All transatlantic flights to Chicago land at O’Hare Airport. As a US transport hub, O’Hare is home to both American and United airlines and internationally has a partnership with British Airways (One World Alliance) and BMI (Star Alliance). Alternatively Pakistan International Airlines flies from Manchester to Chicago.

Chicago (IATA: CHI for all airports) is served by two major airports: O'Hare International Airport http://www.ohare.com/ and Midway Airport www.flychicago.com/midway/midwayHomepage.shtm.  Taxis are plentiful both to and from the city center, but they are expensive, especially during rush hours. Expect upwards of $45 for O'Hare and $35 for Midway. CTA trains provide direct service to both larger airports for $2.25 from anywhere in the city — faster than a taxi during rush hour and a lot less expensive.

Many large hotels offer complimentary shuttle vans to one or both airports, or can arrange one for a charge ($20-30) with advance notice.

O'Hare

O'Hare International Airport (IATA: ORD, ICAO: KORD) is 17 miles northwest of downtown and serves several international and domestic carriers. United Airlines united.com has the largest presence here (about 50%) followed by American Airlines aa.com with about 40%. Most connecting flights for smaller cities in the Midwest run through O'Hare. It's one of the biggest airports in the world, and it has a bad reputation for delays and cancellations. Unfortunately, it's too far northwest for most travelers who get stuck overnight to head into the city. As a result, there are plenty of hotels in the O'Hare area. See the O'Hare article for listings.

The CTA Blue Line runs between the Loop and O'Hare in 45-60 minutes.

Midway

Midway International Airport (IATA: MDW, ICAO: KMDW) is 10 miles southwest of downtown. Southwest Airlines southwest.com is the largest carrier here, followed by AirTran airtran.com. If it's an option for your trip, Midway is more compact, less crowded, has fewer delays, and is usually cheaper.

The CTA Orange Line train runs between the Loop and Midway in around 25 minutes. There are a number of hotels clustered around Midway, too — see the Southwest Side article for listings.