AirHint found the following cheapest return flights from Bilbao (BIO) to Oslo (OSL) in April 2026 (see full year).

Return flights

15 Apr - 18 Apr	Air Europa
14 Apr - 19 Apr	Iberia
25 Apr - 02 May	Air Europa
13 Apr - 19 Apr	Air Europa
13 Apr - 18 Apr	Air Europa
01 Apr - 08 Apr	Norwegian
04 Apr - 08 Apr	Lufthansa
03 Apr - 20 Apr	Iberia
01 Apr - 18 Apr	Norwegian
01 Apr - 18 Apr	Norwegian	direct
15 Apr - 18 Apr	Norwegian	direct
25 Apr - 09 May	Norwegian
25 Apr - 09 May	Norwegian	direct
25 Apr - 16 May	Norwegian	direct
25 Apr - 02 May	Norwegian	direct
25 Apr - 13 May	Norwegian
25 Apr - 13 May	Norwegian	direct

Also check the deals for one-way flights from Bilbao to Oslo in April.

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 Bilbao to Oslo in April from 148€

Return flights