Flight Reliability
DL 3740 · Delta Air Lines
Boise → Seattle (BOI–SEA)96% of its flights flew this route. The rest (SLC–SBA) are included in these numbers.
89
Pretty Reliable
WanderNerd Reliability Score
- 84%
- Arrive within 15 minutes
- 0 min
- Average arrival delay
- 0.6%
- Cancelled
- 13 min early
- Median arrival delay
Based on 361 historical flights. Data through May 2026.
What the data says
The late departure is the smart one here.
DL 3740 departing between 9 PM–12 AM arrived on time 100% of the time, versus 82% between 9 AM–12 PM.
Thursdays have been rough.
DL 3740 arrived on time 92% of the time on Mondays and just 75% on Thursdays. That gap is worth planning around.
The breakdown
- Mon92%(52 flights)
- Tue90%(52 flights)
- Wed79%(52 flights)
- Thu75%(51 flights)
- Fri83%(52 flights)
- Sat86%(49 flights)
- Sun80%(51 flights)
- 6–9 AM84%(144 flights)
- 9 AM–12 PM82%(201 flights)
- 9 PM–12 AM100%(14 flights)
87%
May
Jun 80% → May 87% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 80% | 30 |
| July 2025 | 81% | 31 |
| August 2025 | 93% | 30 |
| September 2025 | 83% | 30 |
| October 2025 | 77% | 31 |
| November 2025 | 87% | 30 |
| December 2025 | 83% | 30 |
| January 2026 | 67% | 27 |
| February 2026 | 96% | 28 |
| March 2026 | 84% | 31 |
| April 2026 | 83% | 30 |
| May 2026 | 87% | 31 |
- Departures on time
- 91%
- Diverted
- 0%
- Flights flown
- 359
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 361 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.