I always arrive between 2-3 hrs prior for international flights
2hrs will be fine
3hours its ok
If you arrive at Terminal 5 90 minutes before you should be ok. Check-in is close to the security check, the lounge is just next to the security check and the gate is close to the lounge, so not too much walking 😊 Be aware that they're doing some work on the inter Terminal rail so there's bus transport between terminals, if you're taking the Blue Line from downtown Chicago.
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