Cessna 421 vs Cessna Conquest I
The Cessna Conquest (turboprop twin) and 421 (pressurised piston twin) are step-up and step-down in the same cabin-class family — the Conquest brings turbine reliability and speed; the 421 is the piston-powered, lower-acquisition alternative.
Live Market Snapshot
Current asking-price market, aggregated across multiple marketplaces · refreshed daily
Cessna 421
- For sale now
- 85
- Median asking
- $410,912
- Range
- $138,945–$683,750
- Model years available
- 1968–1984
Cessna Conquest I
- For sale now
- 13
- Median asking
- $1,162,500
- Range
- $867,150–$2,135,000
- Model years available
- 1978–1985
Live data from AeroGurus, aggregated daily across the used-aircraft market. Figures are current asking prices, not appraisals — confirm with a pre-buy inspection.
Safety Record
Absolute counts scale with fleet size — the most-produced types log more events without being less safe. Compare the % fatal.
| NTSB (1982–now) | Cessna 421 | Cessna Conquest I |
|---|---|---|
| All events | 326 | — |
| Serious | 23 | — |
| Fatal | 121 | — |
| Fatalities | 342 | — |
| % Fatal | 37% | — |
Full Specs Comparison
Swipe to see all specs
| Spec / Model | Cessna 421 | Cessna Conquest I |
|---|---|---|
|
|
|
| Price Range | $138,945 – $683,750 | $867,150 – $2,135,000 |
| Category | Multi Engine Piston | Multi Engine Turboprop |
| Model Specifications | ||
| Seats | 8 | 8 |
| Horsepower | 375 HP | 450 HP |
| Cruise Speed | 230 kts (426 km/h) | 283 kts (524 km/h) |
| Range | 1,385 nm (2,565 km) | 1,500 nm (2,778 km) |
| Service Ceiling | 30,200 ft (9,205 m) | 30,000 ft (9,144 m) |
| Max Gross Weight | 7,450 lbs (3,379 kg) | 8,600 lbs (3,901 kg) |
| Useful Load | 2,450 lbs (1,111 kg) | 3,000 lbs (1,361 kg) |
| Fuel Capacity | 213.0 gal (806 L) | 182.0 gal (689 L) |
| Fuel Burn | 35.0 GPH (132 L/h) | 70.0 GPH (265 L/h) |
| TBO | 1,600 hrs | 3,500 hrs |
| Overhaul Cost | $50,000 | $200,000 |
| Annual Fixed | $35,000 | $55,000 |
| Hourly Variable | $400 | $650 |
| Engines | 2 x Piston (Turbocharged) | 2 x Turboprop |
Cost of Ownership
EstimateCessna 421
Fuel$192/hr
Variable$400/hr
Annual Fixed$35,000/yr
Total (200 hrs/yr)
$115,000/yr
Cessna Conquest I
Fuel$385/hr
Variable$650/hr
Annual Fixed$55,000/yr
Total (200 hrs/yr)
$185,000/yr
Which Should You Buy: Cessna 421 or Cessna Conquest I?
Bottom line: Choose the Conquest for turbine reliability, higher cruise and known maintenance intervals. Choose the 421 for lower acquisition cost when piston economics and a pressurised cabin meet the mission — accepting piston-twin engine management.
Pick the 421 if…
- Budget matters — from $138,945 vs $867,150, you save ~$728,205.
- Lower operating cost — ~$400/hr vs $650/hr.
Pick the Conquest I if…
- Faster cruise — 283 kts vs 230 kts.
- Longer range — 1500 nm vs 1385 nm.
- Newer design — production from 1980 vs 1968.
- More inventory — 14 listings vs 7.
Auto-generated from current market data and published specs. Confirm with a pre-buy inspection and professional appraisal.
Frequently Asked Questions
What's the key difference between the Cessna Conquest and the 421?
