About 1 in 4 DL 831 flights from Seattle arrived 15+ minutes late, diverted or cancelled over the past year (23%); 1.7% were cancelled. The typical flight landed 7 minutes early.
DL 831: SEA → AUS
Scheduled to leave Seattle at 11:35 a.m. local time. Over the past year it arrived on time 77% of the time (353 flights), better than other DL flights on the route at that hour (72%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 53 | 72% |
| Tuesday | 52 | 92% |
| Wednesday | 52 | 87% |
| Thursday | 52 | 79% |
| Friday | 52 | 65% |
| Saturday | 40 | 75% |
| Sunday | 52 | 71% |
Why it was late
All flights SEA → AUS · Connecting off DL 831? Check the risk
DL 831: AUS → SEA
Scheduled to leave Austin at 4:55 p.m. local time. Over the past year it arrived on time 72% of the time (231 flights), in line with other DL flights on the route at that hour (70%). Last seen in the data Aug 31, 2026.
Usually Delta Air Lines's last flight of the day from Austin to Seattle (83% of days). Delta Air Lines's last AUS–SEA flight was cancelled 0.6% of the time, against 0.9% for its earlier ones. If it's cancelled, the next Delta Air Lines flight is usually around 6:00 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 35 | 77% |
| Tuesday | 34 | 79% |
| Wednesday | 34 | 74% |
| Thursday | 34 | 53% |
| Friday | 34 | 71% |
| Saturday | 26 | 85% |
| Sunday | 34 | 71% |
Why it was late
All flights AUS → SEA · Connecting off DL 831? Check the risk
Questions
How often is DL 831 from SEA to AUS late?
Delta Air Lines 831 from Seattle, WA to Austin, TX arrived 15 or more minutes late, was diverted or was cancelled on 23% of 353 scheduled flights between September 2025 and August 2026. 1.7% were cancelled.
How often is DL 831 from AUS to SEA late?
Delta Air Lines 831 from Austin, TX to Seattle, WA arrived 15 or more minutes late, was diverted or was cancelled on 28% of 231 scheduled flights between September 2025 and August 2026. 1.7% 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.