AirHint found the following cheapest return flights from Denver (DEN) to London (LHR) in June 2026 (see full year).

Return flights

03 Jun - 13 Jun	SWISS
30 Jun - 25 Jul	Lufthansa
16 Jun - 30 Jun	United
10 Jun - 01 Jul	Aer Lingus
30 Jun - 14 Jul	Lufthansa
16 Jun - 30 Jun	British Airways	direct
03 Jun - 27 Jun	WestJet
02 Jun - 27 Jun	WestJet
15 Jun - 11 Jul	WestJet
26 Jun - 14 Jul	United
24 Jun - 18 Jul	Aer Lingus
25 Jun - 08 Jul	Lufthansa
25 Jun - 09 Jul	Lufthansa
23 Jun - 18 Jul	Lufthansa
03 Jun - 27 Jun	British Airways	direct
25 Jun - 08 Jul	British Airways	direct
02 Jun - 27 Jun	British Airways	direct
03 Jun - 13 Jun	Austrian Airlines	direct

Also check the deals for one-way flights from Denver to London in June.

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.

Book a cheap hotel in London

Cheap car rent in London

Cheapest return flights from Denver to London in June from 778€

Return flights