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
Filed traffic dataIn May 2026, United Airlines operated the most departures, one of 7 carriers flying nonstop DEN–SEA; the Boeing 737 MAX 8 was the most common aircraft at 19% of departures; flights ran 85% full.
Departures
1,093
May 2026
Seats
186,088
both directions
Passengers
158,982
both directions
Load factor
85.4%
RPM ÷ ASM
Who flies DEN–SEA?
United Airlines operated the most nonstop DEN–SEA departures in May 2026 (330), one of 7 carriers on the route.
- UA
330 departures · 57,708 seats
Share of departures30.2%85.0%
Load
- AS
300 departures · 52,281 seats
Share of departures27.4%85.9%
Load
- WN
196 departures · 33,616 seats
Share of departures17.9%90.8%
Load
- DL
174 departures · 22,555 seats
Share of departures15.9%80.2%
Load
- F9
80 departures · 18,946 seats
Share of departures7.3%82.4%
Load
- OO
12 departures · 906 seats
Share of departures1.1%84.7%
Load
- QX
1 departures · 76 seats
Share of departures0.1%65.8%
Load
What plane flies DEN–SEA?
In May 2026, the Boeing 737 MAX 8 flew 19% of DEN–SEA departures — more than any other aircraft type.
- Boeing 737 MAX 8
210 departures · 87.3% load
19.2% - Boeing 737-800
193 departures · 87.4% load
17.7% - Boeing 737-900ER
185 departures · 85.5% load
16.9% - Airbus A220-300
171 departures · 80.7% load
15.7% - Airbus A321neo
147 departures · 83.8% load
13.5% - Boeing 737 MAX 9
98 departures · 86.8% load
9.0% - Airbus A320
28 departures · 85.1% load
2.6% - Airbus A321
20 departures · 87.3% load
1.8% - Boeing 737-700
18 departures · 90.3% load
1.7% - Embraer E175
13 departures · 83.2% load
1.2% - Airbus A319
6 departures · 83.3% load
0.5% - Airbus A220-100
3 departures · 43.7% load
0.3% - Airbus A320neo
1 departures · 94.6% load
0.1%
How has DEN–SEA traffic changed?
Nonstop DEN–SEA departures fell from 1,272 in June 2025 to 1,093 in May 2026.
Monthly nonstop DEN–SEA traffic, trailing 12 months through May 2026. Bars scale to the busiest month; months with no filed service show as zero.
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
May 2026
1,093 departures · 158,982 passengers
85.4%
Load
By direction
Each direction is filed separately — they rarely match.
DEN → SEA
88.6% full
547 departures · 82,096 passengers
SEA → DEN
82.3% full
546 departures · 76,886 passengers
Nonstop DEN–SEA traffic has been filed since 2025.
Source: US DOT BTS Form 41 T-100 Segment (All Carriers). Data through May 2026; filings from 2025. Public domain (US Government work).
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 May 2026, the Boeing 737 MAX 8 flew the largest share of departures (19.2%), followed by the Boeing 737-800 (17.7%).
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.
Trip reports on YouTube
Fliers post trip reports from this route to YouTube. These three were matched automatically from public YouTube listings — The Frequent Flier does not host, review, or endorse them.
The Flip Flop Traveller
Floored! (and Grounded) · DELTA AIRLINES A220 First Class 🇺🇸 Denver to Seattle《 The US Series 》
19:53 · Apr 2025
The Trip Reporter
TRIP REPORT | Delta Air Lines (First Class) | Denver to Seattle | Airbus A220-300
22:01 · Dec 2024
MedJet Aviation
Trip Report: Southwest Airlines Seattle to Denver. SEA-DEN
8:07 · Jan 2026
Source: YouTube. Titles, thumbnails, and channel names come from YouTube. Playing a video loads the YouTube player, and using it means you agree to the YouTube Terms of Service; the Google Privacy Policy applies.
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