Partial coverage: domestic flights only · 151 of 151 periods have data
70 80 90 79.3
January 2014 March 2017 April 2020 June 2023 July 2026
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79.3% of 1,238 timed departures from Bill & Hillary Clinton National Airport/Adams Field left within 15 minutes of schedule in July 2026, according to the US BTS. Cancelled flights are excluded.
The most recent periods19 periods
Period
On-time departures 2025
On-time departures 2026
Change vs last year
January
82.2%
88.0%
▲ 7.0%
February
80.7%
86.7%
▲ 7.4%
March
82.6%
78.3%
▼ 5.2%
April
78.3%
82.7%
▲ 5.7%
May
74.5%
80.5%
▲ 8.0%
June
67.9%
76.7%
▲ 13.0%
July
70.7%
79.3%
▲ 12.2%
August
79.2%
–
–
September
86.5%
–
–
October
85.3%
–
in progress
November
84.1%
–
–
December
76.6%
–
–
Year-to-date average (Jan–Jul)
76.7%
81.7%
▲ 6.6%
Flight timing & delays
Historical departures, grouped by the scheduled local time at the departure airport. These are recorded outcomes, not a forecast for your flight.
US domestic sectors recorded by BTS
Source: the US BTS · Oct 12, 2024 → Jul 31, 2026
Lowest average delay06:00–07:005.2min · 2,322 recorded · 2,280 measured
Gap to highest-delay hour26.8min06:00 ↔ 20:00
Recorded flights23,461Bill & Hillary Clinton National Airport/Adams Field
Departure hour
On-time departuresPartial coverage: domestic flights only
100.050.00.0
00:0003:0006:0009:0012:0015:0018:0021:00
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Average departure delayPartial coverage: domestic flights only
32.016.00.0
00:0003:0006:0009:0012:0015:0018:0021:00
Hover, tap or focus a point to see its value, sample and source.
Recorded flightsPartial coverage: domestic flights only
2,7691,3850
00:0003:0006:0009:0012:0015:0018:0021:00
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View the figures
Departure hour
On-time departures
Average departure delay
With departure time
Recorded flights
00:00
No observations
—
—
—
01:00
No observations
—
—
—
02:00
No observations
—
—
—
03:00
No observations
—
—
—
04:00
No observations
—
—
—
05:00
91.6%
7.5 min
1,618
1,650
06:00
91.8%
5.2 min
2,280
2,322
07:00
85.3%
10.8 min
2,722
2,769
08:00
81.5%
11.0 min
1,159
1,174
09:00
87.4%
6.8 min
1,617
1,644
10:00
85.6%
7.2 min
880
892
11:00
80.3%
13.4 min
1,163
1,181
12:00
81.1%
13.6 min
1,690
1,727
13:00
82.4%
10.6 min
1,412
1,420
14:00
73.7%
18.1 min
833
842
15:00
73.1%
21.2 min
980
998
16:00
71.8%
21.3 min
1,899
1,947
17:00
75.6%
15.1 min
1,775
1,807
18:00
68.4%
22.9 min
1,770
1,824
19:00
67.6%
19.2 min
869
894
20:00
64.4%
32.0 min
334
350
21:00
Fewer than 200 measured departures
—
19
19
22:00
Fewer than 200 measured departures
—
1
1
23:00
No observations
—
—
—
Day of week
On-time departuresPartial coverage: domestic flights only
100.050.00.0
MonTueWedThuFriSatSun
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Average departure delayPartial coverage: domestic flights only
17.58.80.0
MonTueWedThuFriSatSun
Hover, tap or focus a point to see its value, sample and source.
Recorded flightsPartial coverage: domestic flights only
3,5661,7830
MonTueWedThuFriSatSun
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View the figures
Day of week
On-time departures
Average departure delay
With departure time
Recorded flights
Monday
79.2%
16.3 min
3,418
3,478
Tuesday
84.2%
10.1 min
3,169
3,215
Wednesday
83.4%
10.3 min
3,228
3,267
Thursday
79.7%
12.4 min
3,430
3,484
Friday
81.5%
13.1 min
3,370
3,448
Saturday
79.4%
13.8 min
2,914
3,003
Sunday
76.6%
17.5 min
3,492
3,566
Month of year
Months combine the same calendar month across the years shown; this is a seasonal pattern, not a monthly time series.
On-time departuresPartial coverage: domestic flights only
100.050.00.0
JanFebMarAprMayJunJulAugSepOctNovDec
Hover, tap or focus a point to see its value, sample and source.
Average departure delayPartial coverage: domestic flights only
21.310.60.0
JanFebMarAprMayJunJulAugSepOctNovDec
Hover, tap or focus a point to see its value, sample and source.
Recorded flightsPartial coverage: domestic flights only
2,4091,2050
JanFebMarAprMayJunJulAugSepOctNovDec
Hover, tap or focus a point to see its value, sample and source.
View the figures
Month of year
On-time departures
Average departure delay
With departure time
Recorded flights
Jan
85.2%
7.3 min
1,825
1,954
Feb
83.8%
11.5 min
1,737
1,768
Mar
80.3%
14.5 min
2,034
2,075
Apr
80.5%
14.0 min
2,203
2,239
May
77.7%
15.8 min
2,278
2,322
Jun
72.7%
21.3 min
2,321
2,361
Jul
75.2%
19.0 min
2,372
2,409
Aug
79.2%
12.0 min
1,107
1,119
Sep
86.5%
7.7 min
1,051
1,058
Oct
86.3%
8.3 min
1,912
1,914
Nov
86.0%
6.7 min
2,113
2,155
Dec
78.5%
15.9 min
2,068
2,087
Delay and on-time rates need at least 200 measured departures per bucket. Smaller samples remain visible in the flight-count chart. An empty slot means no observations, not zero flights.
Recorded outcomes
On time79.0%18,533
Delayed >15 min19.1%4,488
Cancelled1.9%440
Missing departure time0.0%0
All recorded flights with a known scheduled local time, counted once. Missing actual times are shown separately.
On time means departing no more than 15 minutes after schedule. Cancelled flights and flights missing departure times are excluded from the on-time rate and average delay.
Environment
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 122 tonnes of nitrogen oxides (NOₓ) and 7.1 tonnes of fine particles (PM2.5) from activity at Bill & Hillary Clinton National Airport/Adams Field, according to the EPA National Emissions Inventory.
Pollutant
Unit
2017
2020
2023
NOₓ (Nitrogen oxides)
tonnes
119
109
122
CO (Carbon monoxide)
tonnes
424
213
268
SO₂ (Sulphur dioxide)
tonnes
17.3
10.9
14.3
VOC (Volatile organic compounds)
tonnes
48.8
48.5
39.6
PM2.5 (Fine particles)
tonnes
8.2
8.4
7.1
PM10 (Particulate matter)
tonnes
9.0
8.9
7.7
Lead
kg
123
62.2
93.7
CO₂ (Carbon dioxide)
tonnes
30,468
27,048
—
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.