integrity
The most recent periods19 periods
| Period | Passengers 2025 | Passengers 2026 | Change vs last year |
|---|---|---|---|
| January | 2,610 | 2,861 | ▲ 9.6% |
| February | 2,170 | 2,436 | ▲ 12.3% |
| March | 4,836 | 3,114 | ▼ 35.6% |
| April | 4,120 | 3,758 | ▼ 8.8% |
| May | 3,572 | 5,220 | ▲ 46.1% |
| June | 5,454 | 6,003 | ▲ 10.1% |
| July | 5,195 | 7,474 | ▲ 43.9% |
| August | 7,018 | – | – |
| September | 5,339 | – | – |
| October | 5,210 | – | in progress |
| November | 3,919 | – | – |
| December | 3,731 | – | – |
| Year to date (Jan–Jul) | 27,957 | 30,866 | ▲ 10.4% |
International
Data Integrity
The most recent periods19 periods
| Period | Passengers 2025 | Passengers 2026 | Change vs last year |
|---|---|---|---|
| January | 575 | 721 | ▲ 25.4% |
| February | 435 | 128 | ▼ 70.6% |
| March | 786 | 597 | ▼ 24.0% |
| April | 199 | 464 | ▲ 133.2% |
| May | 364 | 38 | ▼ 89.6% |
| June | 40 | 93 | ▲ 132.5% |
| July | 36 | 96 | ▲ 166.7% |
| August | 161 | – | – |
| September | 40 | – | – |
| October | 1,765 | – | in progress |
| November | 509 | – | – |
| December | 405 | – | – |
| Year to date (Jan–Jul) | 2,435 | 2,137 | ▼ 12.2% |
Domestic / International — seats offered
Domestic
Data Integrity
The most recent periods19 periods
| Period | Seats offered 2025 | Seats offered 2026 | Change vs last year |
|---|---|---|---|
| January | 5,939 | 11,491 | ▲ 93.5% |
| February | 5,450 | 8,373 | ▲ 53.6% |
| March | 13,955 | 11,115 | ▼ 20.4% |
| April | 10,061 | 9,078 | ▼ 9.8% |
| May | 8,558 | 14,381 | ▲ 68.0% |
| June | 13,838 | 13,754 | ▼ 0.6% |
| July | 10,965 | 16,151 | ▲ 47.3% |
| August | 13,022 | – | – |
| September | 12,816 | – | – |
| October | 14,470 | – | in progress |
| November | 9,716 | – | – |
| December | 9,459 | – | – |
| Year to date (Jan–Jul) | 68,766 | 84,343 | ▲ 22.7% |
International
Data Integrity
The most recent periods19 periods
| Period | Seats offered 2025 | Seats offered 2026 | Change vs last year |
|---|---|---|---|
| January | 906 | 1,840 | ▲ 103.1% |
| February | 1,096 | 202 | ▼ 81.6% |
| March | 1,763 | 1,986 | ▲ 12.6% |
| April | 868 | 1,379 | ▲ 58.9% |
| May | 459 | 538 | ▲ 17.2% |
| June | 130 | 857 | ▲ 559.2% |
| July | 376 | 172 | ▼ 54.3% |
| August | 414 | – | – |
| September | 460 | – | – |
| October | 2,897 | – | in progress |
| November | 1,431 | – | – |
| December | 1,944 | – | – |
| Year to date (Jan–Jul) | 5,598 | 6,974 | ▲ 24.6% |
Load factor (computed)
Data Integrity
Passengers ÷ seats offered, both as reported by the US BTS for the same months. Computed by us; the two source series are shown on this page.
The most recent periods19 periods
| Period | Load factor 2025 | Load factor 2026 | Change vs last year |
|---|---|---|---|
| January | 46.5% | 26.9% | ▼ 42.3% |
| February | 39.8% | 29.9% | ▼ 24.9% |
| March | 35.8% | 28.3% | ▼ 20.8% |
| April | 39.5% | 40.4% | ▲ 2.2% |
| May | 43.7% | 35.2% | ▼ 19.3% |
| June | 39.3% | 41.7% | ▲ 6.1% |
| July | 46.1% | 46.4% | ▲ 0.5% |
| August | 53.4% | – | – |
| September | 40.5% | – | – |
| October | 40.2% | – | in progress |
| November | 39.7% | – | – |
| December | 36.3% | – | – |
| Year-to-date average (Jan–Jul) | 41.5% | 35.5% | ▼ 14.4% |
Seasonality · flights (arrivals + departures) by month
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2024 | 603 | 558 | 653 | 702 | 832 | 947 | 1,206 | 1,162 | 977 | 899 | 705 | 840 |
| 2025 | 647 | 638 | 810 | 757 | 970 | 1,242 | 1,534 | 1,542 | 1,332 | 1,268 | 985 | 1,066 |
| 2026 | 929 | 835 | 750 | 827 | 1,304 | 1,415 | 1,506 |
International share 1% of flights (arrivals + departures) in July 2026
Series depth 36 years from 1990
Our own count, day by day
We counted 9,322 departures and arrivals at King County International Airport - Boeing Field over the last 32 complete days, from the airport's own public flight board.
