AirHint found the following cheapest return flights from London (LHR) to Hanoi (HAN) in July 2025 (see full year).

Return flights

16 Jul - 21 Jul	Oman Air
09 Jul - 23 Jul	China Eastern
14 Jul - 19 Jul	Oman Air
13 Jul - 21 Jul	Air India
10 Jul - 15 Jul	Air India
12 Jul - 24 Jul	British Airways
11 Jul - 25 Jul	British Airways
11 Jul - 24 Jul	British Airways
13 Jul - 16 Jul	Air India
11 Jul - 23 Jul	British Airways
24 Jul - 03 Aug	KLM
09 Jul - 09 Aug	Shenzhen Airlines
22 Jul - 10 Aug	Oman Air
13 Jul - 17 Aug	Air India
21 Jul - 09 Aug	Air India
09 Jul - 06 Aug	Shenzhen Airlines
14 Jul - 04 Aug	Air India
15 Jul - 05 Aug	Air India
29 Jul - 05 Aug	KLM
13 Jul - 10 Aug	Air India

Also check the deals for one-way flights from London to Hanoi in July.

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 July from 745€

Return flights