Historical on-time performance
Washington to Nashville
542 miData through May 2026Source: US DOT · BTS
Flights on IAD–BNA arrive on time 82% of the time over the last 12 months.
On-time rate82%arrived within 15 min
p90 delay30 min1 in 10 flights is worse (tail risk)
Cancelled0.7%of scheduled flights
based on 960 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesOn-time82%Medianon timep9030 minCancel0.7%Flights960
Why flights run late
Delay causes
- Airline27%
- Weather5%
- Air traffic (NAS)28%
- Late aircraft40%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline43%
- Weather57%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 7 cancellations with a reported cause (BTS reports causes from June 2003).
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 (2023-06 .. 2026-05).
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 · 982 flights
- Middays86% on time · p90 20 min · 706 flights
- Evenings71% on time · p90 60 min · 1,057 flights
- Afternoons64% on time · p90 75 min · 109 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 76% to 83% on time.
- Saturdays83% on time · p90 30 min · 395 flights
- Wednesdays83% on time · p90 30 min · 384 flights
- Fridays82% on time · p90 30 min · 400 flights
- Mondays82% on time · p90 25 min · 401 flights
- Tuesdays80% on time · p90 45 min · 398 flights
- Thursdays80% on time · p90 40 min · 475 flights
- Sundays76% on time · p90 50 min · 462 flights
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