Seattle (SEA) to Santa Rosa (STS)
Flight time
≈ 2h 02m
Bearing
183° S
Seattle (SEA) to Santa Rosa (STS) is 618 miles (995 km) as the crow flies — the great-circle baseline most distance-based mileage programs credit.
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What actually flies SEA–STS
US DOT T-100 · filed dataIn April 2026, Alaska Airlines operated the most departures, one of 2 carriers flying nonstop SEA–STS; the Embraer E175 was the most common aircraft at 47% of departures; flights ran 72% full.
Departures
114
April 2026
Seats
13,740
both directions
Passengers
9,932
both directions
Load factor
72.3%
passengers ÷ seats
Who flies SEA–STS?
Alaska Airlines operated the most nonstop SEA–STS departures in April 2026 (60), one of 2 carriers on the route.
- AS
Alaska Airlines
60 departures · 9,636 seats
Share of departures52.6%69.7%
Load
- QX
Horizon Air
54 departures · 4,104 seats
Share of departures47.4%78.4%
Load
What plane flies SEA–STS?
In April 2026, the Embraer E175 flew 47% of SEA–STS departures — more than any other aircraft type.
- Embraer E175
54 departures · 78.4% load
47.4% - Boeing 737-800
46 departures · 70.3% load
40.4% - Boeing 737 MAX 8
14 departures · 67.6% load
12.3%
How has SEA–STS traffic changed?
Nonstop SEA–STS departures rose from 112 in May 2025 to 114 in April 2026.
Monthly nonstop SEA–STS traffic, trailing 12 months through April 2026. Bars scale to the busiest month; months with no filed service show as zero.
May 2025
112 departures · 9,513 passengers
76.3%
Load
June 2025
118 departures · 10,598 passengers
78.0%
Load
July 2025
121 departures · 11,554 passengers
82.0%
Load
August 2025
122 departures · 12,902 passengers
79.5%
Load
September 2025
119 departures · 13,669 passengers
72.2%
Load
October 2025
124 departures · 11,565 passengers
77.1%
Load
November 2025
117 departures · 9,784 passengers
70.4%
Load
December 2025
101 departures · 9,221 passengers
74.0%
Load
January 2026
91 departures · 5,985 passengers
62.8%
Load
February 2026
101 departures · 6,048 passengers
70.3%
Load
March 2026
120 departures · 8,471 passengers
73.8%
Load
April 2026
114 departures · 9,932 passengers
72.3%
Load
By direction
The DOT files each direction separately — they rarely match.
SEA → STS
74.5% full
57 departures · 5,116 passengers
STS → SEA
70.1% full
57 departures · 4,816 passengers
Nonstop SEA–STS 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 Seattle (SEA) from Santa Rosa (STS)?
SEA to STS is 618 miles (995 km / 537 nautical miles) measured great-circle — the shortest path over the surface of the Earth.
How long is the flight from SEA to STS?
A nonstop covers the 618-mile great-circle distance in roughly 2h 02m of block time, before winds. Actual schedules vary a few percent by direction and aircraft.
What plane flies SEA–STS?
In April 2026, the Embraer E175 flew the largest share of departures (47.4%), followed by the Boeing 737-800 (40.4%).
What mileage do I earn flying SEA–STS?
Distance-based programs credit off the 618-mile great-circle figure, then apply your fare-class earning rate. Revenue-based programs credit off the fare instead.
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