Beechcraft King Air 90 vs Cessna 425 Conquest I

Side-by-side specs, range, and operating costs.

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Dimensions & configuration

Representative planforms, drawn to shared scale.

Beechcraft King Air 90
50.2 × 35.5 ft 14.2 ft tall
2× Turboprop Retractable Pressurized
Cessna 425 Conquest I
44.2 × 35.8 ft 12.6 ft tall
2× Turboprop Retractable Pressurized

Flight Profile

Service ceiling, range, and climb rate.

Tap legend to isolate

Arc represents the climb-cruise-descent profile based on published service ceiling and range. Climb rate annotated on ascent. FL180 (18,000 ft) shown for reference.

Mission Performance

Stall, approach, cruise, range, ceiling and climb: best values are at the top.

Mission performance specifications
Specification Beechcraft King Air 90Cessna 425 Conquest I
Stall speed 88 kt84 kt
Approach speed 100 kt91 kt
Cruise speed 245 kt260 kt
Range 1468 nm1339 nm
Service ceiling 27620 ft33400 ft
Rate of climb 1870 fpm2000 fpm
Fuel burn 78.0 gph68.0 gph

Each axis is scaled independently across the compared aircraft and printed in its own units; every vertex sits at the published figure. Higher is better on all axes: Stall, Approach and Fuel Burn are inverted (lower = higher). A missing figure breaks the line at that axis.

Fuel Burn & Range

Range, endurance, and what the fuel costs by the hour.

Beechcraft King Air 90 Jet A
78.0 gph
Baseline
1,468 nm range 3.1 nm/gal 474 gal usable $468 fuel/hr 6h 04m endurance
Beechcraft King Air 90: 78.0 gallons per hour at cruise, 1,468 nautical mile published range, 6 hour 4 minute endurance, 3.1 nautical miles per gallon.
Cessna 425 Conquest I Jet A
68.0 gph
Baseline
1,339 nm range 3.8 nm/gal 366 gal usable $408 fuel/hr 5h 22m endurance
Cessna 425 Conquest I: 68.0 gallons per hour at cruise, 1,339 nautical mile published range, 5 hour 22 minute endurance, 3.8 nautical miles per gallon.
Jet A range each cell = 1 hr of cruise · width scales with speed

Bars show published still-air range. Endurance is usable fuel divided by the published cruise burn. Estimates only. Always verify against the POH.

Runway Performance

Density altitude adjusted estimates

Outside Air Temp
0°F57°F115°F
Field Elevation
SL4,0008,000 ft
Density Altitude

Takeoff over 50 ft obstacle

Landing ground roll

Base distance DA penalty
Scale: 6,000 ft

FAA 10%/1,000 ft DA rule of thumb (FAA-H-8083-25B). Turboprops and jets are less sensitive in practice. Always verify against the POH.

Estimated Operating Costs

Scale:
Beechcraft King Air 90 Jet A
$1,329 /hr
Baseline
Beechcraft King Air 90: $1,329 per flight hour — fuel $468, maintenance and reserve $861.
Cessna 425 Conquest I Jet A
$1,045 /hr
Baseline
Cessna 425 Conquest I: $1,045 per flight hour — fuel $408, maintenance and reserve $637.
Beechcraft King Air 90 Turboprop
$23,249 /yr Baseline
Beechcraft King Air 90: $23,249 per year — insurance withheld, hangar $10,981, annual inspection $12,268.
Cessna 425 Conquest I Turboprop
$28,000 /yr Baseline
Cessna 425 Conquest I: $28,000 per year — insurance $16,500, hangar $9,000, annual inspection $2,500.

Estimates only. Costs vary by location, pilot profile, and market conditions. See individual aircraft pages for source notes.

Capability & limits

Each bar stacks your selected occupants against full fuel and the aircraft's useful-load limit (the black line). The open gap between them is spare payload. Add an occupant and the gap closes; once it's gone, fuel has to give.

lb

+ lb / pax

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Beechcraft King Air 90
10 / 10 seats 474 / 474 gal fuel 384 lb wet payload 3,560 lb useful 10,100 lb MTOW
Cessna 425 Conquest I
8 / 8 seats 366 / 366 gal fuel 821 lb wet payload 3,273 lb useful 8,600 lb MTOW

Occupants at 190 + 30 lb each. Fuel at 6.7 lb/gal jet-A, 6.0 lb/gal avgas.

Payload-Range Map

Origin: · two fingers to move map

lb

+ lb / pax

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