Originally Posted by
CPH-Flyer
I am guessing you are taking the Thai departure around 5pm, so land between 2pm and 3pm.
There can be a fair bit of rush in the afternoon immigration in Narita, though this might be a bit early for it.
It is possible to make the connection, but it does not leave much room for any kind of delays. Personally I would not do it, I would want more space between the two flights.
+1
To me, it's all about "plan B", what is your plan if DL happens to get you to NRT late? Are you ok with an overnight stay at NRT (in the relatively unlikely event the DL flight is late)?