$234 Cheap KLM flights London (LHR) to Tromsø (TOS)

Scoring cheap one-way KLM flights from LHR to TOS from $234 on Expedia couldn't be easier — just filter by "Price (lowest to highest)." Or check out our budget-friendly round-trip fares from $426 for your next getaway.**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.

Landing the best KLM deals from LHR to TOS often comes down to booking at the right time. You can save 17% on international flights when you book 18 to 29 days before takeoff instead of four to five months ahead. To top it off, you can pocket 17% on average by buying your fare on a Sunday compared to a Friday, which is often the most expensive day to book.* It's a good idea to start searching for flights about one month before you plan to travel.*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 find the earliest flights from LHR to TOS. Setting off early means you're 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.

Offering a 4-star airline rating, KLM is a favorite of many travelers departing from LHR to TOS. Plus, as a KLM Flying Blue and One Key™ member booking through Expedia, you can earn OneKeyCash™* on eligible flights on top of your airline miles.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.