Swansea's promotion to the Premier League could boost the city's economy as it attracts thousands of new visitors to the area.
Blackpool estimates its season long stay in the top flight brought about £30m of extra business to the resort.
There are hopes a similar sum can be achieved in Swansea, where tourism was worth £317m to the economy in 2010.
While Monday's play-off win at Wembley is estimated to be worth around £90m to the club, its value to the city as a whole is much harder to quantify.
Tony McGetrick, chairman of Tourism Swansea Bay, said he was sure it would boost businesses.
"Every other week throughout the season Swansea is going to be promoted on the most watched football league in the world," he said.
"It's fantastic advertising you could not pay for because it's a completely new market of people."
"There is also a feelgood factor that has many benefits as success breeds success," he added.
The North and Western Lancashire Chamber of Commerce said the past season in the Premier League had been worth about £30m to the economy of Blackpool.
Elsewhere, Portsmouth dropped out of the top flight a season ago, and Maureen Frost, director of operations at the city's chamber of commerce, said while they had no figures on the cost to the area of relegation, they had seen a difference.
"Being in the Premiership seemed to bring a feel good factor and confidence to the city," she said.
She said many away supporters would travel to Portsmouth by train, often bringing family members with them who would then visit the tourist attractions, shops and restaurants rather than go to the match.
"The club is also spending less," she added.
"It is still a real part of the community but that has a knock-on affect on a number of small local businesses - for example, printers as they do not need as many programmes."
Meanwhile politicians have used Twitter to proclaim the benefits of Premier League football.
Welsh Government Regeneration Minister Huw Lewis said: "Well done to Swansea! Great news for the whole of Wales."
Shadow Welsh Secretary Peter Hain said the "whole country will reap the benefit of top flight football coming to Wales"