RKTs Progress · Russia · First flight 2006
The modern variant of the legendary R-7 derived Soyuz family, the most launched rocket design in history. Used for ISS crew transport (with Soyuz-2.1a for crewed flights), Glonass navigation, and commercial payloads.
From SpaceNexus's launch tracker (tracked since Nov 21, 2024); outcomes recorded as each flight lands. Career totals above are the vehicle's full history.
| Height | 46.3 m |
| Diameter | 10.3 m |
| Liftoff mass | 312,000 kg |
| Stages | 3 |
| Engines | 4x RD-107A + 1x RD-108A + 1x RD-0124 |
| Propellant | RP-1 / LOX |
| Fairing diameter | 4.11 m |
| Payload to LEO | 8,200 kg |
| Payload to GTO | 3,250 kg |
| Payload to SSO | 4,850 kg |
| Payload to TLI | — |
| Reusable | No |
| First flight | 2006-12-27 |
| Last flight | Active |
| Variants seen on the manifest | Soyuz 2.1a, Soyuz 2.1a Fregat-M, Soyuz 2.1b, Soyuz 2.1b Fregat, Soyuz 2.1b Fregat-M, Soyuz 2.1b Volga, Soyuz 2.1v Volga |
A dedicated Soyuz-2.1b launch lists at roughly $48 million, about $5,854 per kilogram to low Earth orbit at full payload. Actual contract prices vary with orbit, integration and government requirements.
The next tracked Soyuz-2.1b launch is Progress MS-35 (96P) on Sep 9, 2026, 16:15 UTC from Baikonur Cosmodrome, Republic of Kazakhstan. Dates move; Mission Control carries the live countdown.
Soyuz-2.1b has flown 74 times with 72 successes, 2 failures and 0 partial failures — a 97.3% success rate, with 48 consecutive successes at last count.
8,200 kg to low Earth orbit, 3,250 kg to geostationary transfer orbit, 4,850 kg to sun-synchronous orbit.