The group warned geopolitical and economic instability would make the second half of the year "challenging", despite posting improved half-year results and extending its run of consecutive operating profit growth to 14 quarters.
Tui said the Iran crisis, coming soon after the impact of Hurricane Melissa in Jamaica, created €45 million in additional costs during the second quarter alone, building on an £8.5 million loss that masked an otherwise historical first quarter back in February.