BLS International (Slovakia VAC): In Thailand, Slovakia uses BLS International in Bangkok to collect visa applicationsblsslovakiavisa.com. You’ll apply at the BLS Slovakia Visa Application Centre (likely co-located with BLS Spain at Interchange 21). Make an appointment through their system and bring all required docs; BLS will forward them to the Slovak Embassy (which might be in another country if not Bangkok).
Invitation letter: Include an invitation letter from your Slovak partner. Slovakia doesn’t have a widespread formal invitation requirement for tourists, but ensure the letter has both your details and your partner’s, plus travel dates and an undertaking that you will leave on time. If your partner is a foreigner living in Slovakia, add a copy of their residency card. There is also an official “Affidavit of Invitation” in Slovak that your partner could notarize, but for a short visit it’s usually not needed if you have a personal letter and good evidence of relationship.
Expect thorough checks: The application might be sent to the Slovak Embassy in another country (possibly in Hanoi or somewhere in the region). They could be thorough since they don’t get many Thai applicants. Double-check all documents: flight itinerary, insurance (make sure it specifically covers the Schengen area including Slovakia), bank statements, etc. Provide a day-by-day itinerary even if just “spending time in hometown with partner” – it shows preparation.
Financial and sponsor notes: If your partner will cover costs, mention it in the letter and attach their financial proof. Slovakia’s cost of living is lower than Western Europe, so a modest bank balance might suffice if the trip is short, but still meet the general Schengen guideline (around €50/day). BLS might ask for proof of accommodation – a letter from your partner plus perhaps a utility bill or address registration could help to prove you have a place to stay.
Return ties: Emphasize ties to Thailand (job, studies, family). Slovakia isn’t known to be super strict, but because your application is handled via a third party, any doubt can cause delays or additional questions. It’s better to oversupply evidence of return (like a letter from your employer and copies of property deeds, etc.) to preempt concerns.