In the UK, the free Wi-Fi that visitors can rely on is mostly at airports and in hotels. Heathrow and Gatwick both offer free Wi-Fi across their terminals. By contrast, Wi-Fi at London Underground stations is designed for customers of UK mobile networks, who connect automatically, and Transport for London (TfL) gives no route in for visitors. Mobile 4G and 5G now reach more and more Tube tunnels, but on-board Wi-Fi on long-distance trains performed well just 1% of the time in tests by the regulator Ofcom. Drawing on official information from the airports, TfL, Ofcom and the UK government, this guide explains where Wi-Fi in the UK is dependable and what connectivity on the move is really like.
If you want your own connection after you leave the airport, including on the Tube and on trains, you can set up a UK eSIM before you travel. See the Coral eSIM plans for the UK and pick the data allowance that fits your trip.
Internet in the UK: airports and accommodation are where Wi-Fi works
Fixed broadband in the UK is well developed. Ofcom's spring 2026 update (a January 2026 snapshot) found that 82% of homes can get full fibre and 89% can get gigabit-capable broadband. Ookla's figures for August 2026 (medians) put fixed broadband at 184.24 Mbps down, so the connection behind hotel and holiday-let Wi-Fi is generally solid.
Mobile, by contrast, has a median of 74.99 Mbps down, 9.04 Mbps up and 31 ms latency, ranking 61st in the world. That is plenty for maps, ride-hailing and messaging, but slower than fixed lines. By location, the picture looks like this:
- Airports: Heathrow and Gatwick both have free Wi-Fi that visitors can use after registering
- Hotels and rentals: strong fixed broadband makes them the place for heavy downloads
- London Underground stations: Wi-Fi is built around UK mobile network customers
- Long-distance trains: on-board Wi-Fi varies by train company and rarely performs well in tests
How to connect to free Wi-Fi at Heathrow and Gatwick airports
Heathrow Airport
According to Heathrow's official site, free Wi-Fi is available in every terminal. Choose "Heathrow Wi-Fi" from the list of networks, follow the on-screen instructions and register to start using it. If the login page does not open automatically, the airport's troubleshooting guide says that opening www.heathrow.com in your browser will redirect you to the login page. Every terminal also has free internet kiosks for anyone without a phone or laptop.
Gatwick Airport
At Gatwick, select "Free Gatwick Wi-Fi Vinci Airports", choose "Free Superfast Wi-Fi" and enter an email address to get free, unlimited Wi-Fi at up to 50 Mbps. Signing up for the airport's free myGatwick account unlocks speeds of up to 100 Mbps. A paid Premium Wi-Fi option also exists, but the free service is enough for social media and email.
Airport Wi-Fi is content-filtered
Heathrow's Wi-Fi is certified by Friendly WiFi and filters out content unsuitable for children. Both airports require a short sign-up, but either will do for messages right after arrival. Once you leave the airport, though, you will need your own connection rather than Wi-Fi.
London Underground station Wi-Fi is for UK mobile customers
TfL says Wi-Fi is available at all Tube stations, most London Overground stations, all Elizabeth line stations in central London and Victoria Coach Station. The way it works, however, is that your phone joins the Wi-Fi service run by your own mobile network. The network names TfL lists are:
- EE WiFi-Auto (EE)
- Wifi Extra (O2)
- Three_WIFI (Three)
- VodafoneWiFi (Vodafone)
- The Cloud (at 81 London Overground stations)
TfL tells users to contact their mobile network operator with questions about connecting, and it does not describe any way for people without a UK mobile contract to use station Wi-Fi. Station Wi-Fi also has no signal in the tunnels, so it drops until the next station. Visitors from abroad are better off planning as if station Wi-Fi does not exist.
More of the London Underground now has 4G and 5G on board
What is spreading instead of Wi-Fi is mobile signal underground. TfL says 50% of below-ground Tube stations now have mobile signal, every Elizabeth line station has 4G and its tunnel sections have both 4G and 5G. Many central sections have signal in both stations and tunnels, including the Central line from Shepherd's Bush to Bank, the Jubilee line from Westminster to Canning Town, and the Victoria line from Brixton to Green Park (with one tunnel still to go live).
