Piper Seminole vs Diamond DA42

The Piper Seminole (PA-44, avgas piston twin trainer) and Diamond DA42 (diesel/Jet-A twin) are competing multi-engine trainers — the Seminole is the conventional avgas standard; the DA42 offers modern composite efficiency and Jet-A economics.

Live Market Snapshot

Current asking-price market, aggregated across multiple marketplaces · refreshed daily

Piper Seminole
For sale now
5
Listed on 2+ marketplaces
1
Source marketplaces
4
Model years available
1978–2023
Diamond DA42
For sale now
46
Median asking
$699,900
Range
$520,774–$1,100,160
Listed on 2+ marketplaces
20
Source marketplaces
7
Model years available
2005–2026

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)Piper SeminoleDiamond DA42
All events—7
Serious—1
Fatal—0
Fatalities—0
% Fatal—0%
View full Piper Seminole NTSB record →View full Diamond DA42 NTSB record →

Full Specs Comparison

Swipe to see all specs
Spec / Model Piper Seminole Diamond DA42
Piper Seminole
View 5 listings →
Median $187,260
 Diamond DA42
View 44 listings →
Median $699,900
Price Range $153,780 – $350,178 $520,774 – $1,100,160
Category Multi Engine Piston Multi Engine Piston
Model Specifications
Seats — 4
Cruise Speed 162 kts (300 km/h) 170 kts (315 km/h)
Range 915 nm (1,695 km) 1,050 nm (1,945 km)
Service Ceiling — 18,000 ft (5,486 m)
Max Gross Weight 3,800 lbs (1,724 kg) 3,935 lbs (1,785 kg)
Useful Load — 940 lbs (426 kg)
Fuel Capacity — 50.0 gal (189 L)
Fuel Burn — 12.0 GPH (45 L/h)
TBO — 1,800 hrs
Overhaul Cost — $28,000
Annual Fixed — $20,000
Hourly Variable — $150
Engines — 2 x Diesel

Cost of Ownership

Estimate

Piper Seminole

Diamond DA42

Fuel$66/hr
Variable$150/hr
Annual Fixed$20,000/yr
Total (200 hrs/yr) $50,000/yr

Which Should You Buy: Piper Seminole or Diamond DA42?

Bottom line: Choose the DA42 for fuel efficiency, Jet-A availability and modern glass/composite design. Choose the Seminole for the conventional avgas twin most US schools train on, with the largest fleet and simplest support.

Pick the Seminole if…

  • Budget matters — from $153,780 vs $520,774, you save ~$366,994.

Pick the DA42 if…

  • Faster cruise — 170 kts vs 162 kts.
  • Longer range — 1050 nm vs 915 nm.
  • More inventory — 44 listings vs 5.

Auto-generated from current market data and published specs. Confirm with a pre-buy inspection and professional appraisal.

Frequently Asked Questions

Which is better, Piper Seminole or Diamond DA42?
It depends on your mission and budget. The Seminole cruises at 162 kts with 915 nm range. The DA42 cruises at 170 kts with 1,050 nm range. Review the specs table above to find which fits your flying profile.
How do prices compare?
Piper Seminole: from $165,000. Diamond DA42: from $568,000. Prices vary by year, hours, avionics, and condition. Always get a pre-buy inspection.
What's the difference between Piper Seminole and Diamond DA42?
Cruise: 162 vs 170 kts. Range: 915 vs 1050 nm.
Which is cheaper to operate per hour?
DA42: about $150/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?
DA42: 4 seats / 940 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?
DA42: 1,800-hour TBO, overhaul ~$28,000. 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