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Route Reliability

Boston → Denver

BOS–DEN · 1,754 miles · Boston Logan International Airport to Denver International Airport

79
Usually Fine
WanderNerd Reliability Score
77%
Arrive within 15 minutes
5 min
Average arrival delay
1.2%
Cancelled
3,909
Flights in the data

Data through May 2026.

Who flies it best

Ranked by on-time arrivals. Historical results, not predictions.

  1. 1.United Airlines83%1,913 flights
  2. 2.Delta Air Lines80%415 flights
  3. 3.JetBlue Airways73%674 flights
  4. 4.Southwest Airlines67%907 flights

What the data says

Morning flights do better here.

BOS–DEN flights departing between 3–6 AM arrived on time 89% of the time, versus 54% between 6–9 PM.

Thursday is the weak spot.

BOS–DEN flights arrived on time 83% of the time on Saturdays. On Thursdays: 73%.

United Airlines has a clear lead on this route.

United Airlines arrived on time 83% of the time on this route; Southwest Airlines managed 67%.

Ticking up lately.

BOS–DEN flights arrived on time 81% of the time over the last three months in the data, compared with 76% in the three months before that.

Best historical flights

Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.

Top flights by on-time rate

More flights on this route

The breakdown

On-time by weekday
  • Mon79%(576 flights)
  • Tue79%(518 flights)
  • Wed79%(545 flights)
  • Thu73%(577 flights)
  • Fri74%(588 flights)
  • Sat83%(468 flights)
  • Sun74%(581 flights)
On-time by departure window
  • 3–6 AM89%(145 flights)
  • 6–9 AM89%(999 flights)
  • 9 AM–12 PM88%(951 flights)
  • 12–3 PM75%(238 flights)
  • 3–6 PM67%(929 flights)
  • 6–9 PM54%(591 flights)
On-time trend by month
82%
May

Jun 71% → May 82% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202571%382
July 202569%419
August 202579%391
September 202573%331
October 202577%341
November 202588%292
December 202574%298
January 202675%249
February 202679%246
March 202676%298
April 202685%284
May 202682%322

Keep nerding

Based on 3,909 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.