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Flight Reliability

F9 687 · Frontier Airlines

Washington → Denver (DCA–DEN)

91
Nerd Approved
WanderNerd Reliability Score
87%
Arrive within 15 minutes
7 min early
Average arrival delay
0.9%
Cancelled
14 min early
Median arrival delay

Based on 318 historical flights. Data through May 2026.

What the data says

Tuesdays have been rough.

F9 687 arrived on time 98% of the time on Saturdays and just 77% on Tuesdays. That gap is worth planning around.

Better than the DCA–DEN route average.

F9 687 arrived on time 87% of the time, versus 79% across the DCA–DEN route.

Better than the Frontier Airlines network average.

F9 687 arrived on time 87% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon92%(51 flights)
  • Tue77%(31 flights)
  • Wed79%(33 flights)
  • Thu83%(48 flights)
  • Fri84%(51 flights)
  • Sat98%(50 flights)
  • Sun86%(51 flights)
On-time trend by month
70%
May

Jun 91% → May 70% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202591%23
July 202584%25
August 202596%27
September 2025100%24
October 2025100%27
November 202588%25
December 202576%29
January 202682%28
February 202686%28
March 202685%27
April 202684%25
May 202670%27
Departures on time
89%
Diverted
0%
Flights flown
315
Months covered
12

Same route, other flights

Keep nerding

Based on 318 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.