Title: £365 Cheap Flights from Porto to Chicago (OPO to ORD) - Expedia.co.uk ![City of Chicago. Image of Chicago downtown and Chicago River with bridges at sunny summer day](https://images.trvl-media.com/place/178248/e6aa83ce-7ad8-43a5-9d1d-b055eefa7e78.jpg?impolicy=fcrop&w=1200&h=500&q=medium) ![](https://images.trvl-media.com/place/178248/e6aa83ce-7ad8-43a5-9d1d-b055eefa7e78.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # £365 Cheap Flights from Porto (OPO) to Chicago (ORD) [View £365 flight on Sat, 24 Jan 2026](https://expedia.co.uk/Flights-Search?trip=oneway&leg1=from:OPO,to:ORD,departure:24/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:364.50&airProductToken=AQpmCjEIyYQBEgM1NDQY7nMgjBgotKODAzCEpIMDOE9AAFgBagVOT0JBR3IJT0xONUM1QldQCjEIyYQBEgMzNDEYjBggrhwo1KSDAzCnqYMDOE9AAVgBagVOT0JBR3IJT0xONUM1QldQEgoIARABGAEqAkJBGAEiBAgBEAEoAigDMA0) - [Return](?flightType=roundtrip) - [One-way](?flightType=oneway) - [Multi-city](?flightType=multicity) ### Travellers Adults ChildrenAges 2 to 17 InfantsYounger than 2 EconomyPremium economyBusiness classFirst class Leaving from Going to Departing Returning Add a place to stay Add a car Direct flights only ## Popular airlines from Porto Airport (OPO) to Chicago O'Hare International Airport (ORD) - ![Air Canada](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AC.svg) Air Canada [](https://www.expedia.co.uk/Flights-Search?leg1=from:opo,to:ord,departure:06/11/2025TANYT&leg2=from:ord,to:opo,departure:13/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AC"}}]) - ![Iberia](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_IB.svg) Iberia [](https://www.expedia.co.uk/Flights-Search?leg1=from:opo,to:ord,departure:06/11/2025TANYT&leg2=from:ord,to:opo,departure:13/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"IB"}}]) - ![Lufthansa](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_LH.svg) Lufthansa [](https://www.expedia.co.uk/Flights-Search?leg1=from:opo,to:ord,departure:06/11/2025TANYT&leg2=from:ord,to:opo,departure:13/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"LH"}}]) - ![Swiss International Air Lines](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_LX.svg) Swiss International Air Lines [](https://www.expedia.co.uk/Flights-Search?leg1=from:opo,to:ord,departure:06/11/2025TANYT&leg2=from:ord,to:opo,departure:13/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"LX"}}]) - ![Turkish Airlines](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_TK.svg) Turkish Airlines [](https://www.expedia.co.uk/Flights-Search?leg1=from:opo,to:ord,departure:06/11/2025TANYT&leg2=from:ord,to:opo,departure:13/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"TK"}}]) - ![TAP Portugal](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_TP.svg) TAP Portugal [](https://www.expedia.co.uk/Flights-Search?leg1=from:opo,to:ord,departure:06/11/2025TANYT&leg2=from:ord,to:opo,departure:13/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"TP"}}]) - ![British Airways](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_BA.svg) British Airways [](https://www.expedia.co.uk/Flights-Search?leg1=from:opo,to:ord,departure:06/11/2025TANYT&leg2=from:ord,to:opo,departure:13/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"BA"}}]) ![notification illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__notification.svg) ### Be in the know Get alerts if flight prices drop or rise\* ![deals illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__deals.svg) ### Book smarter Save up to 25% on select hotels after you book a flight\* ![trophy illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__trophy.svg) ### Earn twice Earn your airline miles on top of our rewards [Sign in](https://www.expedia.co.uk/login) ## Cheap Flights from Porto (OPO) to Chicago (ORD) Prices were available within the past 7 days and start at £365 for one-way flights and £485 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. All deals One way Return ![TAP Portugal](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/TP.gif) Sat, 7 Feb - Wed, 11 Feb OPO Porto ORD Chicago £485 Return found 5 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:OPO,to:ORD,departure:07/02/2026TANYT&leg2=from:ORD,to:OPO,departure:11/02/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:484.70&airProductToken=AQptCjUI1KABEgQxOTM1GO5zIIuSASiwxoQDMOzGhAM4VEAAWAFqCERJU0NPVU5UcghURjBEU0lHNwo0CNSgARIDMjQzGIuSASCuHCi-zYQDMP3RhAM4VEABWAFqCERJU0NPVU5UcghURjBEU0lHNwptCjQI1KABEgMyNDQYrhwgi5IBKOb1hAMwwfmEAzhUQABYAWoIRElTQ09VTlRyCFRGMERTSUc3CjUI1KABEgQxOTM0GIuSASDucyji_YQDMJT-hAM4VEABWAFqCERJU0NPVU5UcghURjBEU0lHNxIKCAEQARgBKgJUUBgBIgQIARABKAIoAygEMAE) ![TAP Portugal](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/TP.gif) Sat, 7 Feb - Wed, 11 Feb OPO Porto ORD Chicago £491 Return found 5 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:OPO,to:ORD,departure:07/02/2026TANYT&leg2=from:ORD,to:OPO,departure:11/02/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:490.10&airProductToken=AQprCjQI1KABEgQxOTI5GO5zIIuSASiMw4QDMMjDhAM4VEAAWAFqB0RJU0NJTlRyCFRGMERTSUc3CjMI1KABEgMyNDMYi5IBIK4cKL7NhAMw_dGEAzhUQABYAWoHRElTQ0lOVHIIVEYwRFNJRzcKawozCNSgARIDMjQ0GK4cIIuSASjm9YQDMMH5hAM4VEAAWAFqB0RJU0NJTlRyCFRGMERTSUc3CjQI1KABEgQxOTI2GIuSASDucyj1-oQDMLH7hAM4VEAAWAFqB0RJU0NJTlRyCFRGMERTSUc3EgoIARABGAEqAlRQGAEiBAgBEAEoAigDKAQwDQ) ![TAP Portugal](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/TP.gif) Sat, 7 Feb - Wed, 11 Feb OPO Porto ORD Chicago £581 Return found 5 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:OPO,to:ORD,departure:07/02/2026TANYT&leg2=from:ORD,to:OPO,departure:11/02/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:580.70&airProductToken=AQpnCjII1KABEgQxOTM1GO5zIIuSASiwxoQDMOzGhAM4VEAAWAFqBUJBU0lDcghURjBCU0lHNwoxCNSgARIDMjQzGIuSASCuHCi-zYQDMP3RhAM4VEABWAFqBUJBU0lDcghURjBCU0lHNwpnCjEI1KABEgMyNDQYrhwgi5IBKOb1hAMwwfmEAzhUQABYAWoFQkFTSUNyCFRGMEJTSUc3CjII1KABEgQxOTM0GIuSASDucyji_YQDMJT-hAM4VEABWAFqBUJBU0lDcghURjBCU0lHNxIKCAEQARgBKgJUUBgBIgQIARABKAIoAygEMAE) ![TAP Portugal](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/TP.gif) Sat, 7 Feb - Wed, 11 Feb OPO Porto ORD Chicago £587 Return found 5 