Flight Reliability
DL 3749 · Delta Air Lines
LWS → Seattle (LWS–SEA)
96
Nerd Approved
WanderNerd Reliability Score
- 92%
- Arrive within 15 minutes
- 5 min early
- Average arrival delay
- 0.3%
- Cancelled
- 13 min early
- Median arrival delay
Based on 364 historical flights. Data through May 2026.
What the data says
Thursday is the weak spot.
DL 3749 arrived on time 96% of the time on Wednesdays. On Thursdays: 89%.
Better than the Delta Air Lines network average.
DL 3749 arrived on time 92% of the time, versus 81% across the Delta Air Lines network.
It basically never cancels.
Out of 364 scheduled flights, only 0.3% were cancelled.
Trending in the right direction.
DL 3749 arrived on time 98% of the time over the last three months in the data, compared with 86% in the three months before that.
The breakdown
- Mon92%(49 flights)
- Tue90%(52 flights)
- Wed96%(50 flights)
- Thu89%(52 flights)
- Fri92%(52 flights)
- Sat90%(52 flights)
- Sun94%(53 flights)
97%
May
Jun 83% → May 97% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 83% | 30 |
| July 2025 | 100% | 31 |
| August 2025 | 97% | 30 |
| September 2025 | 93% | 30 |
| October 2025 | 90% | 31 |
| November 2025 | 87% | 30 |
| December 2025 | 83% | 30 |
| January 2026 | 90% | 30 |
| February 2026 | 86% | 28 |
| March 2026 | 100% | 29 |
| April 2026 | 97% | 30 |
| May 2026 | 97% | 31 |
- Departures on time
- 93%
- Diverted
- 0.8%
- Flights flown
- 360
- Months covered
- 12
Keep nerding
Based on 364 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.