There must be a transition to decentralised approaches, as the conventional centralised travel authentication methods leave information open to leaks, unauthorised access, and inefficiency, and therefore, secure, efficient, and privacy-protected travel authentication is necessary in the face of rising cyberattacks and identity theft. In this paper, the authors introduce a blockchain-traveller authentication system founded on decentralised identity management, cryptographic protection, and smart contracts for injecting additional security, efficiency, and compatibility into the travel chain. The solution is in the form of developing and deploying a permissioned blockchain network, for example, Hyperledger Fabric or consortium chain, with controlled access provided to various stakeholders, for example, immigration departments, airlines, and hotels. The architecture employs cryptographic protocols including asymmetric encryption, zero-knowledge proofs (ZKPs), and digital signatures to safeguard traveller credentials through possession of private data retained by the users. Principles of Self-Sovereign Identity (SSI) are utilised in order to facilitate travellers storing, sharing, and holding identity credentials in an external-party-free digital wallet. Smart contract-based automated identity verification eliminates manual intervention and reduces delay at airport terminals, border crossing stations, and hotel receptions. Pre-determined authentication rules are applied by self-executing contracts, verifying traveller credentials in real time against blockchain databases. The system also ensures interoperability among multiple regulatory systems and stakeholders based on open standards like W3C's Verifiable Credentials, Decentralised Identifiers (DIDs), and blockchain interoperability standards like Interledger and Hyperledger Cactus. The system adheres to global data privacy compliance with norms like GDPR and ICAO standards using privacy-preserving technologies like off-chain storage of sensitive attributes, role-based access control, and multi-factor authentication (MFA). To verify the functioning of the suggested authentication system, four of the most important performance measures were evaluated: authentication accuracy, efficiency in processing time, security resilience, and user satisfaction. According to the findings, there is high accuracy in biometric authentication (97.8%), comparison of digital credentials (98.5%), and verification of smart contracts (99.2%) to provide effective verification of identity. Processing time efficiency was also outstanding, with intelligent contract deployment 95.7% efficient and blockchain record retrieval 93.5% successful, cutting authentication delay. Resilience against security threats was quantified as the system's ability to resist identity fraud, data tampering, and illicit access, standing at 98.9% immunity against identity theft and 99.5% security by means of data protection mechanisms. User satisfaction, as expressed in traveller, immigration officer, and airline personnel feedback, was high usability and trust, with an overall system reliability rating of 95.3%. The results indicate the promising potential of blockchain authentication systems to improve global travel security through an effective and privacy-aware verification process. By avoiding dependency on external databases and third-party intermediaries, the new system drastically reduces identity fake risks, simplifies data protection compliance, and enhances operational efficiency. Scalability and resiliency of blockchain technology are noted as strong appealing remedies to checking travellers and, in so doing, opening up potential for even more comprehensive applications for the travel sector. Future research will be directed towards maximising system performance, improving blockchain interoperability, and incorporating new technologies like artificial intelligence (AI) and biometric technologies to further streamline identity verification processes.