Flight Reliability
AA 518 · American Airlines
San Diego → Chicago (SAN–ORD)
91
Nerd Approved
WanderNerd Reliability Score
- 89%
- Arrive within 15 minutes
- 3 min early
- Average arrival delay
- 1.0%
- Cancelled
- 18 min early
- Median arrival delay
Based on 209 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
AA 518 arrived on time 93% of the time on Tuesdays and just 77% on Sundays. That gap is worth planning around.
Better than the SAN–ORD route average.
AA 518 arrived on time 89% of the time, versus 79% across the SAN–ORD route.
Better than the American Airlines network average.
AA 518 arrived on time 89% of the time, versus 77% across the American Airlines network.
Trending in the right direction.
AA 518 arrived on time 94% of the time over the last three months in the data, compared with 84% in the three months before that.
The breakdown
- Mon93%(28 flights)
- Tue93%(29 flights)
- Wed90%(30 flights)
- Thu90%(30 flights)
- Fri93%(29 flights)
- Sat87%(30 flights)
- Sun77%(30 flights)
94%
May
Jun 87% → May 94% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 87% | 30 |
| July 2025 | 86% | 29 |
| August 2025 | 80% | 30 |
| September 2025 | 87% | 30 |
| October 2025 | 94% | 31 |
| April 2026 | 96% | 24 |
| May 2026 | 94% | 31 |
- Departures on time
- 91%
- Diverted
- 0.5%
- Flights flown
- 206
- Months covered
- 8
Same route, other flights
Keep nerding
Based on 209 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.