Is AT&T or Xfinity (Comcast) faster?

Based on 2,263 verified speed tests, Xfinity (Comcast) is faster overall. AT&T averages 300 Mbps download, Xfinity (Comcast) averages 351 Mbps download.

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

The average download speed difference is 51 Mbps. Upload speed difference is 88 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 2,263 verified measurements.

Overall Winner: Xfinity (Comcast)

AT&T

Download

300 Mbps

Upload Wins

171 Mbps

Ping

39 ms

Based on 873 measurements · Full AT&T stats →

Xfinity (Comcast)

WINNER

Download Wins

351 Mbps

Upload

83 Mbps

Ping Wins

32 ms

Based on 1,390 measurements · Full Xfinity (Comcast) stats →

Speed Difference Summary

Download difference

51 Mbps

Xfinity (Comcast) is faster

Upload difference

88 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 300 Mbps (873 tests)

Xfinity (Comcast) 351 Mbps (1390 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 2,263 verified speed tests from AT&T and Xfinity (Comcast) customers, Xfinity (Comcast) delivers faster average speeds.

AT&T averages 300 Mbps download with 171 Mbps upload and 39 ms ping. Xfinity (Comcast) averages 351 Mbps download with 83 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