Airport · ILG · Wilmington, Delaware
Wilmington, DE
Wilmington, DE posts bottom-quartile on-time performance among the 382 tracked U.S. airports, as a smaller regional airport. According to the U.S. DOT Bureau of Transportation Statistics, drawn from 330 flights (2020–2025); its biggest delay driver is nas.
Data updated 2026-06-13
- 69.1%
- On-time
- Top 99%
- on-time, US airports
- 70 min
- Delay when late
- 2.12%
- Cancelled
Key Performance Metrics
Total Flights
330
Best Month
May 95%
Worst Month
Dec 72.2%
Delayed
102
Cancelled
7
ILG on-time rate vs. the national average
Behind the U.S. average across all 382 tracked airports.
Where ILG sits among all 382 tracked airports
ILG's 69.1% on-time rate falls in the 65-70% band, the 4-airport band it shares.
National on-time-rate distribution
- 60-65% 1
1 airport between 60% and 65% on-time
1 airports
- 65-70% 4
4 airports between 65% and 70% on-time
4 airports
- 70-75% 9
9 airports between 70% and 75% on-time
9 airports
- 75-80% 48
48 airports between 75% and 80% on-time
48 airports
- 80-85%
192 airports between 80% and 85% on-time
192 airports
- 85-90%
116 airports between 85% and 90% on-time
116 airports
- 90-95% 12
12 airports between 90% and 95% on-time
12 airports
What this shows ILG is marked in the 65-70% band.
Delay Cause Breakdown
Top delay cause: NAS. Total delay minutes: 4,416.
ILG - seasonal on-time pattern
Best: May (95%) · worst: December (72.2%)
Seasonal Performance Patterns
Monthly averages across all years of data. Best month: May (95% on-time). Most delays: December (72.2% on-time).
| Month | Avg Flights | Avg Delayed | Avg Cancelled | On-Time % |
|---|---|---|---|---|
| December | 18 | 10 | 1 | 72.2% |
| November | 16 | 8 | 0 | 75% |
| October | 22 | 5 | 0 | 86.4% |
| September | 16 | 5 | 0 | 81.3% |
| August | 24 | 3 | 1 | 87.5% |
| July | 24 | 12 | 0 | 75% |
| June | 13 | 5 | 0 | 76.9% |
| May | 20 | 2 | 1 | 95% |
| April | 27 | 10 | 1 | 77.8% |
| March | 20 | 6 | 1 | 85% |
| February | 16 | 4 | 0 | 84.4% |
| January | 18 | 5 | 1 | 83.3% |
Year-Over-Year Performance
Annual flight volume and on-time trends at ILG.
ILG - on-time rate by year
2021–2022, year-over-year trend.
| Year | Flights | Delayed | Cancelled | On-Time % |
|---|---|---|---|---|
| 2022 | 94 | 21 | 5 | 77.7% |
| 2021 | 236 | 37 | 2 | 84.3% |
Cancellation & Diversion Analysis
Flight disruption statistics for Wilmington, DE.
Cancellation Rate
2.12%
7 of 330 flights
Diversion Rate
0.00%
0 of 330 flights
Delay Rate
30.9%
102 of 330 flights
Monthly Performance
Recent 24 months of flight data.
| Period | Flights | Dep Delayed | Arr Delayed | Cancelled | Diverted |
|---|---|---|---|---|---|
| Jun 2022 | 2 | 1 | 1 | 0 | 0 |
| May 2022 | 16 | 0 | 0 | 2 | 0 |
| Apr 2022 | 26 | 9 | 7 | 1 | 0 |
| Mar 2022 | 16 | 5 | 5 | 1 | 0 |
| Feb 2022 | 16 | 3 | 2 | 0 | 0 |
| Jan 2022 | 18 | 3 | 2 | 1 | 0 |
| Dec 2021 | 18 | 5 | 5 | 1 | 0 |
| Nov 2021 | 16 | 4 | 4 | 0 | 0 |
| Oct 2021 | 22 | 3 | 2 | 0 | 0 |
| Sep 2021 | 16 | 3 | 2 | 0 | 0 |
| Aug 2021 | 24 | 3 | 0 | 1 | 0 |
| Jul 2021 | 24 | 6 | 6 | 0 | 0 |
| Jun 2021 | 24 | 5 | 3 | 0 | 0 |
| May 2021 | 24 | 2 | 2 | 0 | 0 |
| Apr 2021 | 28 | 3 | 1 | 0 | 0 |
| Mar 2021 | 24 | 1 | 1 | 0 | 0 |
| Feb 2021 | 16 | 2 | 1 | 0 | 0 |
Airports With a Similar On-Time Rate
Other U.S. airports nationwide whose on-time rate is closest to Wilmington, DE's 69.1%.
Keep exploring
More flight data around Wilmington, DE.
Delaware flight data
Statewide on-time and delay aggregates, plus every reporting airport in Delaware.
View DE data →Airport rankings
See where ILG sits among U.S. airports on on-time rate and average delay.
Best on-time airports →Compare airports
Put ILG head-to-head with another airport on delays and reliability.
Open comparison tool →What the Data Says About ILG
Wilmington, DE in Wilmington, Delaware handled 330 flights in the Bureau of Transportation Statistics dataset between 2021 and 2022, posting a 69.1% on-time departure rate. Of those flights, 102 experienced delays, 7 were cancelled, and 0 were diverted. The cancellation rate works out to 2.12%, the diversion rate to 0.00%, and the average delay when departures run late is 70.4 minutes. These figures are the baseline for comparing ILG against other airports in the same state and nationally.
Breaking down what drives delays at ILG, NAS leads the pack. NAS (National Aviation System) accounts for 40.3% of total delay minutes, followed by Late Aircraft at 39.2% and Carrier at 20.6%. Weather contributes 0.0% of delay minutes at this airport, while security holds the smallest share at 0.0%. Travelers often overestimate the weather share; the BTS categorization shows late-arriving aircraft and carrier operations as the larger contributors.
Seasonally, May runs the cleanest at ILG with a 95% on-time rate, while December is the roughest at 72.2% - a 23-point swing between best and worst month. Volume peaks in April, when average flights hit 27. Combine these numbers - 69.1% on-time, 70.4-minute average delay, 2.12% cancellation rate, and you have a concrete picture of departure reliability at Wilmington, DE.
Frequently Asked Questions
What is the on-time performance rate at Wilmington, DE (ILG)? ▼
What is the most common cause of delays at ILG? ▼
What is the average delay time at ILG? ▼
What is the best month to fly from ILG? ▼
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How many routes operate from ILG? ▼
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Flight Guides
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Using ILG's data
An airport-level on-time rate is a starting point, not a guarantee for your specific flight.
- Compare ILG against airports with a similar on-time rate. Compare airports
- Travel in May rather than December if your dates are flexible. Seasonal patterns
- Scores vary by airline and route within the same airport; check the specific carrier you're flying. Browse airlines
On-time rate reflects the BTS historical average across all reporting carriers at this airport, not any single flight or airline.
Related
Source: U.S. Bureau of Transportation Statistics (BTS) Airline on-time performance and operational reliability · 2025
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. Airport figures are computed directly from BTS On-Time Performance data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.