Layover in Chicago O'Hare ORD: what to do hour by hour

3 hours: stay airside, eat well

Three hours at O'Hare is comfortable as long as you do not change terminals through security. Budget the first 30 minutes for deplaning and finding your next gate. If you are anywhere in Terminals 1 to 3, that leaves a clean two hours of free movement before boarding.

Spend it on food, because O'Hare does airport food better than most American hubs. Tortas Frontera, the Rick Bayless torta and guacamole counter, has locations in Terminal 1 near gate B11 and Terminal 3 near gate K4, open from 5am to about 9pm. The line moves fast and it beats anything else in the building. If you are in Terminal 1, walk the underground tunnel between concourses B and C for the neon light installation overhead. It costs nothing and kills 15 minutes.

Arriving internationally into Terminal 5 with a 3 hour connection is a different story. You will clear immigration, collect any checked bag, recheck it at the counters directly outside the customs hall, then ride to your departure terminal and clear security. Off peak that chain takes about an hour. During the afternoon arrival bank from Europe it can swallow two hours or more, and your three hour layover becomes a brisk walk. Skip the sightseeing and go straight to your gate.

5 hours: lounge, stretch, reset

Five hours buys breathing room. This is lounge territory, and the honest picture is that O'Hare is an airline lounge airport. United Club locations cluster in Terminals 1 and 2, American's Admirals Club and Flagship lounges sit in Terminal 3, and access runs through class of travel, status or membership. The one independent lounge that takes Priority Pass is the Swissport Lounge in Terminal 5 near gate M15, and it restricts walk in access during the 3pm to 8:30pm international departure rush. The full picture, including paid entry options, is in the ORD lounge directory.

No lounge access, no problem. The free yoga room on the mezzanine of the Terminal 3 rotunda is open from 6am to 10pm with mats provided, and a quiet 30 minutes there does more for a long travel day than a third coffee. Then take the slow loop on foot: Terminal 1 to Terminal 3 and back is about 40 minutes of actual walking, which is exactly what your back wants four hours before another flight.

8 hours: downtown is on the table

Eight hours is enough for the Loop, with discipline. The CTA Blue Line leaves from beneath the parking garage serving Terminals 1 to 3, runs around the clock, costs 5 dollars from the airport station, and reaches downtown in 40 to 45 minutes. Follow the signs reading Trains to City through the lower level tunnels.

The math: 45 minutes in, 45 minutes back, plus an hour for getting landside, returning, and clearing security again. That leaves roughly four hours downtown on an 8 hour layover. Ride to Washington or Monroe, walk 10 minutes east to Millennium Park for the bean, then follow the Riverwalk and eat something that did not come from a terminal. Be back on a return train with three full hours to spare before departure, more if you are flying internationally out of Terminal 5.

If your 8 hours land overnight, when downtown is closed and the Blue Line crawls on 30 minute headways, treat it as an overnight instead.

Overnight: doable, not lovable

The terminals stay open overnight and security will not throw you out, but O'Hare offers no rest zones or sleep pods. Checkpoint hours vary by terminal and close overnight, with exact reopening times to be confirmed, so if you are airside with an early flight, stay airside. Travelers consistently report the most sleepable benches around the Terminal 1 B gates and the upper rotunda area of Terminal 2 near the E and F gates, where padded seating and outlets line up.

The grown up option is the Hilton Chicago O'Hare, the only hotel on the terminal core, connected by underground walkway to Terminals 1 to 3 and selling day use rooms as well as overnight stays. For sleep spot detail, terminal by terminal, read the guide to sleeping at O'Hare.