Airline guide for Pittsburgh International Airport
Pittsburgh International Airport’s official directory lists 15 scheduled carriers plus vacation-charter marketers, with Southwest Airlines the largest operator (25.8% of passengers) and American, Delta and United close behind. All ticketing happens in the Landside Terminal; gates are letters A through D in the Airside Terminal.
At a glance
- Southwest Airlines — the airport’s largest carrier (25.8% of traffic): a broad domestic network plus seasonal Cancún, Miami and beach destinations.
- American Airlines (with American Eagle) — second largest (23.0%): hubs toward Charlotte, Dallas/Fort Worth, Philadelphia, Miami and more; curbside check-in at the terminal.
- Delta Air Lines (with Delta Connection) — third (16.5%): Atlanta, Minneapolis/St. Paul, Salt Lake City and northeast shuttles.
- United Airlines (with United Express) — fourth (15.3%): Chicago O’Hare, Denver, Houston, Los Angeles, San Francisco.
- Allegiant Air — leisure routes from its PIT operating base to Florida and sun destinations.
- International — British Airways (London Heathrow year-round), Aer Lingus (Dublin, new for 2026), Air Canada (Toronto year-round, Montréal seasonal) and Icelandair (seasonal Reykjavík).
- Others — Alaska (Seattle), Breeze, Frontier, JetBlue, Sun Country and Southern Airways Express (regional; Bradford and DuBois services end 31 January 2027).
Where to go
| If you fly… | Check-in | Concourse |
|---|---|---|
| Any airline | Landside Terminal, departures level (curbside check-in for American) | See your boarding pass — gates are lettered A–D; international arrivals use C |
| Shuttle / regional (Southern Airways) | Landside Terminal | Check your boarding pass |
| Charter vacations (Apple Vacations, Vacation Express) | Landside Terminal, per operator | Per operator |
Where the airlines fly
In its latest counts the airport served more than 60 nonstop destinations: 58 US airports plus Dublin, London-Heathrow, Toronto, Montréal, Reykjavík, Cancún and Punta Cana (some seasonal). Busiest routes: Atlanta, Chicago O’Hare, Orlando, Charlotte and Denver; the top international markets are London, Toronto and Reykjavík.
Good to know
- Concourse assignments can change — trust the gate on your boarding pass and the screens in the centre core.
- The transformation programme is reconfiguring A and B concourse gates; follow overhead signage.
- Live checkpoint wait times are published on the airport’s website before you leave home.
Full phone numbers and the tile grid for every carrier are on the airlines page and the airline contacts page.