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 Beechcraft King Air 90

The Beechcraft King Air 90 is a legendary twin-turboprop offering unmatched reliability, altitude capability (25,000 ft), and proven commercial platform performance. Plan for $65,000–$78,000 annually in operating costs at 100 flight hours, or $650–$780 per hour. Higher fuel burn and maintenance reflect premium turboprop technology; however, PT6A engines offer 3,500-hour TBO and legendary durability. The King Air platform dominates regional transport, charter, and special operations worldwide.

Quick Specs: Beechcraft King Air 90

Specification King Air 90 (Current)
Engines 2 × Pratt & Whitney PT6A-20 (550 hp each)
Fuel Burn 20–24 gal/hr combined cruise
Cruise Speed 200–215 mph
Service Ceiling 25,000 ft
Useful Load 3,000–3,200 lbs
Seats 6–9
Range 1,500–2,000 nm

TL;DR: King Air 90 Annual Operating Cost Summary

  • Fixed costs: $28,000–$36,000/year (insurance $4,200–$6,000, hangar $6,600–$8,400, annuals $3,000–$4,200)
  • Variable costs at 100 hours: $37,000–$42,000/year (Jet-A fuel, oil, engine reserves)
  • Total at 100 hours: $65,000–$78,000/year (~$650–$780/hour)
  • Finance a $400,000 King Air 90: Add $6,000/month ($72,000/year) at 6.5% over 7 years
  • At 50 hours: ~$48,500–$57,000/year (~$970–$1,140/hour)
  • At 200 hours: ~$102,000–$120,000/year (~$510–$600/hour)

Turboprop Operating Costs

Fixed Costs

  • Insurance: $4,200–$6,000/year for $400,000–$500,000 hull with 500+ pilot hours
  • Hangar: $6,600–$8,400/year (turboprops require climate-controlled storage)
  • Annual inspection: $3,000–$4,200 labor (turboprop-specific systems)
  • Type rating/recurrent training: $1,500–$2,500/year

Variable Costs (per flight hour)

  • Jet-A fuel: 22 gal/hr × $5.50/gal = ~$121/hour
  • Oil and filter: $6–$8/hour (turboprops consume more oil)
  • Engine reserve: $17–$22/hour ($35K per engine ÷ 3,500 TBO × 2)
  • Prop maintenance reserve: $8–$12/hour
  • Turboprop maintenance: $40–$50/hour (fuel heaters, gearboxes, governors)
  • Landing fees: $10–$25/landing

Fuel Burn & Jet-A Costs

Fuel Cost Breakdown

Annual Hours Gallons Cost @ $5.50/gal $/Hour
50 1,100 $6,050 $121
100 2,200 $12,100 $121
150 3,300 $18,150 $121
200 4,400 $24,200 $121

Maintenance & PT6A Engine Reserves

Legendary PT6A Engines

  • Pratt & Whitney PT6A-20: 3,500 hours TBO (longest in twin-turboprop class)
  • Overhaul cost: $35,000–$42,000 per engine
  • Combined reserve: $70,000–$84,000 ÷ 3,500 = $20–$24/hour
  • Parts availability: Excellent worldwide support; proven reliability

Turboprop-Specific Maintenance

  • Fuel heater maintenance: $300–$600/year
  • Propeller governor overhauls: $1,200–$1,800 each
  • Gearbox inspections: $400–$700/year
  • Condition monitoring trending: $600–$1,000/year
  • Budget: $40–$50/hour for turboprop-specific maintenance

Insurance & Storage

Insurance Premiums

  • $400,000 hull, 500+ hours, turboprop typed: $4,500–$5,500/year
  • $450,000 hull, 100–250 hours: $5,500–$7,000/year
  • Commercial charter: +30–50% premium

Storage Costs

Option Monthly Annual
Climate-Controlled Hangar $550–$700 $6,600–$8,400
Standard Hangar $450–$550 $5,400–$6,600

Annual Ownership Scenarios

Operating Cost (Not Financed)

Hours/Year Fixed Variable Total $/Hour
50 $32,000 $16,500 $48,500 $970
100 $32,000 $33,000 $65,000 $650
200 $32,000 $66,000 $98,000 $490

Total Cost of Ownership (With Financing)

Assume $400,000 King Air 90, 6.5% APR, 7 years = $72,000/year debt service.

Hours/Year Operating Finance Total $/Hour
100 $65,000 $72,000 $137,000 $1,370
200 $98,000 $72,000 $170,000 $850

Financing the King Air 90

  • Purchase price: $350,000–$450,000 (depends on year, avionics, airframe hours)
  • Down payment: 15–20%
  • Loan amount: $300,000–$380,000
  • Term: 7–10 years
  • APR: 6.0–7.25% (2025)
  • Monthly payment: $4,800–$6,000

Lender Requirements: 650+ credit, turboprop type-rated, $200,000+ annual income, hull insurance $400K+, comprehensive appraisal. Lenders like JakenAviation favor King Airs for charter operators and commercial missions.

King Air 90 vs. Competitors

  • vs. King Air 350: 350 costs 40–50% more; faster, pressurized, larger cabin
  • vs. Cessna 425: King Air 90 more reliable; Cessna 425 cheaper to buy
  • vs. TBM 850: Single-engine TBM cheaper to operate; King Air 90 twin-engine safety

Get prequalified for turboprop aircraft financing »

Sources: Beechcraft King Air 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 90 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 90, 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 90 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 90. 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