HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Key Largo

$55+ 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 1/22. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — MIA
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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 September or August, booked 23 days in advance, depart on a Monday or Thursday and return on a Friday

Cheap flight deals from O'Hare Intl to Key Largo

Cheapest flights from O'Hare Intl to Key Largo
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 December 12, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/11. 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 12/316:05 pmORD - MIA
Nonstop3h 16mSpirit Airlines
Thu 1/155:54 amMIA - ORD
Nonstop3h 24mSpirit Airlines
Deal found 12/11$106
This Kiwi.com deal was found by Cheapflights users on 12/11. 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 12/316:05 pmORD - MIA
Nonstop3h 16mSpirit Airlines
Sat 1/105:54 amMIA - ORD
Nonstop3h 24mSpirit Airlines
Deal found 12/11$124
This Kiwi.com deal was found by Cheapflights users on 12/11. 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 12/316:05 pmORD - MIA
Nonstop3h 16mSpirit Airlines
Wed 1/710:13 amMIA - ORD
1 stop6h 47mSpirit Airlines
Deal found 12/11$129
This Kiwi.com deal was found by Cheapflights users on 12/11. 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 12/316:05 pmORD - MIA
Nonstop3h 16mMultiple Airlines
Tue 1/137:00 amMIA - ORD
1 stop6h 08mMultiple Airlines
Deal found 12/11$130
This CheapOair deal was found by Cheapflights users on 12/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/306:05 pmORD - MIA
Nonstop3h 16mSpirit Airlines
Wed 1/72:35 pmMIA - ORD
Nonstop3h 25mSpirit Airlines
Deal found 12/10$131
This Kiwi.com deal was found by Cheapflights users on 12/11. 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 12/316:05 pmORD - MIA
Nonstop3h 16mMultiple Airlines
Thu 1/85:21 pmMIA - ORD
1 stop8h 21mMultiple Airlines
Deal found 12/11$134
This Kiwi.com deal was found by Cheapflights users on 12/11. 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 12/316:05 pmORD - MIA
Nonstop3h 16mMultiple Airlines
Thu 1/157:45 amMIA - ORD
1 stop7h 32mMultiple Airlines
Deal found 12/11$138
This Kiwi.com deal was found by Cheapflights users on 12/11. 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 12/316:05 pmORD - MIA
Nonstop3h 16mMultiple Airlines
Mon 1/127:00 amMIA - ORD
1 stop5h 35mMultiple Airlines
Deal found 12/11$139
This Kiwi.com deal was found by Cheapflights users on 12/11. 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.
Mon 12/157:41 pmORD - MIA
Nonstop3h 16mSpirit Airlines
Thu 1/153:48 pmMIA - ORD
Nonstop3h 28mSpirit Airlines
Deal found 12/11$147

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 December 12, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$101
(Kiwi.com)

One-way from

$55
(CheapOair)

Popular in

December

Cheapest in

September

Average price

$364
Provider with most accurate pricing for Chicago (CHI)-Miami flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-Miami flights.
Search Deals
From Chicago O'Hare Intl to Key Largo
Search Deals
One-way flight from Chicago O'Hare Intl to Key Largo
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($21 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 12, 2025.
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

