Heathrow airlines by terminal: the full lookup with edge cases

Airlines at Heathrow are arranged primarily by airline alliance. Each terminal anchors on a different group of carriers, with a handful of exceptions worth flagging up front. As a heuristic for the most common case:

• Terminal 2 (the Queen's Terminal) is the Star Alliance hub. Lufthansa, United Airlines, Singapore Airlines, ANA, Air Canada, Air India, Swiss, Austrian, Brussels Airlines, TAP Air Portugal, LOT Polish, Turkish Airlines, SAS, and the rest of the Star roster fly from here.
• Terminal 3 hosts most of oneworld (American Airlines, Cathay Pacific, Finnair, Japan Airlines, Qantas, Royal Jordanian, SriLankan) plus the oneworld newcomer Alaska Airlines, plus the SkyTeam pair Virgin Atlantic and Delta (co-located by joint venture), plus the non-aligned long-haul names Emirates, Kenya Airways, and Air Mauritius.
• Terminal 4 is the SkyTeam base for the European and Asian SkyTeam carriers (Air France, KLM, Korean Air, China Eastern, China Southern, Vietnam Airlines, Saudia), plus the Gulf and Asia long-haul names that sit outside the three main alliances (Qatar Airways, Etihad Airways, Malaysia Airlines, Royal Brunei, Royal Air Maroc, Bulgaria Air, Pakistan International Airlines, Vueling).
• Terminal 5 is British Airways and Iberia only, plus Iberia Express, all three IAG group carriers.

The heuristic gets you to the right terminal for the majority of flights, but four edge cases break it and they all matter. Aer Lingus is at T2 despite being a full oneworld member since 1 April 2025, because the IAG-owned carrier predates the oneworld terminal shuffle and Heathrow has not moved it. ITA Airways is at T2 from 29 March 2026, ahead of joining Star Alliance on 1 April 2026; older guides will still list it at T4 with the SkyTeam carriers. Virgin Atlantic is at T3 despite being the UK's first SkyTeam member, kept there by its joint venture with Delta and a flagship lounge it has owned for decades. Codeshare flights depart from the operating carrier's terminal, not the marketing carrier's; a BA-numbered flight operated by Aer Lingus leaves from T2, not T5.

The rest of this page gives the per-terminal lookup tables for the actual flight day. For the reverse lookup (you have a flight number, you want the terminal), see which terminal does my airline use. For the broader terminal context, see the Heathrow terminals overview.

Around 25 carriers operate from T2, almost all of them Star Alliance members. The check-in zones group the carriers by alliance partnership: zone A for Aer Lingus and Air Canada, zone B for the Lufthansa group, zone C for United and LOT Polish, zone D for the Asia-Pacific Star carriers, zone E for the rest.

Three lines on the T2 edge cases for clarity. Aer Lingus rejoined oneworld as a full member on 1 April 2025 after 18 years outside the alliance, but Heathrow did not move it to T3 with the other oneworld carriers; it remains at T2 alongside the Star Alliance roster because of the IAG ownership arrangement and the deep partner integration already in place at the terminal. ITA Airways began operating from T2 on 29 March 2026 (start of the summer schedule) ahead of joining Star Alliance on 1 April 2026 as the alliance's 26th member; older guides may still list it at T4 from its SkyTeam years. SAS joined SkyTeam in September 2024 but stayed at T2 rather than moving to T4.

About 18 carriers operate from T3: most of the oneworld alliance, the SkyTeam pair Virgin Atlantic and Delta (co-located by joint venture), and a handful of non-aligned long-haul names. Virgin's check-in is in zone A with the Upper Class Wing separately accessible; American Airlines uses zone J; the other carriers spread across zones B to H.

Virgin Atlantic at T3 is the loudest edge case on this page. Virgin joined SkyTeam in March 2023 as the alliance's first and only UK member, but Heathrow kept Virgin at T3 rather than moving it to T4 with Air France, KLM, and Korean Air. The reason is the Delta joint venture: Delta owns about 49% of Virgin Atlantic, the two airlines coordinate transatlantic schedules and revenue share, and they share the T3 check-in area, the Virgin Clubhouse lounge, and the Upper Class Wing. Delta moved all its Heathrow flights to T3 to match. For most passengers booking a SkyTeam carrier, T4 is still the right answer; for Virgin, Delta, China Airlines, and Kenya Airways, T3 is the right answer.

Alaska Airlines became Heathrow's 14th oneworld carrier when it began Seattle service on 22 May 2026, bringing the deepest oneworld presence of any global hub. Emirates remains the highest-volume non-aligned T3 carrier with multiple daily Dubai services including the A380.

About 34 carriers operate from T4: the SkyTeam alliance carriers (other than the Virgin/Delta pair at T3 and the carriers that stayed at T2), plus a cluster of Gulf and Asia long-haul names outside the three main alliances. T4 sits south of the runways with its own access road and station; Heathrow Express does not stop at T4, which is the most common operational gotcha. Direct rail to T4 is the Elizabeth Line or the Piccadilly Line.

