O'Hare is partway through O'Hare 21, a multi-year, multi-billion-dollar rebuild that eventually replaces Terminal 2 with a new Global Terminal and adds two satellite concourses.
Terminal 5's expansion is already finished, while later phases stretch into the early 2030s. Travelers should mainly expect more construction, changing pedestrian routes and a reason to confirm terminal and pickup details close to the actual travel date.
What O'Hare 21 Actually Is
O'Hare 21 is the City of Chicago's long-running modernization plan for the airport's passenger terminals — the biggest capital project in O'Hare's history.
The centerpiece is a new Global Terminal that will eventually replace the aging Terminal 2, along with two new satellite concourses designed to add gate capacity across the airport.
The program was originally budgeted around $8.5 billion when approved. As of 2026, publicly reported projections have placed the overall program cost at roughly $12 billion, with construction continuing into the early 2030s.
It is a genuinely large undertaking. O'Hare handles tens of millions of passengers every year while the airport continues rebuilding facilities around active airline operations.
What's Already Done
The Terminal 5 expansion was one of the first major pieces of the broader modernization program.
The expanded terminal added additional gates and international capacity, along with updated passenger facilities.
Travelers who have used Terminal 5 in recent years may therefore have already experienced one of the completed portions of the O'Hare modernization program.
What's Happening Now and Coming Next
As the program moves into later phases, construction becomes more visible to passengers using the central terminal area.
- Satellite Concourse 1, also known as Concourse D, is part of the next major expansion of gate capacity.
- Terminal 2 is the terminal scheduled to be phased out and replaced as the new Global Terminal project progresses.
- The Global Terminal is planned as a much larger replacement for the existing Terminal 2 facility and is expected later in the overall construction program.
Large airport infrastructure programs can change sequencing and completion schedules as construction progresses. Travelers should treat long-range dates as planning estimates rather than guarantees.
What This Means for Your Trip
You do not need to follow every construction milestone to travel through O'Hare. The practical effects are much simpler.
- Expect occasional longer walks or detours. Temporary pedestrian routing can change around active work areas.
- Give connections some additional buffer. Walking time, terminal movement and security procedures can all add uncertainty during a large airport redevelopment.
- Terminal 2 travelers should pay particular attention. Because that facility is central to the redevelopment program, travelers should confirm their airline terminal close to departure.
- Pickup and drop-off instructions can change. Construction phases can affect roadway access and passenger meeting points, making current instructions more useful than an older map or previous trip experience.
For a normal departure, common guidance of roughly two hours before a domestic flight and three hours before an international flight remains a useful baseline, with additional buffer when construction, weather, traffic or a complicated connection is involved.
Frequently Asked Questions
Is O'Hare still fully operational during construction?
Yes. The modernization work is being completed in phases so airport operations can continue while construction progresses. Travelers may encounter temporary routing changes rather than a shutdown of the airport.
Which terminal is most affected?
Terminal 2 is central to the redevelopment because the existing facility is planned to be replaced by the new Global Terminal.
Should I leave more time because of construction?
A little extra buffer is reasonable, particularly for complicated connections or travel involving areas affected by active construction. Always confirm your current terminal before leaving.
When will O'Hare 21 be finished?
Current planning places major completion into the early 2030s. Individual components can open earlier, and long-range schedules may change as construction progresses.
Can construction affect ground transportation pickup?
It can. Road access, passenger routing and meeting points can change during construction phases, so confirm current pickup instructions on the day of travel.
Confirm current airport details instead of relying on your last O'Hare trip
O'Hare's redevelopment is designed to happen around normal operations, but the airport will continue changing for years. Build a little extra buffer, confirm your terminal and use current pickup instructions instead of assuming the airport works exactly as it did on your previous trip.
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Project details, cost figures and timelines referenced in this guide reflect publicly reported information as of August 2026 and are subject to change as the program progresses. Confirm current airport and airline information before traveling.
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