$91+ Cheap flights from O'Hare Intl (ORD) to Key Largo, FL
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/16. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — MIA
Sep 3 — Sep 101
Round-trip
1 adult, Economy
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Find cheap flights from O'Hare Intl to Key Largo with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Chicago O'Hare Intl to Key Largo are usually found in January or September, booked 41 days in advance, depart on a Saturday or Monday and return on a Friday
Cheap flight deals from O'Hare Intl to Key Largo
Cheapest
Best
Last-minute
One-way
Cheapest flights from O'Hare Intl to Key LargoExplore the most affordable flight options available from O'Hare Intl to Key Largo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 4, 2026.
Explore the most affordable flight options available from O'Hare Intl to Key Largo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 4, 2026.
This United Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/16:00 am -
1 stop7h 46m
Tue 9/812:17 pm -
Nonstop3h 31m
Deal found 7/30![United Airlines logo]()
$177
This Cheapflightsfares deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/196:30 am -
1 stop17h 16m
Mon 9/215:50 am -
1 stop19h 33m
Deal found 7/31![Frontier logo]()
$178
This Mytrip deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1912:56 pm -
1 stop23h 46m
Thu 9/246:46 pm -
1 stop6h 59m
Deal found 7/31![Frontier logo]()
$179
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/177:25 am -
1 stop7h 18m
Mon 9/219:30 pm -
1 stop15h 21m
Deal found 7/30![Frontier logo]()
$180
This United Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1110:30 am -
Nonstop3h 21m
Mon 9/143:57 pm -
Nonstop3h 33m
Deal found 8/3![United Airlines logo]()
$181
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/187:10 am -
1 stop8h 11m
Thu 8/209:48 pm -
1 stop26h 39m
Deal found 7/30![Frontier logo]()
$182
This American Airlines deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/116:00 am -
Nonstop3h 17m
Mon 9/144:52 pm -
Nonstop3h 46m
Deal found 7/31![American Airlines logo]()
$183
This Cheapflightsfares deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/157:00 am -
1 stop12h 33m
Mon 10/192:23 pm -
1 stop23h 09m
Deal found 8/1![Frontier logo]()
$184
This Kissandfly.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/117:30 am -
Nonstop3h 24m
Mon 9/145:50 am -
1 stop19h 33m
Deal found 8/2![Frontier logo]()
$185
This Frontier deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/67:25 am -
1 stop9h 34m
Sat 10/1010:03 am -
1 stop11h 25m
Deal found 7/31![Frontier logo]()
$186
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/261:59 pm -
1 stop8h 06m
Fri 8/2811:10 am -
1 stop9h 49m
Deal found 7/30![Frontier logo]()
$187
This Kiwi.com deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/181:59 pm -
1 stop8h 06m
Wed 8/1911:10 am -
1 stop9h 58m
Deal found 8/1![Frontier logo]()
$188
Best flights from O'Hare Intl to Key LargoDiscover carefully curated flight deals from O'Hare Intl to Key Largo that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 4, 2026.
Discover carefully curated flight deals from O'Hare Intl to Key Largo that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 4, 2026.
