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United / Swiss Air offers round-trip fares from Los Angeles (LAX) to Barcelona (BCN) priced between $ 304~$ 369 making one stop at Zurich or Newark for 2 hours for travel between November 2019 to March 2020.
Prices vary based on dates and these are basic economy fares that allows 1 personal + 1 carry on item.

Travel Dates (subject to availability)
Depart LAX November 5-6, 12-13, 17— Depart BCN November 13-14, 20-21, 25
Depart LAX December 1, 3-5, 8, 10 — Depart BCN December 9, 11-13, 16, 18