AirHint found the following cheapest return flights from London (LGW) to Tromso (TOS) in May 2026 (see full year).

Return flights

07 May - 10 May	Norwegian
06 May - 10 May	Norwegian
20 May - 26 May	Norwegian
21 May - 28 May	Norwegian
20 May - 01 Jun	Norwegian
06 May - 26 May	Norwegian
20 May - 08 Jun	Norwegian
12 May - 26 May	Norwegian
21 May - 26 May	Norwegian
12 May - 01 Jun	Norwegian
26 May - 01 Jun	Norwegian
26 May - 08 Jun	Norwegian
21 May - 01 Jun	Norwegian
21 May - 08 Jun	Norwegian
06 May - 20 May	Norwegian
26 May - 28 May	Norwegian
13 May - 01 Jun	Norwegian
29 May - 01 Jun	Norwegian
13 May - 26 May	Norwegian
29 May - 05 Jun	Norwegian

Also check the deals for one-way flights from London to Tromso in May.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from London to Tromso in May from $264

Return flights