The Essential Guide To Chicago City Airport Code Mdw Decoded

Understanding Chicago Midway Airport Code MDW

The IATA code MDW stands for Chicago Midway International Airport, which sits on the Southwest Side of Chicago in the Ashburn neighborhood. Most people who fly out of Chicago assume O'Hare (ORD) is the only option, but Midway handles several million passengers each year, mostly on Southwest. The code assignment itself comes straight from the airport's former name, Midway Airport, when it received its IATA designation back in the late 1940s. I've spent more time than I care to admit helping people sort through Chicago airport confusion, and the number one issue I see is people booking flights to MDW when they actually need ORD, or vice versa. The two airports are about 17 miles apart. A ride-share between them can take anywhere from 35 minutes to over an hour depending on traffic and weather. If you land at Midway and have a connecting flight departing from O'Hare, you need to budget at least two hours for the transfer, plus the time for baggage recheck if your bags aren't through-checked. The MDW code is assigned by the International Air Transport Association. It's a three-letter code that appears on your boarding pass, your baggage tag, and in airline reservation systems. When you're looking at flight options, make sure the code next to your departure and arrival says MDW and not ORD. One mistake I've helped fix multiple times involved a traveler who booked a flight arriving at MDW assuming it was O'Hare, then realized too late that his hotel shuttle only services the ORD terminals. He ended up taking a bus from the Midway CTA station to the Blue Line, then transferring to the Red or Brown Line depending on where he needed to go. That trip cost him about two hours and $22 in rideshare fare he didn't need to spend.

Midway is served by the CTA Blue Line, which runs directly from the airport terminal to downtown Chicago in roughly 40 to 50 minutes. The station is connected to the terminal via a covered walkway. It's one of the more straightforward airport transit connections in the US, which is why I always tell people staying in downtown Chicago to consider Midway as a legitimate option instead of defaulting to O'Hare. The terminal itself has one main building with concourses A and B. There's no sky train between concourses like at ORD. You walk. Both concourses connect to the same security checkpoint area, so once you're through TSA, you're in the same climate-controlled space regardless of which gate you need. That said, some gates at Midway are older and don't have jet bridges. You'll board via stairs or a portable gangway in those cases. Don't complain about it on the internet, but do wear shoes you can walk in quickly if your gate requires it. A counter-intuitive thing about MDW that most people don't realize: the airport's elevation and runway orientation make it significantly more wind-delay sensitive than O'Hare. Midway sits at approximately 620 feet above sea level with runways that align roughly north-south. When wind shifts to a crosswind component, especially in winter when lake-effect patterns create unpredictable gusts, Midway can close runways while O'Hare keeps operating with its longer parallel runways. I've seen flights diverted from MDW to ORD during a single afternoon in January because the crosswind exceeded the aircraft operator's limits. If you're flying through Midway in winter and your flight is canceled, check whether it was actually diverted rather than simply delayed. Diversions often mean the plane already went to an alternate airport, which changes your rebooking options considerably.

Southwest operates the vast majority of flights from Midway. They have a hub here, which means their system handles connections better than carriers that use MDW as a smaller focus city. If you're booking a multi-city trip through Midway, stick with Southwest or a partner airline if you want the smoothest experience. Codeshare connections on other carriers through MDW tend to have tighter turn times and less baggage coordination compared to a full-service hub airport. Another thing nobody warns you about: the parking situation at Midway. The official airport parking lots fill up faster than you'd expect, especially on holiday weekends. The economy lot is a shuttle ride away. I recommend using the off-site parking garages on 53rd Street near the airport. They typically charge between $8 and $14 per day compared to the airport's $9 to $26 rate, and the shuttle pickup is right at the terminal curb. I've been doing this for years and it saves me about forty dollars per trip without adding any meaningful time. If you're looking for the actual airport code to use in your travel bookings or luggage labels, it's MDW. Write it exactly like that. Capital letters, no spaces. Some older reservation systems from the early 2000s had trouble parsing it if you typed it in lowercase, but every modern system handles it fine. Just don't write it as "MDW-" or "Mdw" or any variation with hyphens or mixed casing. The code is three uppercase characters and nothing else.