About 1 in 19 DL 4099 flights from Los Angeles arrived 15+ minutes late, diverted or cancelled over the past year (5%); 0.5% were cancelled. The typical flight landed 16 minutes early.
DL 4099: LAX → RNO
Scheduled to leave Los Angeles at 8:20 a.m. local time, operated by SkyWest as OO 4099. Over the past year it arrived on time 95% of the time (365 flights), in line with other DL flights on the route at that hour (97%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 53 | 98% |
| Tuesday | 52 | 96% |
| Wednesday | 52 | 92% |
| Thursday | 52 | 94% |
| Friday | 52 | 92% |
| Saturday | 52 | 94% |
| Sunday | 52 | 96% |
Why it was late
All flights LAX → RNO · Connecting off DL 4099? Check the risk
DL 4099: RNO → LAX
Scheduled to leave Reno at 10:34 a.m. local time, operated by SkyWest as OO 4099. Over the past year it arrived on time 92% of the time (365 flights), in line with other DL flights on the route at that hour (94%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 53 | 96% |
| Tuesday | 52 | 90% |
| Wednesday | 52 | 88% |
| Thursday | 52 | 92% |
| Friday | 52 | 90% |
| Saturday | 52 | 88% |
| Sunday | 52 | 94% |
Why it was late
All flights RNO → LAX · Connecting off DL 4099? Check the risk
Questions
How often is DL 4099 from LAX to RNO late?
Delta Air Lines 4099 from Los Angeles, CA to Reno, NV arrived 15 or more minutes late, was diverted or was cancelled on 5% of 365 scheduled flights between September 2025 and August 2026. 0.5% were cancelled.
How often is DL 4099 from RNO to LAX late?
Delta Air Lines 4099 from Reno, NV to Los Angeles, CA arrived 15 or more minutes late, was diverted or was cancelled on 8% of 365 scheduled flights between September 2025 and August 2026. 0.5% were cancelled.
Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check Delta Air Lines for today's flight. Method.