ON TIMEBOARD
Delta Air Lines / SEA → DFW

DL 803 on time

Delta Air Lines 803: Seattle to Dallas at 9:15 a.m.; Dallas to Seattle at 4:15 p.m. (past 12 months). Figures below the title are for SEA → DFW, its busiest leg

On time
79%
255 flights · likely 74–84%
Cancelled
1.2%
of scheduled flights
Typical arrival
−8 min
median vs schedule
When late
+74 min
average delay
Similar flights
78%
DL, same route & hour

About 1 in 5 DL 803 flights from Seattle arrived 15+ minutes late, diverted or cancelled over the past year (21%); 1.2% were cancelled. The typical flight landed 8 minutes early.

DL 803: SEA → DFW

Scheduled to leave Seattle at 9:15 a.m. local time. Over the past year it arrived on time 79% of the time (255 flights), in line with other DL flights on the route at that hour (78%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%May 2025: 90% on time (31 flights)90MayJun 2025: too few flights (10 flights)JunJul 2025: too few flights (1 flights)JulDec 2025: too few flights (12 flights)DecJan 2026: 68% on time (31 flights)68JanFeb 2026: 89% on time (28 flights)89FebMar 2026: 84% on time (31 flights)84MarApr 2026: 87% on time (30 flights)87AprMay 2026: 84% on time (31 flights)84MayJun 2026: 77% on time (30 flights)77JunJul 2026: 71% on time (31 flights)71JulAug 2026: 84% on time (31 flights)84Aug

By day of week

DayFlightsOn time
Monday3784%
Tuesday3686%
Wednesday3672%
Thursday3686%
Friday3672%
Saturday3776%
Sunday3778%

Why it was late

Airline (crew, maintenance, ops) 55%Air traffic & airport (NAS) 23%Late inbound plane 19%Severe weather 3%

All flights SEA → DFW · Connecting off DL 803? Check the risk

DL 803: DFW → SEA

Scheduled to leave Dallas at 4:15 p.m. local time. Over the past year it arrived on time 73% of the time (190 flights), in line with other DL flights on the route at that hour (71%). Last seen in the data Jul 6, 2026.

Usually Delta Air Lines's last flight of the day from Dallas to Seattle (100% of days). Delta Air Lines's last DFW–SEA flight was cancelled 0.9% of the time, against 2.5% for its earlier ones. If it's cancelled, the next Delta Air Lines flight is usually around 6:30 a.m. the next morning.

Month by month

40%70%100%Dec 2024: 86% on time (28 flights)86DecJan 2025: too few flights (4 flights)JanMay 2025: 95% on time (20 flights)95MayJun 2025: too few flights (6 flights)JunDec 2025: too few flights (9 flights)DecJan 2026: 70% on time (30 flights)70JanFeb 2026: 75% on time (28 flights)75FebMar 2026: 65% on time (31 flights)65MarApr 2026: 73% on time (30 flights)73AprMay 2026: 83% on time (29 flights)83MayJun 2026: 71% on time (28 flights)71JunJul 2026: too few flights (5 flights)Jul

By day of week

DayFlightsOn time
Monday2868%
Tuesday2774%
Wednesday2673%
Thursday2681%
Friday2875%
Saturday2770%
Sunday2868%

Why it was late

Airline (crew, maintenance, ops) 49%Late inbound plane 32%Air traffic & airport (NAS) 13%Severe weather 7%

All flights DFW → SEA · Connecting off DL 803? Check the risk

Questions

How often is DL 803 from SEA to DFW late?

Delta Air Lines 803 from Seattle, WA to Dallas/Fort Worth, TX arrived 15 or more minutes late, was diverted or was cancelled on 21% of 255 scheduled flights between September 2025 and August 2026. 1.2% were cancelled.

How often is DL 803 from DFW to SEA late?

Delta Air Lines 803 from Dallas/Fort Worth, TX to Seattle, WA arrived 15 or more minutes late, was diverted or was cancelled on 27% of 190 scheduled flights between September 2025 and August 2026. 1.6% 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.