Flight Reliability
DL 603 · Delta Air Lines
Houston → New York (IAH–LGA)89% of its flights flew this route. The rest (ATL–DAY, DAY–ATL) are included in these numbers.
- 65%
- Arrive within 15 minutes
- 30 min
- Average arrival delay
- 1.6%
- Cancelled
- 0 min
- Median arrival delay
Based on 187 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
DL 603 arrived on time 74% of the time on Wednesdays. On Sundays: 60%.
Lagging the IAH–LGA route.
DL 603 arrived on time 65% of the time, versus 73% across the IAH–LGA route.
Well behind the Delta Air Lines network.
DL 603 arrived on time 65% of the time, versus 81% across the Delta Air Lines network.
Recent months have been rougher.
DL 603 arrived on time 56% of the time over the last three months in the data, compared with 79% in the three months before that.
The breakdown
- Mon63%(32 flights)
- Tue63%(32 flights)
- Wed74%(27 flights)
- Thu63%(27 flights)
- Fri71%(28 flights)
- Sat—(1 flights)
- Sun60%(37 flights)
- 12–3 PM—(4 flights)
- 3–6 PM—(8 flights)
- 6–9 PM66%(172 flights)
Jun 44% → Dec 57% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 44% | 23 |
| July 2025 | 63% | 27 |
| August 2025 | 85% | 26 |
| September 2025 | 89% | 26 |
| October 2025 | 65% | 26 |
| November 2025 | 46% | 24 |
| December 2025 | 57% | 30 |
- Departures on time
- 60%
- Diverted
- 0%
- Flights flown
- 184
- Months covered
- 8
Same route, other flights
Keep nerding
Based on 187 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.