The cheapest round-trip from Oslo to Chicago is about 460 EUR, usually in November 2026; August 2026 is priciest, so booking the low month saves around 161 EUR (~26%). Typical fare ~471 EUR, from 304 priced fares. Flightmussy live data, updated 2026-06-03.
Cheap flights from Oslo (OSL/TRF) to Chicago (ORD/MDW). 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: 460 EUR, usually around November 2026. Typical fare ~471 EUR. Across the year prices range roughly 460–621 EUR — about 26% cheaper in the low season than the peak (August 2026). Carriers on this route include Tap Air Portugal, Icelandair, Finnair.
Based on Flightmussy's live 12-month fare data; prices last updated 2026-06-03. Prices change constantly — search live for current fares.
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