ON TIMEBOARD
IAD Washington / MOB Mobile

IAD → MOB on time

Washington Dulles (Washington, DC) to Mobile (Mobile, AL). Every scheduled flight, September 2025 to August 2026.

On time
75%
arrived < 15 min late
Cancelled
0.9%
452 flights
Typical arrival
−10 min
median vs schedule
When late
+192 min
average delay
Flights / day
1
1 airline

75% of flights from Washington to Mobile arrived on time over the past 12 months. That is worse than the typical U.S. route. 14% of flights arrived more than an hour late or not at all.

How late?

The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for IAD → MOB: when a flight was late, it was under 45 minutes late 39% of the time. About 1 in 8 flights landed an hour or more late, and 1 in 20 three hours or more; 0.9% were cancelled outright.

Share of all 452 scheduled flights, past 12 months, by arrival time against schedule.

By airline

AirlineFlightsOn timeCancelledTypical arrival1h+ lateAvg when lateOperated by
United Airlines45275%0.9%−10 min12.2%+192 minCommutAir

Airline = the name on the ticket. Regional flights (e.g. "Delta Connection") count under the ticketing airline, and the operator is listed.

Best time of day to fly

On-time rate by scheduled departure hour (local time at IAD). Delays build through the day as late planes knock on, so early flights usually do best.

40%70%100%8 a.m. departures: too few flights (39 flights)8a9 a.m. departures: too few flights (48 flights)9a10 a.m. departures: too few flights10a11 a.m. departures: too few flights11anoon departures: too few flights12p1 p.m. departures: too few flights1p2 p.m. departures: too few flights2p3 p.m. departures: too few flights3p4 p.m. departures: too few flights4p5 p.m. departures: too few flights (92 flights)5p6 p.m. departures: 71% on time (273 flights)716p
IAD → MOB, share of flights arriving on time, by departure hour. Hours with under 100 flights are greyed out.
82%+ on time76–82%68–76%under 68%too few flights

By month

Each calendar month pooled over 2023–2026. Best: October (87%). Worst: December (60%).

40%70%100%Jan: too few flights (98 flights)JanFeb: too few flights (84 flights)FebMar: too few flights (93 flights)MarApr: too few flights (90 flights)AprMay: too few flights (93 flights)MayJun: too few flights (99 flights)JunJul: 64% on time (154 flights)64JulAug: 69% on time (155 flights)69AugSep: 80% on time (118 flights)80SepOct: 87% on time (111 flights)87OctNov: 87% on time (110 flights)87NovDec: 60% on time (108 flights)60Dec

By day of week

DayFlightsOn timeCancelled
Monday69——
Tuesday59——
Wednesday59——
Thursday69——
Friday68——
Saturday60——
Sunday68——

Why flights were late

Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.

Late inbound plane 48%Airline (crew, maintenance, ops) 43%Severe weather 5%Air traffic & airport (NAS) 4%

Cancellations: weather 4

Month by month

Not enough months with data to draw a trend.

Flight numbers on this route

Regular flights with at least 120 scheduled trips in the past year. Sorted by departure time.

FlightDepartsFlightsOn timeCancelledTypical arrivalOperated by
UA 42956:45 p.m.36573%1.1%−10 minCommutAir

Questions

How often are flights from IAD to MOB on time?

75% of 452 scheduled flights from Washington, DC to Mobile, AL arrived within 15 minutes of schedule between September 2025 and August 2026. 0.9% were cancelled.

What month has the most delays from IAD to MOB?

December (60% on time). The best month is October (87%), over 2023–2026.

Related

Domestic flights by the airlines that report to the U.S. DOT, plus their regional partners. "On time" means arriving less than 15 minutes after schedule; cancelled and diverted flights count as not on time. Past performance is a guide, not a forecast. Method.