About 1 in 5 DL 506 flights from Seattle arrived 15+ minutes late, diverted or cancelled over the past year (21%); 1.4% were cancelled. The typical flight landed 8 minutes early.
DL 506: SEA → MIA
Scheduled to leave Seattle at 8:00 a.m. local time. Over the past year it arrived on time 79% of the time (365 flights), in line with other DL flights on the route at that hour (76%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 53 | 72% |
| Tuesday | 52 | 81% |
| Wednesday | 52 | 83% |
| Thursday | 52 | 81% |
| Friday | 52 | 75% |
| Saturday | 52 | 81% |
| Sunday | 52 | 81% |
Why it was late
All flights SEA → MIA · Connecting off DL 506? Check the risk
DL 506: MIA → SEA
Scheduled to leave Miami at 6:05 p.m. local time. Over the past year it arrived on time 60% of the time (257 flights), worse than other DL flights on the route at that hour (63%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 36 | 47% |
| Tuesday | 36 | 81% |
| Wednesday | 36 | 64% |
| Thursday | 38 | 58% |
| Friday | 38 | 55% |
| Saturday | 37 | 65% |
| Sunday | 36 | 47% |
Why it was late
All flights MIA → SEA · Connecting off DL 506? Check the risk
Questions
How often is DL 506 from SEA to MIA late?
Delta Air Lines 506 from Seattle, WA to Miami, FL arrived 15 or more minutes late, was diverted or was cancelled on 21% of 365 scheduled flights between September 2025 and August 2026. 1.4% were cancelled.
How often is DL 506 from MIA to SEA late?
Delta Air Lines 506 from Miami, FL to Seattle, WA arrived 15 or more minutes late, was diverted or was cancelled on 40% of 257 scheduled flights between September 2025 and August 2026. 2.3% 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.