The Conquest I (Model 425) uses turboprop engines — Pratt & Whitney Canada PT6A-112s — while the 421 Golden Eagle uses piston engines — Continental GTSIO-520s. Both are pressurized twins of similar size and capacity. The turboprop delivers better high-altitude performance, reliability, and time between overhauls; the piston delivers lower acquisition cost. This is the defining choice between them.
Conquest or 421 — which is the right pressurized twin?
Buy the Conquest if turboprop reliability, higher cruise altitude, and lower maintenance anxiety are priorities — and the higher acquisition cost is acceptable. Buy the 421 if acquisition cost is the constraint and you accept the GTSIO-520's maintenance demands and overhaul schedule. The Conquest is the operationally superior aircraft; the 421 is the lower-cost entry to pressurized-twin ownership.
How does turboprop reliability compare to the GTSIO-520?
The PT6A turboprop has a significantly longer TBO and a reputation for exceptional reliability in demanding environments. The GTSIO-520 is a complex geared, turbosupercharged piston engine with a shorter TBO and a more complex maintenance regime. For operators who want to minimise engine-related anxiety, the Conquest's PT6A is the more reliable platform.
How do speed and altitude compare?
The Conquest I cruises approximately 260–265 kt at higher flight levels; the 421 cruises approximately 220–230 kt at lower altitudes. The turboprop's altitude advantage gives it better weather-penetration capability and access to more efficient cruise altitudes. On typical mission legs, the Conquest is meaningfully faster.
How do specs compare?
Conquest I (425): two Pratt & Whitney Canada PT6A-112 (~450 shp each), six to eight seats, pressurized, ~260 kt. 421C: two Continental GTSIO-520 (~375 hp each), six to eight seats, pressurized, ~220 kt.
Which is cheaper to operate?
It is a complex comparison: the PT6A turboprop costs more per overhaul than the GTSIO-520, but has a longer TBO and a lower likelihood of in-flight issues. The GTSIO-520 costs less per overhaul but overhauls more frequently and has higher maintenance complexity. On a per-hour basis, total operating costs are comparable; the Conquest's reliability advantage often justifies the acquisition premium.
Which should I buy?
Conquest for buyers who prioritise turboprop reliability and altitude performance and are willing to pay the acquisition premium. 421 for buyers where acquisition cost is the constraint and the GTSIO-520's maintenance requirements are accepted and budgeted. Both are legitimate aircraft; the Conquest is the operationally superior choice for demanding operations.
Which is better, Cessna 421 or Cessna Conquest I?
It depends on your mission and budget.
The 421 cruises at 230 kts with 1,385 nm range.
The Conquest I cruises at 283 kts with 1,500 nm range.
Review the specs table above to find which fits your flying profile.
How do prices compare?
Cessna 421: from $393,219.
Prices vary by year, hours, avionics, and condition. Always get a pre-buy inspection.
What's the difference between Cessna 421 and Cessna Conquest I?
421 engine: CONTINENTAL GTSIO-520-D (375 hp).
Conquest I engine: PRATT & WHITNEY PT6A-112 (450 hp).
Cruise: 230 vs 283 kts.
Range: 1385 vs 1500 nm.
Which is cheaper to operate per hour?
421: about $400/hr variable cost.
Conquest I: about $650/hr variable cost.
Variable cost includes fuel, reserves and overhaul accruals. Annual fixed costs (hangar, insurance, annual inspection) add to the total.
Which has more seats and useful load?
421: 8 seats / 2,450 lb useful load.
Conquest I: 8 seats / 3,000 lb useful load.
Useful load = max gross weight minus empty weight; it determines how much fuel plus payload you can carry.
How does maintenance compare — TBO and overhaul cost?
421: 1,600-hour TBO, overhaul ~$50,000.
Conquest I: 3,500-hour TBO, overhaul ~$200,000.
Reaching the time-between-overhaul (TBO) triggers a mandatory engine/airframe rebuild that affects resale value.
Disclaimer: All prices and cost estimates are from third-party sources for informational purposes only. Always obtain professional appraisal and inspection before purchase.
Prices updated daily · Data: FAA Registry, NTSB · About our data