This United Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2710:32 am -
Nonstop3h 22m
Thu 9/312:17 pm -
Nonstop3h 31m
Deal found 8/3![United Airlines logo]()
$191
This Delta deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2210:50 am -
1 stop5h 07m
Wed 8/2612:05 pm -
1 stop5h 46m
Deal found 7/31![Delta logo]()
$217
This United Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1910:30 am -
Nonstop3h 21m
Sat 9/267:00 am -
1 stop8h 45m
Deal found 8/3![United Airlines logo]()
$201
This United Airlines deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/276:00 am -
1 stop7h 46m
Mon 8/3112:17 pm -
Nonstop3h 31m
Deal found 7/31![United Airlines logo]()
$237
This United Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2910:32 am -
Nonstop3h 22m
Mon 8/315:01 pm -
1 stop8h 58m
Deal found 8/3![United Airlines logo]()
$238
This United Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/312:25 pm -
Nonstop3h 20m
Wed 11/119:00 am -
Nonstop3h 34m
Deal found 7/30![United Airlines logo]()
$261
This United Airlines deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/810:30 am -
Nonstop3h 21m
Thu 9/103:57 pm -
Nonstop3h 33m
Deal found 7/31![United Airlines logo]()
$281
This United Airlines deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/108:42 am -
2 stops9h 10m
Tue 9/155:01 pm -
1 stop7h 26m
Deal found 8/4![United Airlines logo]()
$306
This United Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/196:00 am -
1 stop7h 46m
Thu 8/203:57 pm -
Nonstop3h 33m
Deal found 7/30![United Airlines logo]()
$323
This United Airlines deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/117:30 am -
Nonstop3h 24m
Mon 9/145:01 pm -
1 stop8h 58m
Deal found 8/4![United Airlines logo]()
$353
This United Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2210:32 am -
Nonstop3h 22m
Mon 8/245:01 pm -
1 stop7h 25m
Deal found 7/30![United Airlines logo]()
$353
This United Airlines deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/268:50 am -
2 stops9h 02m
Sat 10/37:00 am -
1 stop6h 54m
Deal found 8/2![United Airlines logo]()
$378
Last-minute flights from O'Hare Intl to Key LargoDiscover last-minute flight deals from O'Hare Intl to Key Largo. Data last updated August 4, 2026 and is based on user searches.
Discover last-minute flight deals from O'Hare Intl to Key Largo. Data last updated August 4, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/187:10 am -
1 stop8h 11m
Thu 8/209:48 pm -
1 stop26h 39m
Deal found 7/30![Frontier logo]()
$182
This Kiwi.com deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/181:59 pm -
1 stop8h 06m
Wed 8/1911:10 am -
1 stop9h 58m
Deal found 8/1![Frontier logo]()
$188
This Frontier deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/247:05 am -
1 stop5h 27m
Thu 9/39:35 am -
1 stop10h 37m
Deal found 7/31![Frontier logo]()
$186
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/261:59 pm -
1 stop8h 06m
Fri 8/2811:10 am -
1 stop9h 49m
Deal found 7/30![Frontier logo]()
$187
This United Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/16:00 am -
1 stop7h 46m
Tue 9/812:17 pm -
Nonstop3h 31m
Deal found 7/30![United Airlines logo]()
$177
This United Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1110:30 am -
Nonstop3h 21m
Mon 9/143:57 pm -
Nonstop3h 33m
Deal found 8/3![United Airlines logo]()
$181
This American Airlines deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/116:00 am -
Nonstop3h 17m
Mon 9/144:52 pm -
Nonstop3h 46m
Deal found 7/31![American Airlines logo]()
$183
This Kissandfly.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/117:30 am -
Nonstop3h 24m
Mon 9/145:50 am -
1 stop19h 33m
Deal found 8/2![Frontier logo]()
$185
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/177:25 am -
1 stop7h 18m
Mon 9/219:30 pm -
1 stop15h 21m
Deal found 7/30![Frontier logo]()
$180
This Cheapflightsfares deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/196:30 am -
1 stop17h 16m
Mon 9/215:50 am -
1 stop19h 33m
Deal found 7/31![Frontier logo]()
$178
This Mytrip deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1912:56 pm -
1 stop23h 46m
Thu 9/246:46 pm -
1 stop6h 59m
Deal found 7/31![Frontier logo]()
$179
This Cheapflightsfares deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/246:20 am -
1 stop6h 22m
Mon 9/2811:25 am -
1 stop11h 14m
Deal found 8/2![Frontier logo]()
$184
One-way flights from O'Hare Intl to Key LargoSearch for one-way flight options from O'Hare Intl to Key Largo. Find affordable one-way fares based on user searches. Data last updated August 4, 2026.
Search for one-way flight options from O'Hare Intl to Key Largo. Find affordable one-way fares based on user searches. Data last updated August 4, 2026.
