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Route · DEN → BUF · 2020–2025 BTS data

Denver to Buffalo

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), DEN to BUF (Denver to Buffalo) ranks #3743 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

65%
On-time
-14 pts
vs US avg
61 min
Delay when late
2,129
Flights
#3743 of 4927
Corpus placement

Cancelled

1.5%

Best Month

Oct 2025 84%

Worst Month

Jul 2025 47%

Distance

1,359 mi

Carriers

6

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Nov 2025 52 11 0 0 UA,WN
Oct 2025 70 11 0 0 UA,WN,F9
Sep 2025 77 28 0 0 UA,WN,F9
Aug 2025 81 39 0 1 WN,F9,UA
Jul 2025 83 44 1 0 UA,WN,F9
Jun 2025 79 39 0 0 UA,WN,F9
May 2025 44 29 0 0 UA,WN,F9
Apr 2025 30 19 0 0 WN
Oct 2024 39 7 0 0 WN,F9
Sep 2024 44 6 0 0 WN,F9
Aug 2024 54 17 0 0 F9,WN
Jul 2024 48 17 1 0 F9,WN
Jun 2024 45 20 0 0 F9,WN
May 2024 46 22 0 0 F9,WN
Apr 2024 39 23 0 0 F9,WN
Dec 2023 31 14 0 0 WN
Nov 2023 30 10 0 0 WN
Oct 2023 31 17 0 0 WN
Sep 2023 32 20 0 0 F9,WN
Aug 2023 47 22 0 0 F9,WN
Jul 2023 37 13 0 1 F9,WN
Dec 2022 45 6 12 1 WN,F9
Nov 2022 48 5 4 0 F9,WN
Oct 2022 57 16 0 0 WN,F9

DEN–BUF seasonal on-time pattern

Best: November (78.6%) · weakest: March (36.7%)

30%40%50%60%70%80%90% JanMarAprMayJunJulAugSepOctNovDec 75.5%

Strongest calendar month

November

78.6% on-time · ~39 flights/mo

Busiest calendar month

August

~56 flights/mo avg

Weakest calendar month

March

36.7% on-time · ~30 flights/mo

Cancellation Rate

1.5%

18 of 1,189 flights

Diversion Rate

0.3%

3 of 1,189 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

DEN - Denver

Full on-time, delay-cause, and seasonal performance for Denver, CO.

DEN on-time profile

BUF - Buffalo

Full on-time, delay-cause, and seasonal performance for Buffalo, NY.

BUF on-time profile

Compare the two airports

See DEN and BUF side by side on delays, cancellations, and reliability.

Compare DEN vs BUF

Origin-hub reliability standing

Softer reliability from DEN

Among 168 routes leaving DEN, only 27 (including this one) clear below 75% on-time, while 8 stay ≥85% and 133 sit mid-band. Travelers comparing DEN options should weigh this 65% print against those peers · fleet on-time rank #4894 of 4927.

What the Data Says About DEN to BUF

On-time performance on the DEN to BUF pairing (Denver to Buffalo) trails a chunk of the network: 65% of 2,129 tracked flights arrived on schedule, with a 60.9-minute average delay on the ones that ran late. The route spans about 1,359 miles across 6 carriers. Cancellations over the trailing 24 months hit 1.5% (18 of 1,189 flights), with 0.3% diverted.

The monthly split is wide on this route: Oct 2025 posted the strongest performance at 84% on-time, while Jul 2025 came in at just 47% - a 37-point swing worth factoring into travel timing.

On the multi-year calendar, DEN–BUF peaks in November at 78.6% on-time while August carries the heaviest traffic (~56 flights per month) ; the softest month is March at 36.7%, a 41.9-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does DEN to BUF rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, DEN to BUF ranks #3743 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from DEN to BUF? ▼
Flights from Denver to Buffalo have a 65% on-time rate based on 2,129 flights. The average delay is 60.9 minutes. The best recent month was Oct 2025 with 84% on-time.
What is the cancellation rate for DEN to BUF? ▼
Over the last 24 months, 1.5% of flights on this route were cancelled (18 of 1,189 flights) and 0.3% were diverted.
How far is the flight from DEN to BUF? ▼
The flight distance from Denver (DEN) to Buffalo (BUF) is approximately 1,359 miles. This route is served by 6 carriers.
When is the best time to fly from DEN to BUF? ▼
The best recent month for on-time performance was Oct 2025 (84% on-time). The worst was Jul 2025 (47% on-time). Consider booking during months with historically better performance.

Airports on this route

DEN Airport

Denver
BUF Airport

Buffalo
Data source

Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.

Read our methodology - how this data is sourced, computed, and verified.

Using DEN–BUF data

DEN–BUF sits 14 pts below the national 79% average; check the seasonal chart and airport profiles before treating the headline as typical.

  • Compare DEN and BUF airport profiles: delay causes and top routes differ even on the same corridor. DEN airport
  • If your dates flex, November (78.6% on-time) beats March (36.7%) on this corridor. Seasonal chart
  • 4 other routes post a similar 65% on-time rate; compare before you commit to this pairing. Similar routes

On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.