I counted this. It took him 12-15 seconds to get there. I think 3-10 seconds for him to show up. Superman can’t neglect air resistance. Neither can the Flash but the Flash got to Iris in 3-4 seconds in Season 8
The bad guy blew himself up, so can't save him. Everyone else either left or died by his hand (looked like they left the scene). Superman just tanked the fire but that was all he could do.