This Super.com deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/166:30 am -
1 stop17h 16m
Deal found 8/3![Frontier logo]()
$91
This Frontier deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/157:00 am -
1 stop12h 33m
Deal found 7/31![Frontier logo]()
$92
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/181:59 pm -
1 stop22h 33m
Deal found 7/30![Frontier logo]()
$93
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/176:30 am -
1 stop13h 03m
Deal found 7/30![Frontier logo]()
$94
This American Airlines deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/125:29 pm -
Nonstop3h 16m
Deal found 8/4![American Airlines logo]()
$95
This United Airlines deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/17:30 am -
Nonstop3h 24m
Deal found 8/2![United Airlines logo]()
$96
This American Airlines deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/135:05 am -
Nonstop3h 08m
Deal found 8/1![American Airlines logo]()
$97
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/197:05 am -
1 stop8h 16m
Deal found 7/30![Frontier logo]()
$100
This Kiwi.com deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/306:30 am -
1 stop17h 16m
Deal found 8/1![Frontier logo]()
$102
Find flight deals from O'Hare Intl to Key Largo
Keep the following information in mind while searching for O'Hare Intl to Key Largo flight deals. Data was last updated August 4, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $177 (United Airlines) |
One-way from | $91 (Super.com) |
Popular in | June |
Cheapest in | January |
Average price | $264 |
Cheapflights Fare Finder
Customize your flight search to find flights from O'Hare Intl to Key Largo that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 4, 2026.
Use the filters below to find and compare flights from Chicago O'Hare Intl Airport to Key Largo that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
ChicagoMiami
ORD - MIA
ORDMIA
Chicago O'Hare Intl
Thu 8/27
10:32 am-2:54 pm
Nonstop3h 22m
Miami
Thu 9/3
12:17 pm-2:48 pm
Nonstop3h 31m
$191
ChicagoMiami
ORD - MIA
ORDMIA
Chicago O'Hare Intl
Sat 9/19
10:30 am-2:51 pm
Nonstop3h 21m
Miami
Sat 9/26
7:00 am-2:45 pm
1 stop8h 45m
$201
ChicagoMiami
ORD - MIA
ORDMIA
Chicago O'Hare Intl
Sat 8/22
10:50 am-4:57 pm
1 stop5h 07m
Miami
Wed 8/26
12:05 pm-4:51 pm
1 stop5h 46m
$217
ChicagoMiami
ORD - MIA
ORDMIA
Chicago O'Hare Intl
Thu 8/27
6:00 am-2:46 pm
1 stop7h 46m
Miami
Mon 8/31
12:17 pm-2:48 pm
Nonstop3h 31m
$237
ChicagoMiami
ORD - MIA
ORDMIA
Chicago O'Hare Intl
Sat 8/29
10:32 am-2:54 pm
Nonstop3h 22m
Miami
Mon 8/31
5:01 pm-12:59 am
1 stop8h 58m
$238
ChicagoMiami
ORD - MIA
ORDMIA
Chicago O'Hare Intl
Sat 10/31
2:25 pm-6:45 pm
Nonstop3h 20m
Miami
Wed 11/11
9:00 am-11:34 am
Nonstop3h 34m
$261
ChicagoMiami
ORD - MIA
ORDMIA
Chicago O'Hare Intl
Tue 9/8
10:30 am-2:51 pm
Nonstop3h 21m
Miami
Thu 9/10
3:57 pm-6:30 pm
Nonstop3h 33m
$281
ChicagoMiami
ORD - MIA
ORDMIA
Chicago O'Hare Intl
Thu 9/10
8:42 am-6:52 pm
2 stops9h 10m
Miami
Tue 9/15
5:01 pm-11:27 pm
1 stop7h 26m
$306
ChicagoMiami
ORD - MIA
ORDMIA
Chicago O'Hare Intl
Wed 8/19
6:00 am-2:46 pm
1 stop7h 46m
Miami
Thu 8/20
3:57 pm-6:30 pm
Nonstop3h 33m
$323
ChicagoMiami
ORD - MIA
ORDMIA
Chicago O'Hare Intl
Fri 9/11
7:30 am-11:54 am
Nonstop3h 24m
Miami
Mon 9/14
5:01 pm-12:59 am
1 stop8h 58m
$353
Showing 1-10 of 23 resultsSorted by cheapest first
Best time to book a flight from O'Hare Intl to Key Largo
Have a flexible travel schedule? Discover the best time to fly to Key Largo from O'Hare Intl with our price prediction graph.