TfL explains that a 4G- or 5G-compatible phone connects automatically, just as above ground, with no app or special settings. Any charges are down to your mobile service, not TfL. Ookla's analysis (September 2026) found that underground connections included international visitors roaming onto UK networks. In other words, a travel eSIM that connects to a UK network lets you use maps and journey planners on board on a growing share of the Tube.
Note that the UK has already switched off 3G, so older phones without 4G will not connect. For device and network requirements, see our guide to buying a SIM card in the UK.
Wi-Fi on UK trains is unreliable, Ofcom research shows
National Rail says many train companies offer on-board Wi-Fi and power sockets, but charges and availability vary by train company. And the real-world quality falls well short of what most travellers expect.
In research published in June 2026, Ofcom measured connectivity across 24 segments of key railway lines in England, Scotland and Wales. It defined good performance as at least 5 Mbps down, 1.5 Mbps up and a response time of 50 ms or less, enough for video calls, streaming and social media.
- On-board Wi-Fi provided by train companies performed well just 1% of the time, largely because of outdated technology and speed caps
- Mobile networks met the standard on 42% of segments for EE, 21% for Three, 20% for O2 and 17% for Vodafone
- Depending on the network, performance was poor in 58% to 83% of tests
Ofcom puts this down to weak signal from ground-based masts along railway lines and to carriage types that signals struggle to pass through. The UK government is tackling signal blackspots in 57 rail tunnels (almost 50 km) and upgrading 4G and 5G at 12 major stations, with installation starting in 2026 and completion expected by 2028. Until then, save maps, tickets and booking details to your phone before you board. Our guide to using maps offline shows how.
Using free Wi-Fi in the UK safely: the NCSC's view
The UK's National Cyber Security Centre (NCSC) says a private Wi-Fi network protected by WPA2 is more secure than public Wi-Fi such as you find in a coffee shop or hotel. It also stresses that services involving logins or card details should be encrypted with HTTPS, shown as a padlock in your browser.
There is a catch if you use a VPN. The NCSC notes that forcing all traffic through a VPN can stop public Wi-Fi login pages (captive portals) from appearing. When joining airport or hotel Wi-Fi, complete the login page first and then turn the VPN on.
The simplest precaution for travellers is to avoid online banking, card payments and account logins on public Wi-Fi, and to switch to your own mobile data for them. Our guide to free Wi-Fi security covers this in more detail.
Internet in the UK: frequently asked questions
Is there free Wi-Fi at UK airports?
Yes. At Heathrow, register on "Heathrow Wi-Fi" in any terminal. At Gatwick, join "Free Gatwick Wi-Fi Vinci Airports" and enter an email address for up to 50 Mbps. If the login page does not appear, opening the airport's website in your browser brings it up.
Can visitors use Wi-Fi at London Underground stations?
TfL describes station Wi-Fi as a service that EE, O2, Three and Vodafone customers join automatically through their network's Wi-Fi, and it gives no method for visitors. There is also no station Wi-Fi signal in the tunnels, so it is safer not to count on it.
Does my phone work on London Underground trains?
On many central sections, 4G and 5G reach both stations and tunnels. Half of below-ground stations have signal, and every Elizabeth line station has 4G. With a 4G- or 5G-compatible phone connected to a UK network, it works without any special settings.
Can I use Wi-Fi on UK trains?
Many train companies offer it, but charges and availability vary. In Ofcom's 2026 research, on-board Wi-Fi performed well in just 1% of measurements. Save what you need to your phone before boarding.
Is it safe to do online banking on hotel or café Wi-Fi in the UK?
It is not recommended. The NCSC says public Wi-Fi in cafés and hotels is less secure than a private network. Switch to your own mobile data for online banking and card payments.
In the UK, use Wi-Fi at the airport and your accommodation, and your own connection on the move
Airport and hotel Wi-Fi in the UK is easy to use, and fast fixed broadband means big downloads and streaming can wait until you are back at your accommodation. London Tube station Wi-Fi, however, is built for UK mobile customers, and on-board Wi-Fi on long-distance trains rarely performs well in tests. At the same time, 4G and 5G now reach a growing share of Tube tunnels. Use Wi-Fi at the airport and where you stay, and rely on your own eSIM connected to a UK network while travelling on the Tube and trains. That is the least stressful way to stay connected in the UK.
See the Coral eSIM plans for the UK, or browse plans for other countries in the full plan list.
