Direct proof of use
The Su-30 is documented in the 2011 Syrian Civil War through Russian Su-30SM aircraft deployed near Latakia at the start of Russia's direct military intervention. Bellingcat identified four Russian Su-30SM aircraft in Airbus satellite imagery of al-Assad International Airport in September 2015, correcting earlier reporting that had described the aircraft as Su-27s.
The aircraft's operational use is documented beyond simple presence. RAND's study of the Russian air campaign describes the initial Russian Hmeimim air wing as including four Su-30SM air-superiority fighters paired with Su-34 fighter-bombers for air-to-air support and precision-guided effects. CBS News later described Russian Su-30SM fighters prepared at a Russian base in northwest Syria in December 2015 and reported that the aircraft conducted air strikes against anti-regime armed groups, including U.S.-backed rebels and jihadist groups.
Sources: Bellingcat Russian SU-30SM in Syria, RAND Russian Air Campaign in Syria, CBS Russian Warplanes In Syria
Timeline
Open-source reporting places the Su-30SM deployment before Russia publicly began its air campaign on September 30, 2015. The Aviationist reported that four Russian Su-30SM aircraft arrived at al-Assad International Airport near Latakia on September 18, and Bellingcat published its satellite-imagery identification two days later.
In the campaign structure that followed, RAND places the Su-30SM inside the initial Hmeimim fixed-wing package, where it provided air-superiority and support functions alongside Russian strike aircraft. CBS's December 2015 base reporting ties the same variant to prepared combat operations and air strikes during the early Russian intervention period.
Sources: Aviationist Su-30SM Latakia Deployment, Bellingcat Russian SU-30SM in Syria, RAND Russian Air Campaign in Syria, CBS Russian Warplanes In Syria
Narrative
The Syrian Civil War Su-30 record is Russian rather than Syrian. The aircraft were fielded by Russian forces after Moscow moved fixed-wing combat aircraft to the Latakia area in support of Bashar al-Assad's government. The available sources support use from Russia's northwest Syria base network, not transfer of Su-30 aircraft to the Syrian Arab Air Force.
In that role, the Su-30SM appears as both an air-superiority asset and a multirole strike aircraft. RAND describes the initial deployment as part of a Russian package built around attack, close-air-support, fighter-bomber, and air-superiority aircraft, with Su-30SMs contributing air-to-air support. CBS adds direct strike use against anti-regime armed groups. The public source record does not support a complete sortie count or a reliable list of specific targets struck by Su-30SMs.
Sources: RAND Russian Air Campaign in Syria, CBS Russian Warplanes In Syria, Bellingcat Russian SU-30SM in Syria