Seattle to Denver Flights SEA → DEN

Seattle–Tacoma International Airport → Denver International Airport

🇺🇸 Seattle, US → 🇺🇸 Denver, US

The Seattle to Denver route connects Seattle–Tacoma International Airport (SEA) in US with Denver International Airport (DEN) in US. This medium-haul flight covers approximately 1023 miles (1646 km) with a typical flight time of 2h 15m. This route is served by 8 airlines: United, Southwest, Alaska Airlines and others. AirportRoutes has tracked 11 daily flights on this route.

Departure Airport

Seattle–Tacoma International Airport

ICAO Code:: KSEA
IATA Code:: SEA
City:: 🇺🇸 Seattle
Country:: US
Elevation:: 433 ft

Destination Airport

Denver International Airport

ICAO Code:: KDEN
IATA Code:: DEN
City:: 🇺🇸 Denver
Country:: US
Elevation:: 5431 ft

Operators

Daily Flights

1023

Miles

2h 15m

Flight Duration

Route Map

Great Circle

Map data © Mapbox © OpenStreetMap contributors

Operating Airlines

Airline	ICAO	IATA
United	`UAL`	`UA`
Southwest	`SWA`	`WN`
Alaska Airlines	`ASA`	`AS`
Delta Air Lines	`DAL`	`DL`
Frontier	`FFT`	`F9`
Volaris	`VOI`	`Y4`
Atlas Air	`GTI`	`5Y`
Air Transport International, Inc.	`ATN`	`8C`

Flight Schedule Pattern

Day	Flights Observed	Frequency
Monday	30	14%
Tuesday	25	12%
Wednesday	32	15%
Thursday	32	15%
Friday	35	16%
Saturday	36	17%
Sunday	25	12%

Pattern Analysis

11 Daily Flights:

UAL397 SWA3485 ASA602 UAL2269 SWA2141 UAL1263 UAL1479 SWA734 SWA1567 FFT2648 VOI2648

Data Points: 215
API observations used to build this analysis

Weekdays: 154 flights
Weekend: 61 flights

Business Route More active on weekdays

All Flight Routes

8 Routes

Note: This table shows aggregated route data by airline. Each airline may operate multiple daily flights at different times. See the "Spotted Departure Times" section below for all observed departure times.

Airline	Flight Numbers	Aircraft Type	Typical Time	Days Active	Last Seen	Status
Air Transport International, Inc. `ATN` / `8C`	-	B763	-	M T W T F S S	Sep 11, 2025	Active
Alaska Airlines `ASA` / `AS`	ASA602	B739	19:54 7:54 PM (Representative)	M T W T F S S	Jan 29, 2026	Active
Atlas Air `GTI` / `5Y`	-	B744	11:32 11:32 AM (Representative)	M T W T F S S	Nov 26, 2025	Active
Delta Air Lines `DAL` / `DL`	-	B738	-	M T W T F S S	Oct 28, 2025	Active
Frontier `FFT` / `F9`	FFT2648	A321	13:25 1:25 PM (Representative)	M T W T F S S	Dec 25, 2025	Active
Southwest `SWA` / `WN`	SWA3485 SWA2141 SWA734 SWA1567	B38M	06:05 6:05 AM (Representative)	M T W T F S S	Feb 2, 2026	Active
United `UAL` / `UA`	UAL397 UAL2269 UAL1263 UAL1479	B39M	05:00 5:00 AM (Representative)	M T W T F S S	Feb 2, 2026	Active
Volaris `VOI` / `Y4`	VOI2648	A321	13:25 1:25 PM (Representative)	M T W T F S S	Dec 25, 2025	Active

Total Routes: 8

Active Routes: 8

Unique Airlines: 8

Aircraft Types: 9

Spotted Departure Times

Departure Time	Operator	ICAO	IATA
05:00 5:00 AM	United	`UAL`	`UA`
06:05 6:05 AM	Southwest	`SWA`	`WN`
11:32 11:32 AM	Atlas Air	`GTI`	`5Y`
13:25 1:25 PM	Frontier	`FFT`	`F9`
13:25 1:25 PM	Volaris	`VOI`	`Y4`
19:54 7:54 PM	Alaska Airlines	`ASA`	`AS`

Time Information

Times are shown in the departure airport's local timezone (KSEA - America/Los_Angeles).

Total Departure Times: 6

Time Range:
05:00 - 19:54

These are typical departure times observed from actual flights. Times may vary by season and schedule changes.