Denver (DEN) to Seattle (SEA)
Flight time
≈ 2h 51m
Bearing
307° NW
Denver (DEN) to Seattle (SEA) is 1,022 miles (1,645 km) as the crow flies — the great-circle baseline most distance-based mileage programs credit.
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What actually flies DEN–SEA
US DOT T-100 · filed dataIn April 2026, United Airlines operated the most departures, one of 6 carriers flying nonstop DEN–SEA; the Boeing 737-800 was the most common aircraft at 24% of departures; flights ran 86% full.
Departures
940
April 2026
Seats
151,814
both directions
Passengers
130,644
both directions
Load factor
86.1%
passengers ÷ seats
Who flies DEN–SEA?
United Airlines operated the most nonstop DEN–SEA departures in April 2026 (276), one of 6 carriers on the route.
- UA
United Airlines
276 departures · 46,338 seats
Share of departures29.4%87.6%
Load
- AS
Alaska Airlines
227 departures · 39,585 seats
Share of departures24.1%84.9%
Load
- WN
Southwest Airlines
186 departures · 31,790 seats
Share of departures19.8%91.0%
Load
- DL
Delta Air Lines
98 departures · 12,637 seats
Share of departures10.4%72.5%
Load
- OO
SkyWest Airlines
85 departures · 6,424 seats
Share of departures9.0%86.1%
Load
- F9
Frontier Airlines
68 departures · 15,040 seats
Share of departures7.2%85.4%
Load
What plane flies DEN–SEA?
In April 2026, the Boeing 737-800 flew 24% of DEN–SEA departures — more than any other aircraft type.
- Boeing 737-800
224 departures · 89.1% load
23.8% - Boeing 737 MAX 8
193 departures · 87.9% load
20.5% - Boeing 737-900ER
124 departures · 86.8% load
13.2% - Boeing 737 MAX 9
110 departures · 84.3% load
11.7% - Airbus A220-300
95 departures · 72.6% load
10.1% - Embraer E175
85 departures · 86.1% load
9.0% - Airbus A321neo
38 departures · 84.5% load
4.0% - Airbus A321
20 departures · 84.6% load
2.1% - Boeing 737-700
20 departures · 92.1% load
2.1% - Airbus A320neo
14 departures · 89.4% load
1.5% - Airbus A319
8 departures · 86.2% load
0.9% - Airbus A320
6 departures · 94.0% load
0.6% - Airbus A220-100
2 departures · 57.8% load
0.2% - Boeing 757-200
1 departures · 95.8% load
0.1%
How has DEN–SEA traffic changed?
Nonstop DEN–SEA departures fell from 1,120 in May 2025 to 940 in April 2026.
Monthly nonstop DEN–SEA traffic, trailing 12 months through April 2026. Bars scale to the busiest month; months with no filed service show as zero.
May 2025
1,120 departures · 165,479 passengers
88.2%
Load
June 2025
1,272 departures · 186,304 passengers
87.9%
Load
July 2025
1,313 departures · 204,979 passengers
92.3%
Load
August 2025
1,275 departures · 202,035 passengers
92.1%
Load
September 2025
1,149 departures · 171,901 passengers
88.2%
Load
October 2025
1,104 departures · 159,436 passengers
85.6%
Load
November 2025
912 departures · 125,010 passengers
83.3%
Load
December 2025
929 departures · 131,752 passengers
87.0%
Load
January 2026
864 departures · 112,844 passengers
84.0%
Load
February 2026
808 departures · 106,434 passengers
83.7%
Load
March 2026
891 departures · 123,455 passengers
89.0%
Load
April 2026
940 departures · 130,644 passengers
86.1%
Load
By direction
The DOT files each direction separately — they rarely match.
SEA → DEN
86.7% full
471 departures · 66,230 passengers
DEN → SEA
85.4% full
469 departures · 64,414 passengers
Nonstop DEN–SEA traffic has been filed with the US DOT since 2025.
Source: US DOT BTS Form 41 T-100 Segment (All Carriers). Data through April 2026; filings from 2025. Public domain (US Government work). The DOT publishes roughly three months in arrears.
The airports
Frequently asked
How far is Denver (DEN) from Seattle (SEA)?
DEN to SEA is 1,022 miles (1,645 km / 888 nautical miles) measured great-circle — the shortest path over the surface of the Earth.
How long is the flight from DEN to SEA?
A nonstop covers the 1,022-mile great-circle distance in roughly 2h 51m of block time, before winds. Actual schedules vary a few percent by direction and aircraft.
What plane flies DEN–SEA?
In April 2026, the Boeing 737-800 flew the largest share of departures (23.8%), followed by the Boeing 737 MAX 8 (20.5%).
What mileage do I earn flying DEN–SEA?
Distance-based programs credit off the 1,022-mile great-circle figure, then apply your fare-class earning rate. Revenue-based programs credit off the fare instead.
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