I am no expert on the Su-27 series, yet I felt it might help to sort out all the different designations in the flanker family. Everyone, please feel free to correct and add to this table.

Su-27 original series production single seat fighter

Su-27UB uchebno-boevoi / trainer-combat
2 seat trainer

Su-27UBK uchebno-boevoi kommercheski / trainer-combat, commercial
2 seat trainer

Su-30 series new designation of Su-27P

Su-33 new designation of Su-27K
single seat, w/ canards

Su-34 new designation of Su-27IB
2 seat side-by-side, ground attack

Su-35 new designation of Su-27M
single seat, ground attack, w/ canards

Su-27P* perspektivnyi / advanced
old designation of Su-30

Su-27K* karabliy / naval
old designation of Su-33

Su-27IB* istrebitely-bombardirovchik / fighter-bomber
old designation of Su-34

Su-27M* mnogofunktsionalniy / multirole
old designation of Su-35

Su-30KN karabliy n- / naval ?-
2 seat, multirole, no canards

Su-30MKI modernizirovanny kommercheski dla Indiya
modernized commercial for India
2 seat, multirole, w/ canards

Su-30MKK modernizirovanny kommercheski dla Kitaya
modernized commercial for China
2 seat, multirole, no canards

Su-30KI kommercheski dla Indoneziyskiy / commercial for Indonesia
single seat, no canards
only Su-30 standard as single-seater

Su-30MKM modernizirovanny kommercheski dla Malaziya
modernized commercial for Malaysia

Su-32 export version of Su-34
2 seat, ground attack, w/ canards
2 seat, multirole, w/ canards

Su-37 "super flanker"
1 seat, multirole, w/ canards

[Edited on 16-5-2004 by Amet Khan]

Is this a source link or compiled on your own? Link would be appreciated if it is indeed from a source.
Interesting information and from material I have seen and read, looks seemingly accurate.


seekerof

I think your list is pretty good, although I believe the Su-37 is a single seat model.

Every time I read an Aviation Week or Flight International, they seem to mention some new variant of the Su-27 family. These are some of the more recent ones. Do you have any idea what they stand for?

Su-27SK
Su-27SM
Su-30KN
Su-30MK2