Last-Minute Flights from Chicago O'Hare

Airlines do not mark prices up on a calendar day. They sell seats in groups of fare levels, and as a flight fills, the cheaper levels close. In the final two weeks, the seats that remain are usually the expensive ones, and they are priced for business travelers who have no choice about the date.

That is why a flight that cost $140 a month ago can cost $380 five days before departure. It is not a penalty for being late, it is simply what is left. The exception is a flight that has not sold well, where an airline will sometimes cut prices close in to fill it, and that is where the good last-minute deals come from.

O'Hare (ORD) is the bigger of the two, with a huge range of domestic and international flights. The CTA Blue Line runs to the airport from downtown in around 45 minutes and costs a few dollars, and the Metra and the highway connect from the suburbs.

Midway (MDW) is smaller, easier and closer to downtown, with the Orange Line running to the terminal. It is often the better choice for a quick domestic trip, especially on Southwest, and its security lines are usually shorter. Compare both airports on every search. Our O'Hare airport guide covers the terminals and transport in detail.

The most common last-minute trips from Chicago are to Florida, particularly Orlando, Tampa and Miami, to Las Vegas, Phoenix and Los Angeles, to New York and Washington, and to Denver and Minneapolis. In winter, people head for warm places, and in summer they head for the coast or the mountains.

Nashville, New Orleans and Austin are weekend favorites, and Cancun and the Caribbean attract the more adventurous. For any of these, check both Chicago airports and look at one-way tickets on different airlines, since a mixed combination is often cheaper.

If you are already holding a ticket and need to leave earlier or later on the day of travel, several big airlines allow same-day changes or standby, but the rules and fees depend on the airline, the fare and your status. Basic fares are usually excluded.

Check the airline's current policy before you rely on it, and use the app, which often shows the options and fees clearly. It is not a reason to buy a ticket you do not need, but it can rescue a trip when plans shift at the last minute.

Most budget traffic in Chicago is at Midway, where Southwest is the largest carrier. Frontier and a few other low-cost carriers also fly from O'Hare and Midway to leisure destinations, and their route maps change from season to season.

Low base fares can look attractive on short notice, but check the total with bags and seat selection, since those add up. Some budget airlines have also been through financial restructuring in recent years, so it is worth checking an airline's current schedule before booking a trip that is far in the future. Our guide to budget airlines and legacy carriers explains the trade-offs.

Since May 2025, domestic travelers need a Real ID-compliant driver's license or another accepted document, such as a passport, to board a flight. If your license is not compliant, bring a passport or another accepted ID.

For an international last-minute trip, check passport validity, visa and electronic travel authorization rules before you buy, since some can take days to process. Our guide to Real ID requirements explains what you need.

Chicago's winters can bring snow, ice and strong winds, and de-icing and ground stops can cause delays and cancellations across the whole network. Spring and summer storms are also common.

On a last-minute trip, you do not have much slack, so check the forecast, choose a morning flight, and avoid a very tight connection. If your flight is cancelled, rebook through the airline's app straight away. You can read what you are entitled to in our guide to delay and cancellation rights.

Last-minute first-class fares on domestic flights are almost always very expensive, but upgrades can be cheaper, and some airlines offer paid upgrades at check-in or at the gate for a modest fee. International business class is rarely cheap at short notice, though sales and premium economy can offer a middle path.

Chicago's hubs also have lounges and generous schedules for premium passengers. If you want to explore options, our business class flights guide sets out the main routes and what each cabin offers.

One of the benefits of flying out of a hub is that if a flight is cancelled, there are usually other options the same day. United and American each operate dozens of flights from O'Hare to major cities, so rebooking is easier than at a small airport.

Use the airline's app to check alternatives as soon as you hear of a delay, since seats go quickly. If you have a connection, look at the next flight before you get to the gate. A few minutes of preparation can save a night in a hotel.

If you tell us where you want to go and how flexible you can be, one of our specialists can compare both Chicago airports, check several days either side, and find the best fare available. We can add a hotel or a car if that helps.

You can also search live fares below. If a price looks good, call us to check the baggage rules and fare conditions before you buy, since a last-minute decision benefits from a second pair of eyes.