$909 Cheap KLM flights San José (SJO) to Tromsø (TOS)

Use the "Price (lowest to highest)" filter on Expedia to search for cheap KLM round-trip flights from $1,288 from SJO to TOS. Affordable one-way fares from $909 are available as well.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

Check for KLM flights from SJO to TOS about one month before you want to leave. The most affordable time to book an international flight is usually 18 to 29 days ahead of your travel date when you can save 17% versus booking four to five months in advance. No matter your itinerary and fare class, the best day to book international airfare is usually Sunday. Friday can be the most expensive. Passengers booking on a Sunday can save an average of 17% compared to those who book on a Friday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.

Filter your results by "Morning" and "Early Morning" to see the earliest departures from SJO to TOS. Leaving early means you're 20% less likely to experience cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.

A 4-star airline rating and the opportunity to collect points through KLM Flying Blue are the start of the reasons to jet off from SJO to TOS with KLM. Plus, when you join Expedia's free One Key™ program, you can receive OneKeyCash™* in addition to any airline loyalty program earnings. It's yours to spend on future travel plans.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.