From the existing guide library. Pricing, loan examples and source dates may be historical. Use current written quotes for your purchase. The worksheets use the shared calculation method.

The True Operating Cost of King Air C90

The Beechcraft King Air C90 is the world's most successful twin-engine turboprop offering nine-seat capacity, exceptional payload, and unmatched capability. Plan for $235,000–$295,000 annually in operating costs at 100 flight hours, or $2,350–$2,950 per hour. The King Air C90 dominates utility and corporate markets with proven performance.

Quick Specs: King Air C90

Specification C90
Engines 2 × Pratt & Whitney PT6A-20 (550 shp each)
Fuel Burn 180–210 gal/hr cruise
Cruise Speed 250–300 mph
Service Ceiling 35,000 ft
Useful Load 4,100–4,800 lbs
Seats 9
Range 1,800–2,200 nm

TL;DR: King Air C90 Annual Operating Cost Summary

  • Fixed costs: $65,000–$85,000/year (insurance $18,000–$25,000, hangar $28,000–$36,000, annuals $14,000–$18,000, crew)
  • Variable costs at 100 hours: $170,000–$210,000/year (Jet-A fuel, oils, engine reserves)
  • Total at 100 hours: $235,000–$295,000/year (~$2,350–$2,950/hour)
  • Finance a $3,200,000 C90: Add $47,000/month ($564,000/year) at 6.5% over 12 years
  • At 50 hours: ~$157,500–$202,500/year (~$3,150–$4,050/hour)
  • At 200 hours: ~$340,000–$420,000/year (~$1,700–$2,100/hour)

Twin Turboprop Utility Operating Costs

Fixed Costs

  • Insurance: $18,000–$25,000/year for $3,500,000–$4,500,000 hull
  • Hangar: $28,000–$36,000/year (twin turboprop facility)
  • Annual inspection: $14,000–$18,000 labor (twin-engine complexity)
  • Crew training/proficiency: $4,000–$6,000/year

Variable Costs (per flight hour)

  • Jet-A fuel: 195 gal/hr × $5.50/gal = ~$1,072/hour
  • Oil and lubricants: $15–$22/hour
  • Engine reserves: $32–$40/hour ($62.5K per engine ÷ 3,500 TBO × 2)
  • Twin-engine maintenance: $50–$75/hour
  • Avionics/systems: $85–$125/hour
  • Landing fees: $150–$400/landing

Jet Fuel & Operating Economics

Fuel Cost by Hours

Annual Hours Gallons Jet-A Cost @ $5.50/gal $/Hour
50 9,750 $53,625 $1,072
100 19,500 $107,250 $1,072
150 29,250 $160,875 $1,072
200 39,000 $214,500 $1,072

Maintenance & Engine Reserves

Pratt & Whitney PT6A-20 Engines

  • PT6A-20: 3,500 hours TBO
  • Overhaul cost: $62,000–$78,000 per engine
  • Combined reserve: $140,000 ÷ 3,500 = $40/hour
  • Reliability: Proven turboprop with excellent support

Twin Turboprop Maintenance

  • Engine system checks: $4,000–$6,000/year
  • Hydraulic system: $3,000–$4,500/year
  • Pressurization systems: $2,000–$3,000/year
  • Environmental systems: $2,000–$3,000/year
  • Budget: $190–$260/hour for all maintenance

Insurance & Storage

Twin Turboprop Insurance

  • $3,500,000 hull: $18,000–$22,000/year
  • $4,500,000 hull: $24,000–$30,000/year
  • Utility operations: +30–50% premium

Storage Costs

Option Monthly Annual
Twin Turboprop Hangar $2,300–$3,000 $27,600–$36,000
Tie-Down $600–$1,000 $7,200–$12,000

Annual Ownership Scenarios

Operating Cost (Not Financed)

Hours/Year Fixed Variable Total $/Hour
50 $75,000 $92,000 $167,000 $3,340
100 $75,000 $184,000 $259,000 $2,590
200 $75,000 $368,000 $443,000 $2,215

Total Cost of Ownership (With Financing)

Assume $3,200,000 King Air C90, 6.5% APR, 12 years = $564,000/year debt service.

