Train from Prague to Salzburg

Please provide us with a specific date. There are track repairs ongoing during certain weeks which will have effects on the train schedule.

The best way to buy them is probably from the czech rail company.

https://www.cd.cz/en/default.htm

You should also check the Austrian company. Same trains. By the cheapest that meets your schedule.
https://www.oebb.at/en/

Traveling on September 4th in AM time

If you must go from point A to point B on a particular date it doesn’t change what train company website you go to.

At 10:21 in the morning OBB has a train that is about five and a half hours, with one change, and the thing worth laughing about is that OBB has a cheap 1st class seat for 54.80€ with the seat assignment or a 95.90 full price 2nd class seat with the seat assignment.

Ceske Drahy has the same train, 2nd class for 496 koruna which is about 21€ including the seat assignment. Sort of what I expected.

But check me on that. I did it pretty quickly.

I don't get quite the same results but do agree that Czech Railways is (as usual Cheapest) and that the upgrade to 1st class is modest enough that I wouldn't hesitate to do it.

OBB- 2nd class €95.90 cancellable to 3 Sep (use any train that day); 1st class non refundable- €54.80, refundable free until 20 Aug, thereafter for a fee of €35.25- €70.50 (that train only), €158.10 (any train that day)

CD- 2nd class 694 CZK (assigned seats only to Linz, refundable to 3 Sep), €28.65 , 2029 CZK (use any train that day)- €83.76- , 1st class 1265 CZK (assigned seats only to Linz, refundable to 3 Sep for a fee of €3)- €52.22

Yes, I accept that Czech Railways don't seemingly reserve beyond Linz, but I just don't see that as an issue on OBB- if you do then making a reservation on OBB for Linz to Salzburg doesn't alter the basic mathematics.

You can make a seat assignment with OeBB without having bought the ticket from them.