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:OPO,to:ORD,departure:07/02/2026TANYT&leg2=from:ORD,to:OPO,departure:11/02/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:586.10&airProductToken=AQppCjMI1KABEgQxOTI5GO5zIIuSASiMw4QDMMjDhAM4VEAAWAFqBkJBU0lOVHIIVEYwQlNJRzcKMgjUoAESAzI0MxiLkgEgrhwovs2EAzD90YQDOFRAAFgBagZCQVNJTlRyCFRGMEJTSUc3CmkKMgjUoAESAzI0NBiuHCCLkgEo5vWEAzDB-YQDOFRAAFgBagZCQVNJTlRyCFRGMEJTSUc3CjMI1KABEgQxOTI2GIuSASDucyj1-oQDMLH7hAM4VEAAWAFqBkJBU0lOVHIIVEYwQlNJRzcSCggBEAEYASoCVFAYASIECAEQASgCKAMoBDAN) ![Air Canada](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AC.gif) Thu, 20 Nov - Mon, 1 Dec OPO Porto ORD Chicago £593 Return found 5 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:OPO,to:ORD,departure:20/11/2025TANYT&leg2=from:ORD,to:OPO,departure:01/12/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:592.10&airProductToken=AQqaAQoxCMGGARIEOTIzMRjucyClBCiIx_0CMK3I_QI4S0AAWAFqBUJBU0lDcghLTERYRFhCUQoxCMGGARIDODQzGKUEIJjOASjqy_0CMPLP_QI4S0ABWAFqBUJBU0lDcghLTERYRFhCUQoyCMGGARIENTE0MRiYzgEgrhwohtX9AjCE1v0COEtAAVgBagVCQVNJQ3IIS0xEWERYQlEKlwEKMAjBhgESAzUyMhiuHCCYXSjqyP4CMOnJ_gI4S0AAWAFqBUJBU0lDcghLTERYRFhCUQowCMGGARIDODQ0GJhdIKUEKN_K_gIwoc7-AjhLQAFYAWoFQkFTSUNyCEtMRFhEWEJRCjEIwYYBEgQ5MjMwGKUEIO5zKLfP_gIw3ND-AjhLQAFYAWoFQkFTSUNyCEtMRFhEWEJREgoIAhABGAIqAkFDGAEiBAgBEAEoAigDKAQwAQ) ![Iberia](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/IB.gif) Sat, 7 Feb - Wed, 11 Feb OPO Porto ORD Chicago £593 Return found 5 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:OPO,to:ORD,departure:07/02/2026TANYT&leg2=from:ORD,to:OPO,departure:11/02/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:592.58&airProductToken=AQpmCjEIyYQBEgM1NDQY7nMgjBgo9MCEAzDEwYQDOE9AAFgBagVOT0JBR3IJT0xON0M4QldQCjEIyYQBEgMzNDEYjBggrhwo-8GEAzDOxoQDOE9AAVgBagVOT0JBR3IJT0xON0M4QldQCmkKMgjCggESAzI5NBiuHCDriQEo7vSEAzC_-IQDOE9AAFgBagVOT0JBR3IJT0xON0M4QjRQCjMIwoIBEgQyNjY2GMuxASDucyjU-4QDMOX8hAM4T0ABWAFqBU5PQkFHcglPTE43QzhCNFASCggBEAEYASoCQkEYASIECAEQASgCKAMwDQ) ![Air Canada](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AC.gif) Thu, 20 Nov - Mon, 1 Dec OPO Porto ORD Chicago £595 Return found 5 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:OPO,to:ORD,departure:20/11/2025TANYT&leg2=from:ORD,to:OPO,departure:01/12/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:594.40&airProductToken=AQqaAQoxCMGGARIEOTIzMRjucyClBCiIx_0CMK3I_QI4S0AAWAFqBUJBU0lDcghLTERYRFhCUQoxCMGGARIDODQzGKUEIJjOASjqy_0CMPLP_QI4S0ABWAFqBUJBU0lDcghLTERYRFhCUQoyCMGGARIENTE0MRiYzgEgrhwohtX9AjCE1v0COEtAAVgBagVCQVNJQ3IIS0xEWERYQlEKmQEKMAjBhgESAzUyMhiuHCCYXSjqyP4CMOnJ_gI4S0AAWAFqBUJBU0lDcghLTERYRFhCUQoxCMGGARIDODMyGJhdIKGkASiRy_4CMLrO_gI4S0ABWAFqBUJBU0lDcghLTERYRFhCUQoyCMGGARIENjMxMhihpAEg7nMo2s_-AjD10P4COEtAAVgBagVCQVNJQ3IIS0xEWERYQlESCggCEAEYAioCQUMYASIECAEQASgCKAMoBDAB) ![Air Canada](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AC.gif) Sat, 7 Feb - Wed, 11 Feb OPO Porto ORD Chicago £595 Return found 5 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:OPO,to:ORD,departure:07/02/2026TANYT&leg2=from:ORD,to:OPO,departure:11/02/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:595.00&airProductToken=AQqaAQoxCMGGARIEOTIzMRjucyClBCjov4QDMI3BhAM4S0AAWAFqBUJBU0lDcghLTERYRFhCUQoyCMGGARIEOTEwNRilBCCYzgEo-MKEAzD7xoQDOEtAAVgBagVCQVNJQ3IIS0xEWERYQlEKMQjBhgESAzUwORiYzgEgrhwogsiEAzD6yIQDOEtAAVgBagVCQVNJQ3IIS0xEWERYQlEKmgEKMQjBhgESBDg5NjAYrhwgmF0o6vKEAzDt84QDOEtAAFgBagVCQVNJQ3IIS0xEWERYQlEKMQjBhgESAzgzMhiYXSChpAEokfWEAzC6-IQDOEtAAVgBagVCQVNJQ3IIS0xEWERYQlEKMgjBhgESBDYzMTIYoaQBIO5zKNr5hAMw9fqEAzhLQAFYAWoFQkFTSUNyCEtMRFhEWEJREgoIAhABGAIqAkFDGAEiBAgBEAEoAigDKAQwAQ) ![Lufthansa](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/LH.gif) Sat, 