Hours/Year Operating Finance Total $/Hour
100 $259,000 $564,000 $823,000 $8,230
200 $443,000 $564,000 $1,007,000 $5,035

Financing the King Air C90

  • Purchase price: $2,500,000–$4,200,000
  • Down payment: 15–20%
  • Loan amount: $2,100,000–$3,600,000
  • Term: 12–15 years
  • APR: 5.75–7.0% (2025)
  • Monthly payment: $38,000–$72,000

Lender Requirements: 650+ credit, twin turboprop experience, $500,000+ annual revenue, business plan, hull insurance $3.5M+. Lenders like JakenAviation support utility aircraft financing.

King Air C90 vs. Competitors

  • vs. PC-12: C90 twin-engine; PC-12 single-engine. C90 larger
  • vs. Cessna 414: C90 turboprop; 414 piston. C90 more efficient

Get prequalified for utility aircraft financing »

Sources: Beechcraft Aircraft Specs | AOPA Owner Reports | FAA TCDS

Operating-cost worksheet

Defaults are round assumptions, not a shop quote. AOPA’s worksheet splits fixed costs (insurance, hangar, the annual), direct costs (fuel and maintenance), and a reserve (overhaul cost divided by hours to TBO). Their old teaching example used half the hourly fuel bill as a maintenance starting point. Type your own gph and prices.

Stop dividing one year’s costs by too few hours

The expensive mistake on a King Air C90 is to take insurance, hangar, and an annual, divide by 80 or 100 hours, and call the result the cost of flying. Those bills arrive if you fly or not. AOPA’s operating-cost worksheet treats them as fixed costs, then adds direct costs that do move with hours: fuel, oil, and maintenance. A reserve for the engine or propeller is a third bucket, optional in their sheet and not optional in real life if you intend to keep the aircraft through an overhaul. The worksheet on this page follows that split. Any annual dollar range printed higher up on this page, if it does not cite an invoice or AOPA, is an illustration. Do not repeat it as a quote.

Fuel is a multiplication, not a rumor

AOPA’s instruction is price per gallon times gallons per hour. The gallons per hour belong to the way you actually fly the King Air C90, not to the brochure cruise at the most flattering altitude. Oil is the same idea: price per quart times quarts per hour. Type both into the worksheet. If you do not know burn, leave a conservative guess and replace it after five tanks of your own notes. A blog’s “cost per hour” that hides the burn and the fuel price is not usable, because you cannot tell which assumption broke.

The maintenance starting point AOPA actually published

For a first pass, AOPA equates routine engine and airframe maintenance, on an hourly basis, to about half the hourly fuel and oil bill, and says to adjust it once you have your own invoices. The checkbox on the worksheet does that and nothing fancier. Turn it off and type a maintenance figure when you have one. A separate AOPA line for avionics is 5 percent of the avionics’ replacement value per 500 hours. That is a starting point from their sheet, not a prediction that your King Air C90 panel will fail on schedule. Unsupported radios cost more than that formula, because the fix is often a replacement, not a repair.

The overhaul reserve is a division

AOPA’s method is the shop’s overhaul or remanufacture price divided by hours left until the published TBO, not divided by the full TBO if the engine is already mid-time. Their sheet walks through a Cessna 172 example: $17,000 over 2,000 hours is $8.50 an hour, while a $27,000 reman with 900 hours left is $30 an hour. Those dollars are the example in the article, and they are not a 2026 quote for a King Air C90. The arithmetic is what you copy. Propeller overhaul, in the same AOPA sheet, is penciled at about $0.25 an hour for a fixed-pitch prop and about $1 an hour for a constant-speed prop, with more for a three-blade. Treat those as historical placeholders and ask a prop shop.

Sources