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Delta Air Lines / SEA → DCA

DL 786 on time

Delta Air Lines 786: Seattle to Washington at 7:20 a.m.; Washington to Seattle at 4:40 p.m. (past 12 months). Figures below the title are for SEA → DCA, its busiest leg

On time
89%
328 flights · likely 85–92%
Cancelled
2.1%
of scheduled flights
Typical arrival
−10 min
median vs schedule
When late
+119 min
average delay
Similar flights
89%
DL, same route & hour

About 1 in 9 DL 786 flights from Seattle arrived 15+ minutes late, diverted or cancelled over the past year (11%); 2.1% were cancelled. The typical flight landed 10 minutes early.

DL 786: SEA → DCA

Scheduled to leave Seattle at 7:20 a.m. local time. Over the past year it arrived on time 89% of the time (328 flights), in line with other DL flights on the route at that hour (89%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Sep 2025: 70% on time (30 flights)70SepOct 2025: 94% on time (31 flights)94OctNov 2025: 90% on time (30 flights)90NovDec 2025: 84% on time (31 flights)84DecJan 2026: 87% on time (31 flights)87JanFeb 2026: 96% on time (28 flights)96FebMar 2026: too few flights (7 flights)MarApr 2026: 89% on time (18 flights)89AprMay 2026: 97% on time (31 flights)97MayJun 2026: 93% on time (30 flights)93JunJul 2026: 83% on time (30 flights)83JulAug 2026: 94% on time (31 flights)94Aug

By day of week

DayFlightsOn time
Monday4888%
Tuesday4791%
Wednesday4794%
Thursday4777%
Friday4794%
Saturday4696%
Sunday4685%

Why it was late

Airline (crew, maintenance, ops) 85%Air traffic & airport (NAS) 9%Late inbound plane 4%Security 2%

All flights SEA → DCA · Connecting off DL 786? Check the risk

DL 786: DCA → SEA

Scheduled to leave Washington at 4:40 p.m. local time. Over the past year it arrived on time 63% of the time (152 flights), in line with other DL flights on the route at that hour (65%). Last seen in the data Aug 31, 2026.

Month by month

20%60%100%Apr 2025: 94% on time (17 flights)94AprMay 2025: 84% on time (31 flights)84MayJun 2025: 73% on time (30 flights)73JunJul 2025: 52% on time (31 flights)52JulAug 2025: too few flights (5 flights)AugMar 2026: 33% on time (24 flights)33MarApr 2026: too few flights (12 flights)AprMay 2026: 68% on time (25 flights)68MayJun 2026: 70% on time (30 flights)70JunJul 2026: 70% on time (30 flights)70JulAug 2026: 71% on time (31 flights)71Aug

By day of week

DayFlightsOn time
Monday2250%
Tuesday2157%
Wednesday2157%
Thursday2259%
Friday2264%
Saturday2176%
Sunday2378%

Why it was late

Air traffic & airport (NAS) 49%Airline (crew, maintenance, ops) 33%Late inbound plane 12%Severe weather 6%

All flights DCA → SEA · Connecting off DL 786? Check the risk

Questions

How often is DL 786 from SEA to DCA late?

Delta Air Lines 786 from Seattle, WA to Washington, DC arrived 15 or more minutes late, was diverted or was cancelled on 11% of 328 scheduled flights between September 2025 and August 2026. 2.1% were cancelled.

How often is DL 786 from DCA to SEA late?

Delta Air Lines 786 from Washington, DC to Seattle, WA arrived 15 or more minutes late, was diverted or was cancelled on 37% of 152 scheduled flights between September 2025 and August 2026. 4.0% 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.