Is AT&T or Xfinity (Comcast) faster?

Based on 3,473 verified speed tests, Xfinity (Comcast) is faster overall. AT&T averages 303 Mbps download, Xfinity (Comcast) averages 358 Mbps download.

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

The average download speed difference is 55 Mbps. Upload speed difference is 63 Mbps. Ping difference is 7 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 3,473 verified measurements.

Overall Winner: Xfinity (Comcast)

AT&T

Download

303 Mbps

Upload Wins

134 Mbps

Ping

40 ms

Based on 1,449 measurements · Full AT&T stats →

Xfinity (Comcast)

WINNER

Download Wins

358 Mbps

Upload

71 Mbps

Ping Wins

33 ms

Based on 2,024 measurements · Full Xfinity (Comcast) stats →

Speed Difference Summary

Download difference

55 Mbps

Xfinity (Comcast) is faster

Upload difference

63 Mbps

AT&T is faster

Ping difference

7 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 305 Mbps (1441 tests)

Xfinity (Comcast) 358 Mbps (2024 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 3,473 verified speed tests from AT&T and Xfinity (Comcast) customers, Xfinity (Comcast) delivers faster average speeds.

AT&T averages 303 Mbps download with 134 Mbps upload and 40 ms ping. Xfinity (Comcast) averages 358 Mbps download with 71 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