Airport · ALS · Alamosa, Colorado

Alamosa, CO

Alamosa, CO posts top-5% on-time performance among the 382 tracked U.S. airports, as a smaller regional airport. According to the U.S. DOT Bureau of Transportation Statistics, drawn from 1,982 flights (2020–2025); its biggest delay driver is carrier.

Compiled by PlainFlights Editorial, Flight Performance Editorial Team

Data updated 2026-06-13

89%
On-time: Top 5%
on-time, US airports: 166 min
Delay when late: 2.02%
Cancelled

Key Performance Metrics

Total Flights

1,982

Best Month

Sep 99%

Worst Month

Jul 91.5%

Delayed

219

Cancelled

60-65%

1
65-70%

4
70-75%

9
75-80%

48
80-85%

192
85-90%

116
90-95%

12

What this shows ALS is marked in the 85-90% band.

Delay Cause Breakdown

Top delay cause: Carrier. Total delay minutes: 18,636.

Late Aircraft 25.3% (4,724 min)

Carrier 65.1% (12,132 min)

NAS (National Aviation System) 1.9% (351 min)

Weather 7.7% (1,429 min)

Security 0.0% (0 min)

Seasonal Performance Patterns

Monthly averages across all years of data. Best month: September (99% on-time). Most delays: July (91.5% on-time).

Month	Avg Flights	Avg Delayed	Avg Cancelled	On-Time %
December	107	13	3	93%
November	103	9	1	94.1%
October	106	9	1	97.2%
September	104	4	0	99%
August	106	9	2	98.1%
July	106	24	0	91.5%
June	63	11	0	95.2%
May	105	11	1	96.2%
April	102	9	1	95.1%
March	99	16	3	93.4%
February	97	12	3	94.3%
January	105	8	8	96.2%

Year-Over-Year Performance

Annual flight volume and on-time trends at ALS.

Year	Flights	Delayed	Cancelled	On-Time %
2022	521	21	23	96%
2021	1,252	62	13	95%
2020	209	15	4	92.8%

Cancellation & Diversion Analysis

Flight disruption statistics for Alamosa, CO.

Cancellation Rate

2.02%

40 of 1,982 flights

Diversion Rate

0.05%

1 of 1,982 flights

Delay Rate

11.0%

219 of 1,982 flights

Monthly Performance

Recent 24 months of flight data.

Period	Flights	Dep Delayed	Arr Delayed	Cancelled	Diverted
Jun 2022	24	0	2	0	0
May 2022	104	6	7	2	0
Apr 2022	100	2	3	1	0
Mar 2022	92	6	12	0	0
Feb 2022	97	5	8	6	0
Jan 2022	104	2	4	14	0
Dec 2021	108	7	8	4	0
Nov 2021	102	5	1	0	0
Oct 2021	106	3	6	1	0
Sep 2021	104	1	3	0	0
Aug 2021	106	2	7	2	0
Jul 2021	106	9	15	0	0
Jun 2021	102	6	14	0	0
May 2021	106	2	6	0	0
Apr 2021	104	8	4	0	1
Mar 2021	106	7	6	5	0
Feb 2021	96	6	4	0	0
Jan 2021	106	6	4	1	0
Dec 2020	106	8	3	2	0
Nov 2020	103	7	4	2	0

Top Routes from ALS

Busiest routes to and from Alamosa, CO.

Route	Flights	On-Time	Distance
ALS (Alamosa) → DEN (Denver)	979	90.6%	179 mi
DEN (Denver) → ALS (Alamosa)	979	87.8%	179 mi

Airports With a Similar On-Time Rate

Other U.S. airports nationwide whose on-time rate is closest to Alamosa, CO's 89%.

Hibbing, MN

89% on-time 7,678 flights

Brainerd, MN

88.9% on-time 7,762 flights

Deadhorse, AK

89.1% on-time 5,986 flights

Del Rio, TX

88.9% on-time 3,957 flights

Helena, MT

89.2% on-time 17,569 flights

Walla Walla, WA

88.8% on-time 4,519 flights

Other Airports in Colorado

Compare performance with other Colorado airports.

