ON TIMEBOARD
IAD Washington / SBN South Bend

IAD → SBN on time

Washington Dulles (Washington, DC) to South Bend (South Bend, IN). Every scheduled flight, September 2025 to August 2026.

On time
81%
arrived < 15 min late
Cancelled
2.1%
384 flights
Typical arrival
−13 min
median vs schedule
When late
+100 min
average delay
Flights / day
1
1 airline

81% of flights from Washington to South Bend arrived on time over the past 12 months. That is about the typical U.S. route. 11% 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 → SBN: when a flight was late, it was under 45 minutes late 33% of the time. About 1 in 12 flights landed an hour or more late, and 1 in 55 three hours or more; 2.1% were cancelled outright.

Share of all 384 scheduled flights, past 12 months, by arrival time against schedule.

By airline

AirlineFlightsOn timeCancelledTypical arrival1h+ lateAvg when lateOperated by
United Airlines38481%2.1%−13 min8.3%+100 minMesa Airlines 78%, Republic Airways 22%, United Airlines 0%

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%5 p.m. departures: too few flights (89 flights)5p6 p.m. departures: 82% on time (245 flights)826p7 p.m. departures: too few flights (31 flights)7p
IAD → SBN, 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.

40%70%100%Jan: too few flights (62 flights)JanFeb: too few flights (56 flights)FebMar: too few flights (62 flights)MarApr: too few flights (60 flights)AprMay: too few flights (62 flights)MayJun: too few flights (60 flights)JunJul: too few flights (62 flights)JulAug: too few flights (80 flights)AugSep: too few flights (30 flights)SepOct: too few flights (32 flights)OctNov: too few flights (30 flights)NovDec: too few flights (60 flights)Dec

By day of week

DayFlightsOn timeCancelled
Monday56——
Tuesday52——
Wednesday55——
Thursday55——
Friday55——
Saturday55——
Sunday56——

Why flights were late

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

Late inbound plane 43%Airline (crew, maintenance, ops) 25%Air traffic & airport (NAS) 19%Severe weather 13%

Cancellations: weather 4 · air traffic/airport 3 · airline 1

Month by month

Not enough months with data to draw a trend.

Questions

How often are flights from IAD to SBN on time?

81% of 384 scheduled flights from Washington, DC to South Bend, IN arrived within 15 minutes of schedule between September 2025 and August 2026. 2.1% were cancelled.

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.