To conclude:
Season 2 Flash is listed as "At least Massively Hypersonic+" for being 4 times faster than his Season 1 version.
However, his Season 1 version is actually a very high level of Massively Hypersonic+ (Mach 6361). 4 times faster than that would definitely be Sub-Relativistic. Since Cisco says Barry gone 4 times faster than the ever did before, so this is legit. Scales to Zoom and Reverse-Flash.
Season 3 Barry would be At least Sub-Relativistic for being faster than before. Scales to Savitar. Savitar while trapped in the speed force is Sub-Relativistic+ for blitzing Barry.
Season 4 Barry is 5 times faster than before. That would actually be Relativistic. Scales to Earth-X Reverse-Flash.
Portal Creation for Barry, Savitar, Eobard, Jay, Wally (if a profile is made), possibly other speedsters.
Resistance to Diseases, Drugs, Toxins and Poisons for Barry, possibly other speedsters due to increased metabolism.
Limited Clairvoyance for Zoom.
A note on Barry's profile that he was able to defeat Trajectory, who collapsed a bridge. A good supporting feat.
A note on Season 1 Barry's speed rating that he got faster at the end of the season to keep up with Thawne
A note that Season 2 Barry blitzed his Season 1 self
Limited Resistance to Mind Control for Barry.