Holiday travel
July 4 at IAH
George Bush Intercontinental Airport, Houston, TX. July 2023 – July 2026. Set against IAH’s own ordinary days of the same weekday in the weeks around each holiday.
The window, year by year
The window runs July 1 through July 5, around July 4, whatever weekday it falls on. In the data: Jul 1–5, 2023; Jul 1–5, 2024; Jul 1–5, 2025; Jul 1–5, 2026. July 4 fell on a Tuesday in 2023, Thursday in 2024, Friday in 2025, and Saturday in 2026. Four windows are in the data: enough to see whether a day repeats, not enough to call it a rule.
Compared with ordinary days, July 4 flights were better in two and about the same in two of the four years. The gap ran from 0.8 points above usual in 2025 to 10.0 points above usual in 2024.
0.74% of scheduled departures were cancelled across the July 4 windows, against 2.45% on ordinary days of the same weekdays. It was lower in all four years.
| Year | Departures | On time | Usual | Gap, points | Cancelled | Usual |
|---|---|---|---|---|---|---|
| 2023Jul 1–5, 2023 | 1,470 | 69.8% | 68.0% | +1.8about the same | 1.56% | 2.82% |
| 2024Jul 1–5, 2024 | 1,604 | 77.3% | 67.3% | +10.0better | 0.31% | 2.76% |
| 2025Jul 1–5, 2025 | 1,557 | 69.7% | 68.9% | +0.8about the same | 0.64% | 2.00% |
| 2026Jul 1–5, 2026 | 1,562 | 73.6% | 67.7% | +5.9better | 0.51% | 2.21% |
| All years4 windows | 6,193 | 72.7% | 68.0% | +4.7better | 0.74% | 2.45% |
Day by day
No day was the worst more than once: Sunday, Jul 2 in 2023, Monday, Jul 1 in 2024, Thursday, Jul 3 in 2025, and Sunday, Jul 5 in 2026.
July 3 (Mon, Wed, Thu, Fri) was the best day of the window in two of the four years. Over the years it ran 72.3% on time, 5.5 points above what ordinary days of the same weekdays had.
July 4 itself carried 19% fewer departures than an ordinary day of the same weekday and ran 82.5% on time.
- Better than usual
- Worse than usual
- About the same
- What ordinary days of the same weekday had
- Lowest to highest single year
- Lighter bars: days just outside the window
Bars show the on-time arrival rate and start at 30%, not zero.
| Day | Departures against an ordinary day | On time | Usual | Gap, points | Cancelled | Each year: 2023, 2024, 2025, 2026 |
|---|---|---|---|---|---|---|
| Jun 28Fri, Sat, Sun · outside the window | about the same | 78.7% | 67.3% | +11.4better | 1.11% | — · 75.0 · 75.9 · 85.2 |
| Jun 29Sat, Sun, Mon · outside the window | 2% more | 66.9% | 66.3% | +0.6about the same | 0.20% | — · 71.7 · 45.6 · 84.1 |
| Jun 30Sun, Mon, Tue · outside the window | about the same | 67.5% | 65.9% | +1.6about the same | 1.22% | — · 69.2 · 48.5 · 86.6 |
| Jul 1Sat, Mon, Tue, Wed | 3% fewer | 70.2% | 68.5% | +1.7about the same | 0.63% | 63.7 · 62.7 · 73.1 · 81.1 |
| Jul 2Sun, Tue, Wed, Thu | 3% fewer | 68.8% | 68.1% | +0.7about the same | 1.47% | 52.3 · 81.8 · 72.3 · 66.8 |
| Jul 3Mon, Wed, Thu, Fri | 6% fewer | 72.3% | 66.8% | +5.5better | 0.55% | 82.9 · 82.7 · 47.0 · 78.9 |
| July 4Tue, Thu, Fri, Sat | 19% fewer | 82.5% | 68.2% | +14.3better | 0.56% | 81.2 · 84.5 · 83.1 · 81.0 |
| Jul 5Wed, Fri, Sat, Sun | 2% fewer | 71.2% | 68.2% | +3.0better | 0.47% | 69.4 · 76.5 · 76.8 · 62.3 |
| Jul 6Thu, Sat, Sun, Mon · outside the window | about the same | 54.3% | 66.3% | −12.0worse | 3.09% | 35.3 · 42.8 · 71.6 · 63.9 |
| Jul 7Fri, Sun, Mon, Tue · outside the window | 2% fewer | 59.0% | 66.0% | −7.0worse | 3.11% | 73.3 · 37.3 · 64.5 · 59.4 |
| Jul 8Sat, Mon, Tue, Wed · outside the window | 2% fewer | 62.4% | 70.4% | −8.0worse | 26.23% | 67.1 · 35.3 · 38.9 · 81.4 |
A dash means fewer than 120 flights stood behind the figure, or behind the ordinary days it would be compared with: too few to print a rate, and nothing is estimated in its place. “Usual” is what ordinary days of the same weekday had at the same place in the weeks around the holiday, weighted by the flights being compared.
