Home / Routes / KSEA → KDEN9,891 scheduled
SEA DEN2h 41m

The route from Seattle Tacoma International Airport (KSEA) in Seattle to Denver International Airport (KDEN) in Denver. SkyMeter tracks roughly 9,891 scheduled flights on this route across 23 carriers. The most active operator is UAL (UAL). Average block time is 2h 10m. Departures average 30 minutes off schedule, with 52% running more than 15 minutes late. The most common aircraft on this route is the BOEING Boeing 737-800.

Scheduled
9,891
last 543 days
ADS-B observed
1,281
Airlines
23
Avg dep delay
30m
Late >15 min
52.4%
Cancel rate
0.59%

Airlines on this route

14 carriers · scheduled

United Airlines
UAL · UA · 2,807 flights · avg 25m delay · 38.7% late
15 cancelled
Alaska Airlines
ASA · AS · 2,293 flights · avg 31m delay · 60.7% late
10 cancelled
Southwest Airlines Co
SWA · WN · 2,046 flights · avg 34m delay · 61.3% late
20 cancelled
Delta Air Lines
DAL · DL · 1,555 flights · avg 31m delay · 50.9% late
8 cancelled
Frontier Airlines
FFT · F9 · 651 flights · avg 31m delay · 50.5% late
5 cancelled
Air Transport International
ATN · 8C · 515 flights · avg 31m delay · 63.3% late
Concesionaria Vuela Compania De Aviacion S.a. De C.v
VOI · Y4 · 12 flights · avg 10m delay · 0.0% late
Mn Airlines D/B/A Sun Country Airlines
SCX · SY · 3 flights · avg 23m delay · 33.3% late
Cobalt Air
CNS · CNS · 2 flights · avg 36m delay · 50.0% late
· ATI · 2 flights · avg 0m delay · 0.0% late
American Airlines
AAL · AA · 2 flights · avg -1m delay · 0.0% late
· TTT · 1 flights · avg 0m delay · 0.0% late
Atlas Air
GTI · 5Y · 1 flights · avg —m delay · 0.0% late
Lgm Enterprises
JRE · 1 flights · avg 34m delay · 100.0% late

Recent observed flights

From ADS-B trace data

ASA602N464ASB739
2026-10-26 20:09  →  2026-10-26 22:52  ·  2h 42m
Replay
ASA535N703ALB39M
2026-10-26 17:05  →  2026-10-26 19:49  ·  2h 43m
Replay
UAL757N14544A21N
2026-10-26 12:00  →  2026-10-26 14:44  ·  2h 44m
Replay
ATN3397N313AZB763
2026-10-25 23:10  →  2026-10-26 02:15  ·  3h 5m
Replay
SWA1860N8899HB38M
2026-10-25 21:50  →  2026-10-26 00:29  ·  2h 38m
Replay
DAL2543N326DUBCS3
2026-10-25 20:56  →  2026-10-25 23:36  ·  2h 39m
Replay
ASA602N402ASB739
2026-10-25 20:09  →  2026-10-25 22:54  ·  2h 44m
Replay
UAL1534N67845B739
2026-10-25 19:32  →  2026-10-25 22:28  ·  2h 56m
Replay
ASA535N734ALB39M
2026-10-25 17:15  →  2026-10-25 20:01  ·  2h 45m
Replay
DAL1358N340DUBCS3
2026-10-25 15:33  →  2026-10-25 18:52  ·  3h 19m
Replay

Codeshare partnerships

Marketing carriers selling tickets on this route under their own flight numbers

sells ASA 1522
sells ASA 1341
sells ASA 689
sells ASA 659
sells DAL 623
sells DAL 475
sells DAL 469
sells ASA 402
sells DAL 398
sells FFT 396
sells ASA 359
sells ASA 359
sells DAL 318
sells UAL 306
sells ASA 305
sells UAL 296
sells DAL 166
sells ASA 106
sells ASA 69
sells UAL 63

Typical aircraft

Observed via ADS-B on this route

BOEING Boeing 737-800
B738
17%
of flights
AIRBUS Airbus A321 Neo
A21N
16%
of flights
BOEING Boeing 737-900
B739
15%
of flights
BOEING Boeing 737 MAX 8
B38M
13%
of flights
AIRBUS-BOMBARDIER Airbus A220-300
BCS3
12%
of flights
BOEING Boeing 737 MAX 9
B39M
10%
of flights
BOEING Boeing 737-700
B737
6%
of flights
BOEING Boeing 767-300
B763
5%
of flights

Looking for the return flight?

View KDEN → KSEA