ORD-MIA
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Chicago O'Hare Intl Airport to Key Largo
ORD-KE9
ORD-MIA
What is the cheapest time of day to fly from ORD to KE9?
Find hourly flight availability from O'Hare Intl to Key Largo. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 4, 2026.
It’s optimal to fly from Chicago O'Hare Intl Airport to Key Largo in the evening. By choosing this option you can save up to 15% on the cost of your flight, compared to a flight in the afternoon.
Weekly flight availability from Chicago O'Hare Intl Airport to Key Largo
Explore weekly flight availability from O'Hare Intl to Key Largo. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated August 4, 2026.
The most flights from ORD to KE9 are scheduled on a Friday (52 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (18 on average).
How much does it cost to fly round-trip from Chicago O'Hare Intl Airport to Key Largo?
Airfare is below average for this route at the moment.
Chicago O'Hare Intl Airport to Key Largo flights typically cost between $186 and $361 in September.The cheapest round-trip price found within the last 5 days was $177 on United Airlines (Sep 1-Sep 8).
What is the cheapest day to fly from Chicago O'Hare Intl Airport to Key Largo?
Use this chart to determine the cheapest time to fly round-trip from O'Hare Intl to Key Largo. Price data was last updated on August 1, 2026.
Travelers seeking maximum savings on their Chicago O'Hare Intl Airport to Key Largo flight should consider departing on Sunday at noon when fares are most often at their lowest. Monday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Reviews of airlines servicing Key Largo
Get insights into the airlines that provide service to Key Largo. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Key Largo. Reviews last updated August 4, 2026.
See what other customers who have flown with Delta,United Airlines, andJetBlue from Chicago O'Hare Intl Airport to Key Largo have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Comfort
7.8
Food
7.2
Crew
8.5
Boarding
8.1
Entertainment
7.8
Overall
7.8
Reviews
1 / 20
4.0
OkayJoel,May 2026
ATL - JAX
Comfort
7.8
Food
7.2
Crew
8.5
Boarding
8.1
Entertainment
7.8
Overall
7.8
Reviews
1 / 20
4.0
OkayJoel,May 2026
ATL - JAX
Comfort
7.8
Food
7.2
Crew
8.5
Boarding
8.1
Entertainment
7.8
Overall
7.8
Reviews
1 / 20
4.0
OkayJoel,May 2026
ATL - JAX
Comfort
7.8
Food
7.2
Crew
8.5
Boarding
8.1
Entertainment
7.8
Overall
7.8
Reviews
1 / 20
4.0
OkayJoel,May 2026
ATL - JAX
Comfort
7.8
Food
7.2
Crew
8.5
Boarding
8.1
Entertainment
7.8
Overall
7.8
Reviews
1 / 20
4.0
OkayJoel,May 2026
ATL - JAX
Comfort
7.8
Food
7.2
Crew
8.5
Boarding
8.1
Entertainment
7.8
Overall
7.8
Reviews
1 / 20
4.0
OkayJoel,May 2026
ATL - JAX
Related info for your journey
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O'Hare Intl and Key Largo flights
Browse other O'Hare Intl and Key Largo flight options. Last updated on August 4, 2026.
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Top 6 airlines flying from O'Hare Intl to Key Largo
Discover the top 6 airlines that operate flights from O'Hare Intl to Key Largo. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 4, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$56 | Average$194 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$89 | Average$243 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$108 | Average$357 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$160 | Average$365 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$163 | Average$387 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$256 | Average$387 | FlexibilityNo cancel fee | On-time63% |