Aer Lingus was founded by the Irish Government in 1936 but is now privatized and part of the International Airline Group (IAG). IAG includes Oneworld partners British Airways and Iberia Airlines. While a part of the IAG group, Aer Lingus is not a true member of the Oneworld alliance.

No, Aer Lingus is not a member of the oneworld alliance in 2026. While the Irish flag carrier was a member until 2007, it currently operates as a non-aligned airline, though it is a wholly-owned subsidiary of IAG (International Airlines Group), the same parent company as British Airways and Iberia. Because of this corporate relationship, Aer Lingus maintains extensive "bilateral" partnerships with oneworld members. For 2026 travelers, this means you can often earn and redeem British Airways Avios on Aer Lingus flights and enjoy codeshare benefits. However, standard oneworld perks—like "Sapphire" or "Emerald" lounge access or priority boarding—do not automatically apply when flying Aer Lingus unless you are specifically booked on a codeshare flight or have status within their own "AerClub" program that overlaps with IAG partners.