7 Feb - Wed, 11 Feb OPO Porto ORD Chicago £597 Return found 5 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:OPO,to:ORD,departure:07/02/2026TANYT&leg2=from:ORD,to:OPO,departure:11/02/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:596.60&airProductToken=AQprCjQIzJABEgQxMTgxGO5zIKUEKOi_hAMwjcGEAzhLQABYAWoIRUNPTElHSFRyCEtMRjZEWEJRCjMIzJABEgM0MzAYpQQgrhwozsGEAzD-xYQDOEtAAVgBaghFQ09MSUdIVHIIS0xGNkRYQlEKaQoxCMywARIBORiuHCC5PCjS9YQDMOT5hAM4S0AAWAFqCEVDT0xJR0hUcghLTEY2RFhCUQo0CMywARIEMjA2NBi5PCDucyjg_IQDMPv9hAM4S0ABWAFqCEVDT0xJR0hUcghLTEY2RFhCURIKCAIQARgCKgJMSBgBIgQIARABKAIoAygEMAs) ![Turkish Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/TK.gif) Thu, 18 Dec - Fri, 2 Jan OPO Porto ORD Chicago £667 Return found 12 hours ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:OPO,to:ORD,departure:18/12/2025TANYT&leg2=from:ORD,to:OPO,departure:02/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:666.38&airProductToken=AQpdCi0I1JYBEgQxNDUyGO5zIMicASjqhoADMIeJgAM4VkAAWAFqAlBTcgZWTjJYUEMKLAjUlgESAzE4NRjInAEgrhwo04yAAzCFkoADOFZAAVgBagJQU3IGVk4yWFBDCl0KLAjUlgESAzE4NhiuHCDInAEorrCBAzCatYEDOFZAAFgBagJQU3IGVk4yWFBDCi0I1JYBEgQxNDUxGMicASDucyiHuIEDMK66gQM4VkABWAFqAlBTcgZWTjJYUEMSCggBEAEYASoCVEsYASIECAEQASgCKAMoBDAB) ## Find the cheapest month to fly from Porto (OPO) to Chicago (ORD) ### September is typically the cheapest month to fly From £381 - £737 per traveller. Flight from Porto to Chicago route information | Origin airport | Dr. Francisco de Sa Carneiro | | --- | --- | | Destination airport | O'Hare Intl. | | Airlines serving | Air Canada, Air France, British Airways, Iberia, Lufthansa, Swiss International Air Lines, TAP Portugal, Turkish Airlines | | Return price | £485 | | Distance | 6295 km | ## Compare flights from Porto to Chicago easily and book with confidence For travelling on business or for pleasure, Expedia makes it easy to book your flights from Porto to Chicago. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to O'Hare Intl. in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Dr. Francisco de Sa Carneiro to O'Hare Intl..   To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights.  Grab a great deal on your flight from Dr. Francisco de Sa Carneiro (OPO) to O'Hare Intl. (ORD) The easiest way to view the best deals on flights from Porto to Chicago today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Dr. Francisco de Sa Carneiro to O'Hare Intl. start at just £485 and range up to £692.   To find an even better deal, try   - being flexible on your dates – midweek flights can be cheaper - looking for other airports near Porto and Chicago - booking your flight during February, the cheapest month on this route - varying your flight times – early morning and late at night are sometimes cheaper  Why you should book your Porto to Chicago flight with Expedia! We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Dr. Francisco de Sa Carneiro to O'Hare Intl. for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.   Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.   ## Frequently asked questions ### How much is a flight from OPO to ORD? > Pack your bags, because round-trip flights between Porto Airport and ORD start from £485. That's based on airfares available within the last 7 days on Expedia for flights departing within the next year. Prices can go up quickly, so book today to secure the best deal. Prices and availability are subject to change. Additional terms apply. ### Do I need to pay a cancellation fee if I cancel my flight from Porto Airport to O'Hare Airport? > This differs between air carriers, as each has its own set of terms and conditions. Visit the [Customer Service Portal](https://www.expedia.co.uk/service/?langid=1033), where you'll find easy instructions on how to cancel online. ### How do I find cheap flights from Porto Airport to O'Hare Intl. Airport (ORD) that have flexible change policies? > Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for Porto Airport to O'Hare Airport flights, you'll see a "no change fees" filter for you to select. ### How far is the flight from OPO to O'Hare Intl. Airport (ORD)? > You'll have 6,300 kilometres to cover on the long-haul Maia to Chicago route. Dress in comfy clothes and consider taking a travel pillow with you. ### Which airlines fly direct from Dr. Francisco de Sa Carneiro Airport (OPO) to O'Hare Intl. Airport (ORD)? > Unfortunately, there aren't any airlines that fly direct between Dr. Francisco de Sa Carneiro Airport (OPO) and O'Hare Airport. You'll need to book a flight with one or more stops. ### Are Porto Airport to O'Hare Airport flight tickets cheaper when they're purchased at the last minute? > Flight prices go up and down like a yo-yo, so it's no sure thing. While last-minute flight deals between Porto Airport and O'Hare Airport are of course possible, it's also a good idea to keep a close eye on prices well before you fly. In fact, some airlines release their prices up to 12 months before the departure date. Expedia is continuously updating the best bargains around, so check back often and be ready to book when the price dips. ## Explore a world of travel with Expedia - Flights ### Flights - [Flights from Lake Of The Ozarks (AIZ) to Chicago (CHI)](https://www.expedia.co.uk/lp/flights/aiz/chi/lake-of-the-ozarks-to-chicago) - [Flights from Amsterdam (AMS) to Chicago (CHI)](https://www.expedia.co.uk/lp/flights/ams/chi/amsterdam-to-chicago) - [Flights from Atlanta (ATL) to Chicago (CHI)](https://www.expedia.co.uk/lp/flights/atl/chi/atlanta-to-chicago) - [Flights from Abu Dhabi (AUH) to Chicago (MDW)](https://www.expedia.co.uk/lp/flights/auh/mdw/abu-dhabi-to-chicago) - [Flights from Wilkes-Barre (AVP) to Chicago (CHI)](https://www.expedia.co.uk/lp/flights/avp/chi/wilkes-barre-to-chicago) - [Flights from Beirut (BEY) to Chicago (CHI)](https://www.expedia.co.uk/lp/flights/bey/chi/beirut-to-chicago) - [Flights from Birmingham (BHX) to Chicago (CHI)](https://www.expedia.co.uk/lp/flights/bhx/chi/birmingham-to-chicago) - 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