Travellers flying out of Dubai's airports will pay a new fee to cover improvements at the long-haul hub, the city-state's crown prince has announced, as Gulf countries grapple with low oil prices.

Passengers departing from Dubai will pay a 35-dirham ($13.77) service fee for flights leaving after June 30 that have been booked since March 1, according to a statement from Sheikh Hamdan bin Mohammed bin Rashid Al Maktoum.

That includes most passengers transiting through Dubai International Airport, the world's busiest for international travel, though children under two will be exempt.

The statement said the fee will go toward expansion projects like Dubai International Airport's new Concourse D, the expansion of the airport's Terminal 2 and the renovation of Terminal 1. The city is also expanding Al Maktoum International Airport at Dubai World Central, with hopes of one day transferring all Emirates airline flights there.

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The statement offered no revenue estimates.

Over 78 million passengers passed through Dubai International Airport in 2015 alone, which could have brought in more than US$740 million ($1068 million at current exchange rate) had the fee been placed.

Al Maktoum International Airport at Dubai World Central, in Dubai's desert expanse near where it will host the 2020 World Expo, saw over 460,000 passengers in 2015, which could have meant another US$4.3 million.

While airport fees are levied across the world, Dubai's announcement comes as oil prices have slumped to under US$40 a barrel. Those low prices, which are likely to remain depressed for some time, have forced the United Arab Emirates and its Gulf neighbours to consider taxes and levy other fees to raise money.

- AAP