Is AT&T or Xfinity (Comcast) faster?

Based on 3,238 verified speed tests, Xfinity (Comcast) is faster overall. AT&T averages 297 Mbps download, Xfinity (Comcast) averages 355 Mbps download.

What is the average speed difference between AT&T and Xfinity (Comcast)?

The average download speed difference is 58 Mbps. Upload speed difference is 66 Mbps. Ping difference is 8 ms.

Should I choose AT&T or Xfinity (Comcast)?

It depends on your use case. Xfinity (Comcast) offers faster average speeds, but actual performance varies by location and plan. Test your current connection and compare to both averages before switching.

AT&T vs Xfinity (Comcast)

Full speed comparison based on 3,238 verified measurements.

Overall Winner: Xfinity (Comcast)

AT&T

Download

297 Mbps

Upload Wins

138 Mbps

Ping

41 ms

Based on 1,339 measurements · Full AT&T stats →

Xfinity (Comcast)

WINNER

Download Wins

355 Mbps

Upload

72 Mbps

Ping Wins

33 ms

Based on 1,899 measurements · Full Xfinity (Comcast) stats →

Speed Difference Summary

Download difference

58 Mbps

Xfinity (Comcast) is faster

Upload difference

66 Mbps

AT&T is faster

Ping difference

8 ms

Xfinity (Comcast) has lower latency

By Country

Head-to-head comparison where both ISPs have user data.

United States Xfinity (Comcast) wins

AT&T 299 Mbps (1331 tests)

Xfinity (Comcast) 355 Mbps (1899 tests)

Test your own speed

See if your connection matches the AT&T or Xfinity (Comcast) average.

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How AT&T Compares to Xfinity (Comcast)

Based on 3,238 verified speed tests from AT&T and Xfinity (Comcast) customers, Xfinity (Comcast) delivers faster average speeds.

AT&T averages 297 Mbps download with 138 Mbps upload and 41 ms ping. Xfinity (Comcast) averages 355 Mbps download with 72 Mbps upload and 33 ms ping.

Averages tell only part of the story — actual speeds vary by your specific plan, location, time of day, and whether you use Ethernet or Wi-Fi. Run a speed test on your current connection to see how it compares to both averages before making a switching decision.

AT&T speed Xfinity (Comcast) speed All ISPs Country speeds