I find this to still be current...
To travel with Viking please ensure you have the following:
1. Valid Passport- must be valid for 6 months beyond your planned trip dates.
2. Proof of full COVID-19 immunization
- Viking strongly recommends a booster dose administered when eligible. Some countries along your itinerary may require
a booster dose for entry.
3. Proof of negative COVID-19 Test (laboratory-certified) Viking does accept select at-home COVID-19 tests. - PCR test taken within 72 hours prior to boarding first international flight, (or joining Viking if traveling independently,) or
- Antigen test taken within 24 hours prior to boarding first international flight (or joining Viking if traveling independently,)
- UK Guests: if you use an antigen test (lateral flow), the testing provider must issue a fit to fly certificate.
- And/or Proof of Recovery: If you have recovered from a COVID-19 infection (within 10–90 days prior to departure) ensure
you carry documentation of recovery or a positive PCR test result from the time of infection.