Is AT&T or Xfinity (Comcast) faster?

Based on 1,163 verified speed tests, Xfinity (Comcast) is faster overall. AT&T averages 305 Mbps download, Xfinity (Comcast) averages 349 Mbps download.

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

The average download speed difference is 44 Mbps. Upload speed difference is 92 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 1,163 verified measurements.

Overall Winner: Xfinity (Comcast)

AT&T

Download

305 Mbps

Upload Wins

180 Mbps

Ping

39 ms

Based on 382 measurements · Full AT&T stats →

Xfinity (Comcast)

WINNER

Download Wins

349 Mbps

Upload

88 Mbps

Ping Wins

32 ms

Based on 781 measurements · Full Xfinity (Comcast) stats →

Speed Difference Summary

Download difference

44 Mbps

Xfinity (Comcast) is faster

Upload difference

92 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 (382 tests)

Xfinity (Comcast) 349 Mbps (781 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 1,163 verified speed tests from AT&T and Xfinity (Comcast) customers, Xfinity (Comcast) delivers faster average speeds.

AT&T averages 305 Mbps download with 180 Mbps upload and 39 ms ping. Xfinity (Comcast) averages 349 Mbps download with 88 Mbps upload and 32 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