Sonic vs Xfinity
These two overlap in 4 metro areas and 59 towns and cities, so for a lot of people this is a real choice rather than a hypothetical one. The first question is not which is better. It is which of them can reach you.
Sonic vs Xfinity at a glance
| Measure | Sonic | Xfinity |
|---|---|---|
| Main technology | Fiber | Cable |
| Residential locations on that technology | 406,292 | 37,853,193 |
| Single technology or mixed | Single | Mixed |
| Full coverage detail | Where Sonic is available | Where Xfinity is available |
We do not publish speeds or prices here. Both providers change them constantly and by market, and a stale number is worse than no number. Coverage is the part that is federally reported and verifiable.
Where you can get both
Metro areas where both Sonic and Xfinity report service, ranked by how well covered the less available of the two is because that is what decides whether you genuinely get a choice.
| Metro area | Sonic | Xfinity |
|---|---|---|
| San Francisco-Oakland-Berkeley, CA Metro Area | 27% | 98% |
| Santa Rosa-Petaluma, CA Metro Area | 14% | 93% |
| San Jose-Sunnyvale-Santa Clara, CA Metro Area | 5% | 89% |
| Vallejo, CA Metro Area | 4% | 92% |
Where only one of them reaches
Sonic reports service in 2 states and Xfinity in 41, and they share 2 of them. Overlap is the exception, not the rule, so if you are outside the table above this is the part that answers your question.
2 metro areas have Sonic and not Xfinity
- Los Angeles-Long Beach-Anaheim, CA Metro Area 1% covered
- Dallas-Fort Worth-Arlington, TX Metro Area 0% covered
350 metro areas have Xfinity and not Sonic
- Barnstable Town, MA Metro Area 100% covered
- Key West, FL Micro Area 99% covered
- Ocean City, NJ Metro Area 99% covered
- Boston-Cambridge-Newton, MA-NH Metro Area 98% covered
- Atlantic City-Hammonton, NJ Metro Area 98% covered
- Vineyard Haven, MA Micro Area 98% covered
- Philadelphia-Camden-Wilmington, PA-NJ-DE-MD Metro Area 97% covered
- Los Alamos, NM Micro Area 97% covered
States where only Xfinity reports service: Alabama, Arizona, Arkansas, Colorado, Connecticut, Delaware, District of Columbia, Florida, Georgia, Idaho, Illinois, Indiana and 27 more.
Showing the eight best covered of each. Ranked by reported coverage within the metro, from the same FCC filing as the table above. Providers self report and overstate, so read these as a ceiling on where a company will sell to you, not a promise about your street.
Which should you pick?
Honestly, in most of the places above only one of them will actually reach your building, and that settles it. Where both do reach you, the useful question is the technology rather than the brand.
That is the case here: Sonic is mainly fiber and Xfinity is mainly cable. The practical difference is upload speed and consistency rather than headline download speed, we explain what that means here.
See which one reaches your address →
What we will not do is tell you one is better because it pays us more. See the affiliate disclosure for how that works.