Our own count · not official · not comparable with the figure above Partial coverage: only flights tracked by volunteer radio receivers · 32 of 32 periods have data
Partial coverage: only flights tracked by volunteer radio receivers · 2 of 2 periods have data
Short series — months has only 2 months so far. Enough to show the level now, not enough to read a trend.
Sum of our daily count. “n/N days” = incomplete period.
Partial coverage: only flights tracked by volunteer radio receivers · 1 of 1 periods have data
Short series — quarters has only 1 quarters so far. Enough to show the level now, not enough to read a trend.
Sum of our daily count. “n/N days” = incomplete period.
Partial coverage: only flights tracked by volunteer radio receivers · 1 of 1 periods have data
Short series — years has only 1 years so far. Enough to show the level now, not enough to read a trend.
Sum of our daily count. “n/N days” = incomplete period.
The most recent periods30 periods
30 of 30
| Period | Flights counted | 7-day total |
|---|---|---|
| Aug 31, 2026 | 295 | 2,056 |
| Aug 30, 2026 | 277 | 2,052 |
| Aug 29, 2026 | 220 | 2,083 |
| Aug 28, 2026 | 331 | 2,076 |
| Aug 27, 2026 | 319 | 2,051 |
| Aug 26, 2026 | 300 | 2,075 |
| Aug 25, 2026 | 314 | 2,056 |
| Aug 24, 2026 | 291 | 2,053 |
| Aug 23, 2026 | 308 | 2,082 |
| Aug 22, 2026 | 213 | 2,107 |
| Aug 21, 2026 | 306 | 2,167 |
| Aug 20, 2026 | 343 | 2,135 |
| Aug 19, 2026 | 281 | 2,134 |
| Aug 18, 2026 | 311 | 2,204 |
| Aug 17, 2026 | 320 | 2,224 |
| Aug 16, 2026 | 333 | 2,249 |
| Aug 15, 2026 | 273 | 2,237 |
| Aug 14, 2026 | 274 | 2,245 |
| Aug 13, 2026 | 342 | 2,334 |
| Aug 12, 2026 | 351 | 2,300 |
| Aug 11, 2026 | 331 | 2,267 |
| Aug 10, 2026 | 345 | 2,241 |
| Aug 9, 2026 | 321 | 2,192 |
| Aug 8, 2026 | 281 | 2,102 |
| Aug 7, 2026 | 363 | 2,030 |
| Aug 6, 2026 | 308 | 1,679 |
| Aug 5, 2026 | 318 | |
| Aug 4, 2026 | 305 | |
| Aug 3, 2026 | 296 | |
| Aug 2, 2026 | 231 |
Environment
Airport Carbon Accreditation
Level 3 King County International Airport - Boeing Field holds Airport Carbon Accreditation Level 3 (status checked October 2026), according to the programme's public list.
A certification of how the airport operator manages its own carbon emissions (levels 1–5, "+" = with offsetting). It is not a measure of how much the airport or its flights emit.Airport Carbon Accreditation (ACI)
Air pollutants at the airport (EPA estimate)
Modelled estimate, not a measurement: aircraft below 3,000 ft (landing and take-off), ground support equipment and auxiliary power units, plus any stationary sources the state reported at the airport site. Cruise emissions are not included.In 2023, the US EPA estimated 54.2 tonnes of nitrogen oxides (NOₓ) and 9.7 tonnes of fine particles (PM2.5) from activity at King County International Airport - Boeing Field, according to the EPA National Emissions Inventory.
| Pollutant | Unit | 2017 | 2020 | 2023 |
|---|---|---|---|---|
| NOₓ (Nitrogen oxides) | tonnes | 80.3 | 43.2 | 54.2 |
| CO (Carbon monoxide) | tonnes | 521 | 379 | 382 |
| SO₂ (Sulphur dioxide) | tonnes | 9.9 | 5.3 | 6.2 |
| VOC (Volatile organic compounds) | tonnes | 34.4 | 41.2 | 28.2 |
| PM2.5 (Fine particles) | tonnes | 11.1 | 8.4 | 9.7 |
| PM10 (Particulate matter) | tonnes | 13.1 | 9.8 | 11.3 |
| Lead | kg | 359 | 251 | 285 |
| CO₂ (Carbon dioxide) | tonnes | 15,171 | 28,353 | — |
The inventory is published every three years. Coverage changes between editions (about 19,300 airport sites in 2017, 6,000 in 2020, 12,700 in 2023), 2020 reflects the pandemic drop in traffic, and EPA updates its aircraft model between editions — so the columns are not a trend (Los Angeles: 3,562 tonnes of NOₓ in 2017, 8,810 in 2023). CO₂ is only reported for some sites in 2017, for all sites in 2020, and not at all in 2023. EPA publishes US customary units; converted here to metric tonnes (× 0.907) and, for lead, kilograms.
US EPA — National Emissions Inventory