Historical on-time performance
St. Louis to Washington
719 miData through Dec 2025Source: US DOT · BTS
Flights on STL–DCA arrive on time 68% of the time over the last 12 months.
On-time rate68%arrived within 15 min
p90 delay60 min1 in 10 flights is worse (tail risk)
Cancelled3.2%of scheduled flights
based on 2,168 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Republic AirwaysbestOn-time79%Medianon timep9035 minCancel3.3%Flights120
- American AirlinesOn-time67%Medianon timep9065 minCancel1.9%Flights257
- Southwest AirlinesOn-time68%Medianon timep9060 minCancel2.0%Flights1,399
- PSA AirlinesOn-time68%Medianon timep9065 minCancel8.2%Flights392
Why flights run late
Delay causes
- Airline26%
- Weather3%
- Air traffic (NAS)30%
- Late aircraft41%
- 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 STL → DCA
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 — 87% on time.
- Mornings87% on time · p90 15 min · 2,776 flights
- Middays75% on time · p90 35 min · 1,285 flights
- Afternoons71% on time · p90 45 min · 1,206 flights
- Overnights67% on time · p90 45 min · 243 flights
- Evenings62% on time · p90 80 min · 1,500 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 71% to 82% on time.
- Saturdays82% on time · p90 30 min · 673 flights
- Tuesdays79% on time · p90 35 min · 1,091 flights
- Wednesdays78% on time · p90 35 min · 1,092 flights
- Mondays74% on time · p90 40 min · 1,092 flights
- Thursdays74% on time · p90 45 min · 1,071 flights
- Fridays74% on time · p90 40 min · 1,079 flights
- Sundays71% on time · p90 50 min · 912 flights
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