Billings (BIL) to Seattle (SEA)
Flight time
≈ 2h 07m
Bearing
285° W
Billings (BIL) to Seattle (SEA) is 662 miles (1,066 km) as the crow flies — the great-circle baseline most distance-based mileage programs credit.
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What actually flies BIL–SEA
Filed traffic dataIn July 2026, Horizon Air operated the most departures, one of 2 carriers flying nonstop BIL–SEA; the Embraer E175 was the most common aircraft at 100% of departures; flights ran 84% full.
Departures
213
July 2026
Seats
16,290
both directions
Passengers
13,624
both directions
Load factor
83.6%
RPM ÷ ASM
Who flies BIL–SEA?
Horizon Air operated the most nonstop BIL–SEA departures in July 2026 (212), one of 2 carriers on the route.
- QX
212 departures · 16,112 seats
Share of departures99.5%83.6%
Load
- AS
1 departures · 178 seats
Share of departures0.5%83.7%
Load
What plane flies BIL–SEA?
In July 2026, the Embraer E175 flew 100% of BIL–SEA departures — more than any other aircraft type.
- Embraer E175
212 departures · 83.6% load
99.5% - Boeing 737-900ER
1 departures · 83.7% load
0.5%
How has BIL–SEA traffic changed?
Nonstop BIL–SEA departures rose from 178 in August 2025 to 213 in July 2026.
Monthly nonstop BIL–SEA traffic, trailing 12 months through July 2026. Bars scale to the busiest month; months with no filed service show as zero.
August 2025
178 departures · 12,176 passengers
90.0%
Load
September 2025
164 departures · 10,660 passengers
85.5%
Load
October 2025
176 departures · 10,918 passengers
81.6%
Load
November 2025
159 departures · 9,772 passengers
76.5%
Load
December 2025
122 departures · 8,010 passengers
86.4%
Load
January 2026
123 departures · 7,374 passengers
78.9%
Load
February 2026
111 departures · 6,740 passengers
79.9%
Load
March 2026
116 departures · 7,373 passengers
83.6%
Load
April 2026
120 departures · 7,430 passengers
81.5%
Load
May 2026
162 departures · 10,646 passengers
86.5%
Load
June 2026
179 departures · 12,151 passengers
89.3%
Load
July 2026
213 departures · 13,624 passengers
83.6%
Load
By direction
Each direction is filed separately — they rarely match.
SEA → BIL
81.5% full
107 departures · 6,715 passengers
BIL → SEA
85.8% full
106 departures · 6,909 passengers
Nonstop BIL–SEA traffic has been filed since 2025.
Source: US DOT BTS Form 41 T-100 Segment (All Carriers). Data through July 2026; filings from 2025. Public domain (US Government work).
The airports
Frequently asked
How far is Billings (BIL) from Seattle (SEA)?
BIL to SEA is 662 miles (1,066 km / 575 nautical miles) measured great-circle — the shortest path over the surface of the Earth.
How long is the flight from BIL to SEA?
A nonstop covers the 662-mile great-circle distance in roughly 2h 07m of block time, before winds. Actual schedules vary a few percent by direction and aircraft.
What plane flies BIL–SEA?
In July 2026, the Embraer E175 flew the largest share of departures (99.5%), followed by the Boeing 737-900ER (0.5%).
What mileage do I earn flying BIL–SEA?
Distance-based programs credit off the 662-mile great-circle figure, then apply your fare-class earning rate. Revenue-based programs credit off the fare instead.
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