---
title: "Southwest at ATL: Domestic Terminal check"
description: "Southwest checks in at ATL's Domestic Terminal and boards from Concourse C. Its ticket counter opens 120 minutes before the first departure of the day."
url: "https://atlairportguide.com/guides/southwest-at-atlanta-airport-check-concourse/"
updated: "2026-11-15"
airport: "ATL"
type: "guide"
---

> Independent guide, not the official ATL website. All pages: https://atlairportguide.com/llms.txt

# Southwest at ATL: Domestic Terminal check-in and Concourse C gates

Southwest checks in at ATL's Domestic Terminal and boards from Concourse C. Its ticket counter opens 120 minutes before the first departure of the day.

Published November 15, 2026

![The gate hall of Concourse C at Atlanta airport, with a steel column, a bin, rows of dark seats and a long pale walkway.](https://atlairportguide.com/images/atl/concourse-c-gate-6-southwest-v9.webp)

Concourse C gate hall

You check [Southwest](https://atlairportguide.com/airlines/southwest/) in at the Domestic Terminal and board in Concourse C, a separate building out on the airfield. Southwest’s Atlanta entry says its ticket counter opens 120 minutes before the first departing flight, every day of the week, and suggests arriving 120 minutes ahead of a domestic or an international flight.

## Check in at the Domestic Terminal

That terminal has a [North](https://atlairportguide.com/venues/north-ticketing-check-in/) and a [South](https://atlairportguide.com/venues/south-ticketing-check-in/) ticketing area, and Southwest’s entry names neither.

If the side matters to you, ask a Customer Experience Representative at the Domestic Terminal’s west crossover. You can also call Southwest on the (800) 435-9792 that ATL’s airlines page lists.

Southwest lists a priority lane, an express lane and self-tagging at ATL, and doesn’t say where in the terminal they are. Its entry gives an opening time for the counter but no closing time or bag cutoff, so ask Southwest if you’re cutting it close.

Flying out of the country on Southwest? Southwest’s airport information page says you must verify your passport with an agent or kiosk at the ticket counter at least 60 minutes before departure. The note covers every Southwest airport, and the Atlanta entry has no passport text of its own.

## Concourse C and the ride there

Southwest’s gates are a train ride from the terminal. Once you’re through the Domestic Terminal’s security, the Plane Train takes you to Concourse C. Our [Plane Train guide](https://atlairportguide.com/guides/plane-train-walking-between-atl-concourses/) gives the wait between trains.

Southwest uses gates C1 to C22 except C8, C11, C18 and C19. A gate above C22 isn’t on that list, so confirm it with Southwest before you walk there. ATL’s flight search says to confirm gate assignments with your airline, and our [flights page](https://atlairportguide.com/flights/) links each airline’s page but shows no live gates.

Southwest counts two times from the gate:

- Boarding can begin as early as 30 minutes before departure.
- You need your boarding pass and a place in the gate area at least 10 minutes before departure, or Southwest may cancel your reserved space and owe you no denied boarding compensation.

Both clocks are measured at the gate, so security and the train ride come out of your own time.

If you’re connecting from another airline, the letter in your Southwest gate number names your concourse. Our guide to [which concourse your airline uses](https://atlairportguide.com/guides/which-concourse-my-airline-at-atl/) explains how the letters work.

## After you land in Concourse C

You arrive in Concourse C, and the Plane Train also takes arriving passengers to baggage claim. The Domestic Terminal has a [North baggage claim](https://atlairportguide.com/venues/north-baggage-claim/) and a [South baggage claim](https://atlairportguide.com/venues/south-baggage-claim/). Southwest’s entry doesn’t say which one your flight uses, so ask Southwest before you pick a side.

MARTA’s Airport Station sits at the west end of the Domestic Terminal, between the two baggage claims. Our [MARTA rail page](https://atlairportguide.com/transport/marta-rail/) has the fares, and our [guide to MARTA from the airport](https://atlairportguide.com/guides/marta-from-atlanta-airport-fares-stops-last-train/) has the stops and the last train.

### Sources

- Our [Southwest page](https://atlairportguide.com/airlines/southwest/), [terminal map](https://atlairportguide.com/terminals/terminal/), [North ticketing page](https://atlairportguide.com/venues/north-ticketing-check-in/), [South ticketing page](https://atlairportguide.com/venues/south-ticketing-check-in/), [MARTA rail page](https://atlairportguide.com/transport/marta-rail/), [MARTA guide](https://atlairportguide.com/guides/marta-from-atlanta-airport-fares-stops-last-train/) and [Plane Train guide](https://atlairportguide.com/guides/plane-train-walking-between-atl-concourses/)
- ATL’s flight search, plus ATL’s airline directory and Plane Train story
- Southwest’s Atlanta airport information and its check-in page