B737 pilot reported similar sounding call sign on the same route could have caused confusion.

Attributes
ACN	1444539
Time
Date	201704
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Climb Cruise Descent
Flight Plan	IFR
Aircraft 2
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Cruise Descent Climb
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 106
Events
Anomaly	ATC Issue All Types Deviation - Procedural Published Material / Policy

Narrative:

I would like to bring awareness to similar call signs. We departed as flight 1234. We soon found we were following flight 3412 through similar airspace as we were switched to the same frequencies 4 times. While there were no errors on our part or ATC; the ATC controllers commented on this being a confusing situation. 3412 and 1234 are easily confused.

Original NASA ASRS Text

Title: B737 pilot reported similar sounding call sign on the same route could have caused confusion.

Narrative: I would like to bring awareness to similar call signs. We departed as flight 1234. We soon found we were following flight 3412 through similar airspace as we were switched to the same frequencies 4 times. While there were no errors on our part or ATC; the ATC controllers commented on this being a confusing situation. 3412 and 1234 are easily confused.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.