Holidaymakers are jetting out of the country as a ban on overseas leisure travel is lifted.
Thousands of people are expected to take to the skies as travel restrictions are eased in England and Wales on Monday.
The relaxation of the rules was described as a "symbolic moment after the most difficult year in our history", by one airports chief.
Travel firms have reported a surge in demand for trips to Portugal, after the Government put the country on its green list for travel meaning travellers will not need to self-isolate on their return, and are only required to take one post-arrival test.
Only a dozen countries and territories are on the green list but most are either remote islands or do not currently allow UK tourists to enter.
Here's the latest travel updates from Tui, easyJet, Ryanair, BA and Jet2
EasyJet has added 105,000 extra seats to its flights serving green-tier destination.
They have resumed flights to Portugal, Iceland, Israel and Gibraltar.
EasyJet said: "Holidays to green destinations can go ahead.
"You’ll just need to make sure you follow all the steps required by the government for your return.
"Remember, this could change between booking and travel, so make sure to keep checking the government website for the latest updates – we recommend signing up for their email alerts, should anything change.
"Holidays to ‘amber’ destinations can go ahead if you’re happy to travel and follow the re-entry steps set out by the government."
They are also offering additional flexibility where holidays are affected by the government traffic light system or restrictions in destination.
All holidays can be changed, fee free, up to 28 days before travel.
Tui will use aircrafts which normally operate long-haul routes to accommodate the surge of people booked to fly to Portugal.
The airline said it will operate holidays to the Algarve, Madeira and Porto Santo.
Flights to amber list destinations including Crete, Kos and Rhodes will operate as planned.
TUI will only be flying from a few airports between May 17 and 27 – Manchester Airport, Gatwick Airport, Birmingham Airport and Bristol Airport.
In its latest update, TUI added: "All Red destinations and Amber destinations where the government advise against all but essential travel, are cancelled up to and including 6 June 2021."
Ryanair will fly to the Algarve, Lisbon and Porto this summer.
They have launched a seat sale with fares available from £19.99 for travel until the end of October 2021.
The budget airline has added 175,000 extra seats to Portugal for this summer.
Ryanair’s Director of Marketing, Dara Brady, said: “We are very pleased to announce 175,000 extra seats to Portugal on the back of the UK’s green list.
"With quarantine-free travel now permitted to the likes of Faro, Lisbon and Porto, even more flights have been added to our UK schedule in order to meet the demand from our customers.
"The UK Summer 2021 schedule comprises 480 destinations, having recently launched 26 new routes and with more to be added as restrictions relax throughout Europe over the summer months.
"UK families can book a well-earned summer holiday safe in the knowledge that if their plans change, they can move their travel dates up to two times with a zero-change fee up until the end of October 2021."
British Airways has added new services to holiday destinations for June and July onwards, saying the new services are in response to overwhelming interest from its customers on its website, ba.com.
The 26 additional weekly frequencies will include destinations across Greece, the Canary Islands and Turkey to popular holiday hot spots including Corfu, Kos, Paphos, Rhodes, Lanzarote, Tenerife and Bodrum.
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British Airways is currently flying to 27 short-haul destinations, including 112 holiday hotspots for the peak of the summer period.
Chairman and CEO Sean Doyle said: "We're pleased that our customers are able to start travelling again to some countries, including Portugal, and we've put on additional flights from London, Manchester, Newcastle and Edinburgh to Faro to help people get moving."
Jet2 is not starting their holiday and flight programme until June 24.
They said: "We’re taking the time to get everything ready at our airports, onboard our planes and in our resorts to give you the safest and smoothest holiday experience possible.
"Our teams both in the UK and overseas can’t wait to welcome you back – we’re excited to give you the holiday you deserve.
"If your booking is affected in any way, we’ll be in touch with you as soon as we can. We kindly ask you to hold off from contacting us and wait for us to get in touch with more details.
"Please visit our website 14 days before you’re due to depart, when we’ll have all the latest official information.
"Between now and then, there’s no need to take any action – and we’d recommend that you don’t start arranging things like Covid-19 tests until closer to your time of travel, as travel requirements both here and abroad can change."