The cheapest round-trip from Oslo to Barcelona is about 89 EUR, usually in December 2026; February 2027 is priciest, so booking the low month saves around 209 EUR (~70%). Typical fare ~99 EUR, from 193 priced fares. Flightmussy live data, updated 2026-06-03.
Cheap flights from Oslo (OSL/TRF) to Barcelona (BCN/GRO/REU). Free, no signup, no ads, no tracking. Compare every airline across 12 months of fares on one heatmap — including low-cost carriers Google Flights often deprioritises.
Cheapest round-trip seen: 89 EUR, usually around December 2026. Typical fare ~99 EUR. Across the year prices range roughly 89–298 EUR — about 70% cheaper in the low season than the peak (February 2027). Carriers on this route include Vueling, Norwegian.
Based on Flightmussy's live 12-month fare data; prices last updated 2026-06-03. Prices change constantly — search live for current fares.
Share this finding: post on X · image card for Instagram / WhatsApp.
Flightmussy is a free, independent flight search for travellers anywhere in the world. No signup, no ads, no tracking — email is optional, only for route price alerts. Compare fares across every airline and see 12 months of prices at a glance, including the low-cost carriers Google Flights often buries. Book directly with the airline or a trusted partner — we never add a markup.
Flightmussy runs its own 12-month forward fare scans across thousands of routes worldwide and publishes the data openly. Read the cheapest month to fly almost anywhere → — a global study of when fares are lowest — or browse the cheapest destinations from a city: