Rules for traveling to Spain:
All persons entering the territory of Spain must have one of the following declarations:
1) confirmation of completed vaccination
2) confirmation of Covid-19 disease
3) confirmation of a negative PCR or antigen test result
If the passenger holds one of the above certificates in the EU DIGITAL COVID CERTIFICATE format, he does not have to fill in any other form.
If you do not have a confirmation in this format, you must fill out the Spain Travel Health online form. here
Detailed information for traveling to Spain can be found on the website: here
Rules for return to the Czech Republic:
When returning from abroad, it is not necessary to fill in the Arrival Form or submit a proof of infectivity.
Detailed information for returning to the Czech Republic can be found on the website: here