About 1 in 4 DL 870 flights from Seattle arrived 15+ minutes late, diverted or cancelled over the past year (28%); 2.3% were cancelled. The typical flight landed 4 minutes early.
DL 870: SEA → DFW
Scheduled to leave Seattle at 5:55 p.m. local time. Over the past year it arrived on time 72% of the time (356 flights), in line with other DL flights on the route at that hour (72%). Last seen in the data Aug 31, 2026.
Usually Delta Air Lines's last flight of the day from Seattle to Dallas (100% of days). Delta Air Lines's last SEA–DFW flight was cancelled 2.3% of the time, against 0.9% for its earlier ones. If it's cancelled, the next Delta Air Lines flight is usually around 9:15 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 52 | 63% |
| Tuesday | 51 | 76% |
| Wednesday | 50 | 84% |
| Thursday | 50 | 78% |
| Friday | 52 | 69% |
| Saturday | 50 | 74% |
| Sunday | 51 | 59% |
Why it was late
All flights SEA → DFW · Connecting off DL 870? Check the risk
Questions
How often is DL 870 from SEA to DFW late?
Delta Air Lines 870 from Seattle, WA to Dallas/Fort Worth, TX arrived 15 or more minutes late, was diverted or was cancelled on 28% of 356 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.