Historical on-time performance
Washington to Nashville
542 miData through Dec 2025Source: US DOT · BTS
Flights on IAD–BNA arrive on time 78% of the time over the last 12 months.
On-time rate78%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled0.3%of scheduled flights
based on 934 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesOn-time78%Medianon timep9045 minCancel0.3%Flights934
Why flights run late
Delay causes
- Airline25%
- Weather5%
- Air traffic (NAS)34%
- Late aircraft36%
- Security0%
Most delay minutes here are attributed to Late aircraft.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly IAD → BNA
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
Mornings are the most reliable time of day to fly this route — 91% on time.
- Mornings91% on time · p90 10 min · 1,040 flights
- Middays85% on time · p90 25 min · 746 flights
- Evenings71% on time · p90 60 min · 1,065 flights
- Afternoons66% on time · p90 60 min · 133 flights · limited
- Overnights55% on time · p90 120 min · 76 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 76% to 83% on time.
- Wednesdays83% on time · p90 30 min · 396 flights
- Mondays83% on time · p90 25 min · 417 flights
- Saturdays82% on time · p90 35 min · 426 flights
- Fridays82% on time · p90 35 min · 409 flights
- Tuesdays80% on time · p90 40 min · 429 flights
- Thursdays77% on time · p90 45 min · 499 flights
- Sundays76% on time · p90 55 min · 484 flights
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