Which departure times held up
The busiest days at IAH were Sunday, Jul 2, 2023 (301 departures), Wednesday, Jul 5, 2023 (314 departures), Monday, Jul 1, 2024 (339 departures), Friday, Jul 5, 2024 (336 departures), Wednesday, Jul 2, 2025 (331 departures), Thursday, Jul 3, 2025 (346 departures), Thursday, Jul 2, 2026 (338 departures), and Sunday, Jul 5, 2026 (336 departures).
Across the whole window, flights leaving 5–9 AM had the highest on-time rate: 87.8%, 1.9 points above usual for that time of day. Those leaving 6–9 PM had the lowest: 61.4%, still 3.5 points above usual for that time of day.
The holiday helped flights leaving 12–3 PM the most (8.8 points above usual for that time of day) and those leaving 5–9 AM the least (1.9 points above).
On each year’s two busiest days, flights leaving 5–9 AM had the highest on-time rate: 86.2%, about level with usual for that time of day. Those leaving 6–9 PM had the lowest: 47.9%, 8.3 points below usual for that time of day.
Against usual for their time of day, flights leaving 12–3 PM did best (+2.9 points) and those leaving 3–6 PM did worst (−9.8 points).
| Leaving | On time, whole window | Usual | Gap, points | On time, busiest days | Usual | Gap, points |
|---|---|---|---|---|---|---|
| 5–9 AM | 87.8% | 85.9% | +1.9about the same | 86.2% | 85.9% | +0.3about the same |
| 9 AM–12 PM | 80.9% | 74.8% | +6.1better | 76.6% | 74.3% | +2.3about the same |
| 12–3 PM | 72.7% | 63.9% | +8.8better | 65.5% | 62.6% | +2.9about the same |
| 3–6 PM | 63.6% | 61.4% | +2.2about the same | 49.5% | 59.3% | −9.8worse |
| 6–9 PM | 61.4% | 57.9% | +3.5better | 47.9% | 56.2% | −8.3worse |
| 9 PM–5 AM | 68.0% | 65.1% | +2.9about the same | — | — | — |
Cancellations
The worst day for cancellations in each year was Sunday, Jul 2, 2023 (5.32% of that day’s departures, 70% of the window’s cancellations).
IAH beside every covered airport
Storms and outages move whole regions at once. This puts IAH’s year beside the year of all covered airports together, each against its own usual, to show whether IAH did better or worse than the network.
| Year | IAH on time | IAH, gap from usual | All airports on time | All airports, gap from usual |
|---|---|---|---|---|
| 2023Jul 1–5, 2023 | 69.8% | +1.8 | 73.9% | +2.9 |
| 2024Jul 1–5, 2024 | 77.3% | +10.0 | 82.2% | +11.7 |
| 2025Jul 1–5, 2025 | 69.7% | +0.8 | 73.5% | +2.3 |
| 2026Jul 1–5, 2026 | 73.6% | +5.9 | 73.1% | +3.2 |
For every holiday at once, see the five holidays at IAH, or the network view.