Denver to Seattle Flights DEN → SEA

Denver International Airport → Seattle–Tacoma International Airport

🇺🇸 Denver, US → 🇺🇸 Seattle, US

The Denver to Seattle route connects Denver International Airport (DEN) in US with Seattle–Tacoma International Airport (SEA) in US. This medium-haul flight covers approximately 1023 miles (1646 km) with a typical flight time of 2h 25m. This route is served by 8 airlines: Southwest, Alaska Airlines, Delta Air Lines and others. AirportRoutes has tracked 20 daily flights on this route.

Departure Airport

Denver International Airport

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

Destination Airport

Seattle–Tacoma International Airport

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

Operators

Daily Flights

1023

Miles

2h 25m

Flight Duration

Route Map

Operating Airlines

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

Flight Schedule Pattern

Day	Flights Observed	Frequency
Monday	13	13%
Tuesday	16	16%
Wednesday	14	14%
Thursday	17	17%
Friday	8	8%
Saturday	19	19%
Sunday	13	13%

Pattern Analysis

20 Daily Flights:

ASA643 SWA2919 DAL1731 SKW3696 SWA2628 ASA785 UAL2271 UAL1865 ATN3381 ASA535 SWA356 SWA1601 SWA1603 ASA154 ASA615 FFT2746 FFT2852 FFT4545 VOI2746 VOI2852

Data Points: 100
API observations used to build this analysis

Weekdays: 68 flights
Weekend: 32 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`	ATN3381	B763	00:29 12:29 AM (Representative)	M T W T F S S	Jan 12, 2026	Active
Alaska Airlines `ASA` / `AS`	ASA643 ASA785 UAL2271 ASA154 ASA615	B739	17:09 5:09 PM (Representative)	M T W T F S S	Feb 7, 2026	Active
Delta Air Lines `DAL` / `DL`	DAL1731	BCS3	06:29 6:29 AM (Representative)	M T W T F S S	Feb 4, 2026	Active
Frontier `FFT` / `F9`	FFT2746 FFT2852 FFT4545	A20N	10:16 10:16 AM (Representative)	M T W T F S S	Dec 24, 2025	Active
SkyWest `SKW` / `OO`	SKW3696	E75L	18:50 6:50 PM (Representative)	M T W T F S S	Feb 15, 2026	Active
Southwest `SWA` / `WN`	SWA2919 SWA2628 ASA535 SWA356 SWA1601 SWA1603	B738	19:00 7:00 PM (Representative)	M T W T F S S	Feb 8, 2026	Active
United `UAL` / `UA`	UAL1865	B738	19:08 7:08 PM (Representative)	M T W T F S S	Feb 4, 2026	Active
Volaris `VOI` / `Y4`	VOI2746 VOI2852	A320	10:16 10:16 AM (Representative)	M T W T F S S	Dec 24, 2025	Active

Total Routes: 8

Active Routes: 8

Unique Airlines: 8

Aircraft Types: 8

Spotted Departure Times

Departure Time	Operator	ICAO	IATA
00:29 12:29 AM	Air Transport International, Inc.	`ATN`	`8C`
06:29 6:29 AM	Delta Air Lines	`DAL`	`DL`
10:16 10:16 AM	Frontier	`FFT`	`F9`
10:16 10:16 AM	Volaris	`VOI`	`Y4`
17:09 5:09 PM	Alaska Airlines	`ASA`	`AS`
18:50 6:50 PM	SkyWest	`SKW`	`OO`
19:00 7:00 PM	Southwest	`SWA`	`WN`
19:08 7:08 PM	United	`UAL`	`UA`

Time Information

Times are shown in the departure airport's local timezone (UTC).

Total Departure Times: 8

Time Range:
00:29 - 19:08

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