Two quirks worth flagging on T4. Qatar Airways, Malaysia Airlines, and Royal Air Maroc are oneworld members but operate from T4 rather than T3, by historic operational arrangement that predates the alliance shuffle. Vueling is part of the IAG group along with British Airways and Iberia (both at T5) and Aer Lingus (at T2), but operates its Heathrow-to-Seville service from T4, making IAG the only group split across three Heathrow terminals.

T5 is exclusively the IAG group's terminal at Heathrow, with three carriers and no third-party traffic. The terminal handles the largest passenger volume at the airport at around 35 million a year, the bulk of it British Airways long-haul and short-haul.

Two practical notes on T5 not covered by the lookup itself. Short-haul BA flights to Europe often depart from one of the two airside satellite buildings, T5B or T5C, reached by a free underground transit train from the airside concourse of the main building, every three to four minutes. The gate letter on the boarding pass tells you which building: A gates are in the main building, B gates are in T5B, C gates are in T5C. Inbound passengers always clear immigration and collect baggage in the main T5 building regardless of which satellite the aircraft uses.

British Airways domestic flights to Edinburgh, Glasgow, Aberdeen, Manchester, Newcastle, and Belfast leave from T5 alongside the long-haul departures, with no separate domestic terminal at Heathrow. Domestic arrivals skip UK Border Force passport control and walk straight to baggage reclaim.

Almost every airline at Heathrow operates from a single terminal, but a small number of groups split across two or more. The clearest example is the IAG group, which spreads across three terminals: British Airways, Iberia, and Iberia Express at T5, Aer Lingus at T2, and Vueling at T4. IAG is the parent of all five carriers, but operational integration (check-in zones, gate allocation, baggage handling) is per terminal rather than per group, so a connection between two IAG carriers in different terminals uses the same inter-terminal transfer as any other cross-terminal connection.

Lufthansa Group presents a smaller split. Lufthansa, Austrian, Brussels Airlines, Swiss, and ITA Airways (from spring 2026) all operate from T2. Eurowings, the group's budget arm, also operates from T2 but as a non-aligned carrier without the alliance frequent-flyer reciprocity. Discover Airlines and Air Dolomiti, the group's smaller carriers, do not currently fly to Heathrow.

SkyTeam at Heathrow is split between T3 and T4 by joint venture rather than by airline. Virgin Atlantic, Delta, China Airlines, and Kenya Airways are at T3 because of the Virgin/Delta joint venture and Virgin's long-standing T3 home. Air France, KLM, Korean Air, Saudia, China Eastern, Vietnam Airlines, and Garuda Indonesia are at T4 with the rest of the alliance. SAS and MEA are SkyTeam members but stayed at T2.

Individual carriers very rarely run flights from more than one terminal in the same day at Heathrow. Where a group route shows two different terminals on the same airline code, the second is almost always a codeshare; see the next section.

A codeshare flight has two airline names on it: the marketing carrier whose flight number is on the ticket, and the operating carrier that actually flies the aircraft. The terminal is set by the operating carrier, not the marketing carrier. This is the single most common reason a traveller ends up at the wrong Heathrow terminal.

Concrete example: a flight sold as British Airways BA8985 from Heathrow to Dublin is operated by Aer Lingus, not by BA. Even though the ticket carries a BA flight number, the operating carrier is Aer Lingus, and the flight departs from Terminal 2 (where Aer Lingus operates), not Terminal 5 (where BA's own flights leave). The same goes the other way: an Aer Lingus-marketed codeshare operated by BA leaves from T5, not T2.

How to read your booking. Most airline confirmation emails name the operating carrier in the small print under the flight number: "BA8985 operated by Aer Lingus EI154". The manage-my-booking page on the marketing carrier's site usually shows the operating carrier and the terminal. The live departures board lists flights by the operating carrier and the terminal they leave from; on the day itself, Heathrow's own board at heathrow.com is the canonical operational source.

Other examples worth knowing about. Virgin Atlantic codeshares operated by Delta leave from T3 (both at T3). Some BA codeshares operated by American Airlines on the transatlantic joint venture leave from T3 (American is at T3) rather than T5. SkyTeam codeshares between Air France or KLM and a Virgin Atlantic operated flight leave from T3.

Five things to try if your airline is not in the per-terminal tables above.

1. Check the operating carrier on your booking. If the flight number on your ticket is one airline but the small print says "operated by" another, the operating carrier sets the terminal.
2. Use the reverse lookup at which terminal does my airline use, which takes a flight number or airline name as the input.
3. Check the live departures board (or arrivals for inbound), which lists the coming hours by airline and terminal; heathrow.com carries the airport's own board for the full 24 hours.
4. Use your airline's own manage-my-booking page with the booking reference; the terminal is shown there.
5. For new or seasonal routes that started recently, the airline's press release or its Heathrow-specific airport guide page is the safest source. Spring 2026 saw four new or returning Heathrow services (ITA Airways at T2, PIA at T4, Vueling at T4, Alaska Airlines at T3), all of which take time to filter into general travel guides.

If the flight is still not findable, the most likely reasons are a charter or private aircraft (not on the public flight board), a flight from London Stansted or Gatwick mistakenly searched for as Heathrow, or a name change after a merger or rebrand. The Heathrow flight destinations page covers what flies where; the flight booking page covers the practical booking questions. To reach an airline rather than find its terminal, see Heathrow airline contacts.