Ontario (ONT) to Santa Rosa (STS)
Flight time
≈ 1h 39m
Bearing
318° NW
Ontario (ONT) to Santa Rosa (STS) is 423 miles (681 km) as the crow flies — the great-circle baseline most distance-based mileage programs credit.
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What actually flies ONT–STS
Filed traffic dataIn May 2026, Horizon Air operated the most departures, one of 2 carriers flying nonstop ONT–STS; the Embraer E175 was the most common aircraft at 100% of departures; flights ran 54% full.
Departures
62
May 2026
Seats
4,712
both directions
Passengers
2,565
both directions
Load factor
54.4%
RPM ÷ ASM
Who flies ONT–STS?
Horizon Air operated the most nonstop ONT–STS departures in May 2026 (38), one of 2 carriers on the route.
- QX
38 departures · 2,888 seats
Share of departures61.3%55.2%
Load
- OO
24 departures · 1,824 seats
Share of departures38.7%53.2%
Load
What plane flies ONT–STS?
In May 2026, the Embraer E175 flew 100% of ONT–STS departures.
- Embraer E175
62 departures · 54.4% load
100.0%
How has ONT–STS traffic changed?
Nonstop ONT–STS departures rose from 2 in December 2025 to 62 in May 2026.
Monthly nonstop ONT–STS traffic, trailing 12 months through May 2026. Bars scale to the busiest month; months with no filed service show as zero.
December 2025
2 departures · 0 passengers
0.0%
Load
January 2026
0 departures · 0 passengers
—
Load
February 2026
0 departures · 0 passengers
—
Load
March 2026
28 departures · 1,347 passengers
63.3%
Load
April 2026
60 departures · 2,637 passengers
57.8%
Load
May 2026
62 departures · 2,565 passengers
54.4%
Load
By direction
Each direction is filed separately — they rarely match.
ONT → STS
56.3% full
31 departures · 1,326 passengers
STS → ONT
52.6% full
31 departures · 1,239 passengers
Nonstop ONT–STS 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 Ontario (ONT) from Santa Rosa (STS)?
ONT to STS is 423 miles (681 km / 367 nautical miles) measured great-circle — the shortest path over the surface of the Earth.
How long is the flight from ONT to STS?
A nonstop covers the 423-mile great-circle distance in roughly 1h 39m of block time, before winds. Actual schedules vary a few percent by direction and aircraft.
What plane flies ONT–STS?
In May 2026, the Embraer E175 flew the largest share of departures (100.0%).
What mileage do I earn flying ONT–STS?
Distance-based programs credit off the 423-mile great-circle figure, then apply your fare-class earning rate. Revenue-based programs credit off the fare instead.
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