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Flight Reliability

UA 757 · United Airlines

Seattle → Denver (SEA–DEN)83% of its flights flew this route. The rest (SFO–SEA, DEN–SAT) are included in these numbers.

86
Pretty Reliable
WanderNerd Reliability Score
83%
Arrive within 15 minutes
3 min
Average arrival delay
0.7%
Cancelled
7 min early
Median arrival delay

Based on 439 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

UA 757 departing between 3–6 PM arrived on time 85% of the time, versus 77% between 6–9 PM.

Friday is doing you no favors.

UA 757 arrived on time 93% of the time on Saturdays and just 72% on Fridays. That gap is worth planning around.

A bit ahead of the SEA–DEN route.

UA 757 arrived on time 83% of the time, versus 78% across the SEA–DEN route.

A bit ahead of the United Airlines network.

UA 757 arrived on time 83% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon88%(65 flights)
  • Tue86%(59 flights)
  • Wed88%(59 flights)
  • Thu73%(64 flights)
  • Fri72%(65 flights)
  • Sat93%(55 flights)
  • Sun85%(66 flights)
On-time by departure window
  • 6–9 AM—(1 flights)
  • 9 AM–12 PM83%(29 flights)
  • 12–3 PM83%(94 flights)
  • 3–6 PM85%(243 flights)
  • 6–9 PM77%(66 flights)
On-time trend by month
81%
May

Jun 79% → May 81% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202579%34
July 202560%47
August 202577%30
September 202580%35
October 202589%52
November 2025100%30
December 202588%32
January 2026100%31
February 202679%28
March 202685%53
April 202693%30
May 202681%31
Departures on time
83%
Diverted
0.7%
Flights flown
433
Months covered
12

Same route, other flights

Keep nerding

Based on 439 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.