OnTimeStats

Historical on-time performance

Baltimore to Greenville

426 miData through Dec 2025Source: US DOT · BTS

Flights on BWI–GSP arrive on time 78% of the time over the last 12 months.

On-time rate78%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled0.6%of scheduled flights

based on 691 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Southwest Airlines
    On-time78%
    Medianon time
    p9050 min
    Cancel0.6%
    Flights691

Why flights run late

Delay causes

  • Airline32%
  • Weather5%
  • Air traffic (NAS)15%
  • Late aircraft47%
  • Security1%

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 BWI → GSP

All airlines · rolling 36 months (2023-01 .. 2025-12).

Best time of day

On-time rates are fairly even by time of day on this route — ranging from 56% to 89% on time.

  • Mornings89% on time · p90 15 min · 638 flights
  • Middays87% on time · p90 15 min · 106 flights · limited
  • Evenings70% on time · p90 65 min · 328 flights
  • Afternoons70% on time · p90 40 min · 358 flights
  • Overnights56% on time · p90 115 min · 221 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 72% to 81% on time.

  • Tuesdays81% on time · p90 25 min · 232 flights
  • Wednesdays78% on time · p90 40 min · 231 flights
  • Thursdays78% on time · p90 45 min · 233 flights
  • Saturdays77% on time · p90 60 min · 228 flights
  • Sundays76% on time · p90 40 min · 257 flights
  • Mondays75% on time · p90 40 min · 236 flights
  • Fridays72% on time · p90 50 min · 234 flights
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Methodology

A flight is on time when it arrives within 15 minutes of schedule — the US DOT / BTS standard. Median and p90(the “1-in-10 bad day”) are read from the full arrival-delay distribution, never averaged across periods.

Figures cover a carrier’s own BTS-coded flights. Cells below ~200 flights are flagged as limited data. All numbers are pre-computed from public BTS On-Time Performance data.