DEN 78.9%

Denver, CO

Denver · 3,293,040 flights

COS 80.4%

Colorado Springs, CO

Colorado Springs · 134,711 flights

ASE 73.5%

Aspen, CO

Aspen · 78,805 flights

GJT 85.1%

Grand Junction, CO

Grand Junction · 47,063 flights

DRO 83.4%

Durango, CO

Durango · 42,722 flights

EGE 78%

Eagle, CO

Eagle · 37,271 flights

MTJ 81.3%

Montrose/Delta, CO

Montrose/Delta · 32,233 flights

HDN 79.7%

Hayden, CO

Hayden · 27,069 flights

Keep exploring

More flight data around Alamosa, CO.

Colorado flight data

Statewide on-time and delay aggregates, plus every reporting airport in Colorado.

View CO data →

Airport rankings

See where ALS sits among U.S. airports on on-time rate and average delay.

Best on-time airports →

Compare airports

Put ALS head-to-head with another airport on delays and reliability.

Open comparison tool →

What the Data Says About ALS

Alamosa, CO in Alamosa, Colorado handled 1,982 flights in the Bureau of Transportation Statistics dataset between 2020 and 2022, posting a 89% on-time departure rate. Of those flights, 219 experienced delays, 40 were cancelled, and 1 were diverted. The cancellation rate works out to 2.02%, the diversion rate to 0.05%, and the average delay when departures run late is 166.1 minutes. These figures are the baseline for comparing ALS against other airports in the same state and nationally.

Breaking down what drives delays at ALS, Carrier leads the pack. Carrier accounts for 65.1% of total delay minutes, followed by Late Aircraft at 25.3% and Weather at 7.7%. Weather contributes 7.7% of delay minutes at this airport, while security holds the smallest share at 0.0%. Travelers often overestimate the weather share; the BTS categorization shows late-arriving aircraft and carrier operations as the larger contributors.

Seasonally, September runs the cleanest at ALS with a 99% on-time rate, while July is the roughest at 91.5% - a 8-point swing between best and worst month. Volume peaks in December, when average flights hit 107. The busiest route connecting ALS is to DEN (Denver), with 979 flights at a 90.6% on-time rate. Combine these numbers - 89% on-time, 166.1-minute average delay, 2.02% cancellation rate, and you have a concrete picture of departure reliability at Alamosa, CO.

Frequently Asked Questions

What is the on-time performance rate at Alamosa, CO (ALS)? ▼

Alamosa, CO has an overall on-time departure rate of 89%. Out of 1,982 total flights tracked, 219 experienced delays and 40 were cancelled.

What is the most common cause of delays at ALS? ▼

The top delay cause at Alamosa, CO is Carrier. Carrier accounts for 65.1% of all delay minutes.

What is the average delay time at ALS? ▼

The average delay at Alamosa, CO is 166.1 minutes. This includes delays from carrier issues, weather, National Aviation System constraints, security, and late-arriving aircraft.

What is the best month to fly from ALS? ▼

Based on historical data, September has the best on-time performance at ALS with 99% of flights departing on time.

What is the worst month for delays at ALS? ▼

July tends to have the most delays at ALS, with an on-time rate of only 91.5%.

How many routes operate from ALS? ▼

Alamosa, CO serves at least 2 routes. The busiest route is ALS to DEN (Alamosa - Denver) with 979 flights.

What is the cancellation rate at ALS? ▼

Alamosa, CO has a cancellation rate of 2.02%, based on 40 cancelled flights out of 1,982 total flights tracked.

Flight Guides

Data-driven guides to help you understand airport and flight performance.

Best & Worst Airlines for On-Time Performance

Which carriers consistently outperform peers

Why Flights Get Cancelled

Cancellation causes broken down by data

How to Choose Reliable Flight Routes

Use delay data to pick flights that arrive on time

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Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data (2020–2022). Statistics reflect cumulative performance across all available reporting periods. On-time rates exclude cancelled and diverted flights.

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

Using ALS's data

An airport-level on-time rate is a starting point, not a guarantee for your specific flight.

Check the busiest route from ALS before you book a connection. See top routes
Travel in September rather than July if your dates are flexible. Seasonal patterns
Scores vary by airline and route within the same airport; check the specific carrier you're flying. Browse airlines

On-time rate reflects the BTS historical average across all reporting carriers at this airport, not any single flight or airline.

All airports → | Rankings →

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 Editorial

Source: U.S. Bureau of Transportation Statistics (BTS) Airline on-time performance and operational reliability · 2025 Accessed 2026-07-23

Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. Airport figures are computed directly from BTS On-Time Performance data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.