AirHint found the following cheapest return flights from London (LON) to Hanoi (HAN) in May 2026 (see full year).

Return flights

22 May - 29 May	Air China
21 May - 13 Jun	Air China
23 May - 06 Jun	Air China
29 May - 05 Jun	Air China
06 May - 18 May	Ryanair
24 May - 30 May	Air China
03 May - 17 May	Air China
14 May - 25 May	Air China
03 May - 18 May	Air China
06 May - 21 May	Air China
23 May - 30 May	Air China
24 May - 31 May	Air China
17 May - 31 May	Air China
24 May - 03 Jun	Air China
24 May - 01 Jun	Air China
23 May - 13 Jun	Air China
04 May - 03 Jun	Singapore Airlines
11 May - 01 Jun	Singapore Airlines
13 May - 03 Jun	Singapore Airlines
22 May - 01 Jun	Air China

Also check the deals for one-way flights from London to Hanoi 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 Hanoi in May from $646

Return flights