Since you are using a source, make sure the subtitle filename includes "BluRay" or "BRRip." If you download a subtitle meant for a "Digital" or "WEB-DL" source, the timing might be slightly off due to different frame rates or studio logos at the beginning.
: Great for hearing-impaired (HI) versions and high-quality translations if you need languages other than English. Quick Tip for Syncing: subtitle Spider-Man.Homecoming.2017.1080p.BluRa...
Below are the most reliable platforms to find and download subtitles for that specific 1080p BluRay rip: Since you are using a source, make sure
: While primarily associated with YTS rips, these subtitles are generally compatible with most 1080p BluRay versions of the film. : One of the largest databases available
: One of the largest databases available. It usually has dozens of versions for the BluRay release to ensure the timing (sync) is perfect.
It seems you are looking for subtitle files specifically for the Blu-ray release.