AirHint found the following cheapest return flights from Sao Paulo (GRU) to London (LTN) in December 2025 (see full year).

Return flights

03 Dec - 29 Dec	Royal Air Maroc
02 Dec - 15 Dec	Air China
14 Dec - 19 Jan	Royal Air Maroc
02 Dec - 09 Dec	Royal Air Maroc
02 Dec - 08 Dec	Royal Air Maroc
02 Dec - 06 Dec	Royal Air Maroc
09 Dec - 23 Jan	Air Europa
10 Dec - 30 Jan	Iberia
05 Dec - 11 Dec	Royal Air Maroc
14 Dec - 01 Jan	Royal Air Maroc
07 Dec - 13 Dec	TAP
14 Dec - 30 Dec	Royal Air Maroc
07 Dec - 14 Jan	Royal Air Maroc
15 Dec - 19 Jan	TAP
05 Dec - 13 Dec	TAP
08 Dec - 15 Dec	TAP
04 Dec - 19 Jan	TAP
19 Dec - 24 Jan	Royal Air Maroc
14 Dec - 06 Jan	Royal Air Maroc
04 Dec - 01 Jan	TAP

Also check the deals for one-way flights from Sao Paulo to London in December.

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 Sao Paulo to London in December from 636€

Return flights