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Route · ALS → DEN · 2020–2025 BTS data

Alamosa to Denver

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), ALS to DEN (Alamosa to Denver) ranks #4523 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

90.6%
On-time
+11.6 pts
vs US avg
207 min
Delay when late
979
Flights
#4523 of 4927
Corpus placement

Cancelled

4.1%

Best Month

Aug 2021 98%

Worst Month

Dec 2020 79%

Distance

179 mi

Carriers

1

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
May 2022 52 3 2 0 OO
Apr 2022 50 2 1 0 OO
Mar 2022 46 2 0 0 OO
Feb 2022 49 6 6 0 OO
Jan 2022 52 2 14 0 OO
Dec 2021 54 6 4 0 OO
Nov 2021 51 3 0 0 OO
Oct 2021 53 3 1 0 OO
Sep 2021 52 1 0 0 OO
Aug 2021 53 1 2 0 OO
Jul 2021 53 8 0 0 OO
Jun 2021 51 9 0 0 OO
May 2021 53 2 0 0 OO
Apr 2021 52 8 0 1 OO
Mar 2021 53 6 5 0 OO
Feb 2021 48 6 0 0 OO
Jan 2021 53 8 1 0 OO
Dec 2020 53 11 2 0 OO
Nov 2020 51 5 2 0 OO

ALS–DEN seasonal on-time pattern

Best: August (98.1%) · weakest: June (82.4%)

80%85%90%95%100% JanFebMarAprMayJunJulAugSepOctNovDec 84.1%

Strongest calendar month

August

98.1% on-time · ~53 flights/mo

Busiest calendar month

December

~54 flights/mo avg

Weakest calendar month

June

82.4% on-time · ~51 flights/mo

Cancellation Rate

4.1%

40 of 979 flights

Diversion Rate

0.1%

1 of 979 flights

Explore origin & destination

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

ALS - Alamosa

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

ALS on-time profile

DEN - Denver

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

DEN on-time profile

Compare the two airports

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

Compare ALS vs DEN

What the Data Says About ALS to DEN

Alamosa to Denver (ALS to DEN) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 90.6% on-time rate across 979 flights, with delays that do happen averaging 207.0 minutes. The corridor runs roughly 179 miles and is served by 1 carrier. Over the most recent 24 months, 40 of 979 flights were cancelled (4.1%) and 1 diverted (0.1%).

The monthly split is wide on this route: Aug 2021 posted the strongest performance at 98% on-time, while Dec 2020 came in at just 79% - a 19-point swing worth factoring into travel timing.

On the multi-year calendar, ALS–DEN peaks in August at 98.1% on-time while December carries the heaviest traffic (~54 flights per month) ; the softest month is June at 82.4%, a 15.7-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does ALS to DEN rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, ALS to DEN ranks #4523 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 ALS to DEN? ▼
Flights from Alamosa to Denver have a 90.6% on-time rate based on 979 flights. The average delay is 207.0 minutes. The best recent month was Aug 2021 with 98% on-time.
What is the cancellation rate for ALS to DEN? ▼
Over the last 24 months, 4.1% of flights on this route were cancelled (40 of 979 flights) and 0.1% were diverted.
How far is the flight from ALS to DEN? ▼
The flight distance from Alamosa (ALS) to Denver (DEN) is approximately 179 miles. This route is served by 1 carrier.
When is the best time to fly from ALS to DEN? ▼
The best recent month for on-time performance was Aug 2021 (98% on-time). The worst was Dec 2020 (79% on-time). Consider booking during months with historically better performance.

Airports on this route

ALS Airport

Alamosa
DEN Airport

Denver
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 ALS–DEN data

ALS–DEN runs 11.6 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare ALS and DEN airport profiles: delay causes and top routes differ even on the same corridor. ALS airport
  • If your dates flex, August (98.1% on-time) beats June (82.4%) on this corridor. Seasonal chart
  • 4 other routes post a similar 90.6% 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.