O'Hare Intl

Fly to

Key Largo

Route

Depart

Return

Price

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Thu 2/19

7:23 pm-11:39 pm

Nonstop3h 16m

Miami

Mon 2/23

7:12 am-9:39 am

Nonstop3h 27m

$115

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Sun 1/25

1:58 pm-10:03 pm

1 stop7h 05m

Miami

Tue 1/27

1:21 pm-7:21 pm

1 stop7h 00m

$217

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Sat 2/7

6:03 pm-12:51 am

1 stop5h 48m

Miami

Tue 2/10

8:05 am-1:13 pm

1 stop6h 08m

$217

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Tue 1/20

11:15 am-5:15 pm

1 stop5h 00m

Miami

Tue 2/17

6:00 am-10:08 am

1 stop5h 08m

$217

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Sat 1/10

5:59 pm-12:51 am

1 stop5h 52m

Miami

Sat 1/17

8:05 am-1:08 pm

1 stop6h 03m

$217

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Wed 1/21

11:15 am-5:15 pm

1 stop5h 00m

Miami

Thu 2/19

7:20 pm-11:57 pm

1 stop5h 37m

$217

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Tue 1/6

12:02 pm-7:46 pm

1 stop6h 44m

Miami

Thu 1/15

8:05 am-1:08 pm

1 stop6h 03m

$217

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Thu 1/1

5:30 am-11:36 am

1 stop5h 06m

Miami

Tue 1/13

12:00 pm-4:44 pm

1 stop5h 44m

$243

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Sat 1/31

12:55 pm-5:15 pm

Nonstop3h 20m

Miami

Tue 2/3

4:19 pm-6:55 pm

Nonstop3h 36m

$257

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Mon 1/12

1:45 pm-10:00 pm

2 stops7h 15m

Miami

Fri 1/16

7:00 am-1:00 pm

1 stop7h 00m

$287

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/11

Showing 1-10 of 24 results
1
2
3

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.
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

How far ahead should I book a flight from Chicago O'Hare Intl Airport to Key Largo?

Use this chart to determine the optimal time to book a round-trip flight from O'Hare Intl to Key Largo. Price data was last updated on December 5, 2025.

To ensure you get the cheapest price possible for a flight from Chicago O'Hare Intl Airport to Key Largo, you should look to book at least 23 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Chicago O'Hare Intl Airport to Key Largo?

Currently, February is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to Key Largo (average of $73). Flying from Chicago O'Hare Intl Airport to Key Largo in June is currently the most expensive (average of $117). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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 December 12, 2025.

It’s optimal to fly from Chicago O'Hare Intl Airport to Key Largo in the afternoon. By choosing this option you can save up to 30% on the cost of your flight, compared to a flight in the evening.

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 December 16, 2024.

Travelers seeking maximum savings on their Chicago O'Hare Intl Airport to Key Largo flight should consider departing on Wednesday mornings when fares are most often at their lowest. Saturday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 December 12, 2025.

The most flights from ORD to KE9 are scheduled on a Thursday (41 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (31 on average).

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 December 12, 2025.
See what other customers who have flown with Delta, United Airlines, and American Airlines 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.
Delta
7.9
Good
8,007 reviews

Food

7.3

Comfort

7.9

Crew

8.5

Entertainment

7.9

Boarding

8.1

Overall

7.9

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
Delta
7.9
Good
8,007 reviews
Delta
7.9
Good
8,007 reviews

Food

7.3

Comfort

7.9

Crew

8.5

Entertainment

7.9

Boarding

8.1

Overall

7.9

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
United Airlines
7.4
Good
9,095 reviews
Delta
7.9
Good
8,007 reviews

Food

7.3

Comfort

7.9

Crew

8.5

Entertainment

7.9

Boarding

8.1

Overall

7.9

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
American Airlines
7.2
Good
11,049 reviews
Delta
7.9
Good
8,007 reviews

Food

7.3

Comfort

7.9

Crew

8.5

Entertainment

7.9

Boarding

8.1

Overall

7.9

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
Spirit Airlines
6.3
Okay
8,180 reviews
Delta
7.9
Good
8,007 reviews

Food

7.3

Comfort

7.9

Crew

8.5

Entertainment

7.9

Boarding

8.1

Overall

7.9

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
Frontier
5.8
Fair
3,084 reviews
Delta
7.9
Good
8,007 reviews

Food

7.3

Comfort

7.9

Crew

8.5

Entertainment

7.9

Boarding

8.1

Overall

7.9

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.

Related info for your journey

Find useful and relevant information for your journey from O'Hare Intl to Key Largo. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Chicago O'Hare Intl Airport to Key Largo?

    Departing from Chicago O'Hare Intl Airport to Key Largo will take you 3h 16m. The distance between Chicago O'Hare Intl Airport and Key Largo is about 1198 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines to fly from Chicago O'Hare Intl Airport to Key Largo one-way?

    To fly one-way, consider booking your trip with Spirit Airlines, which is currently one of the cheapest options available, starting at $42. Frontier flights start at $58 while deals on American Airlines start at $78 one-way.

  • What are the most reliable airlines from Chicago O'Hare Intl Airport to Key Largo?

    The top 3 most reliable airlines when flying from Chicago O'Hare Intl Airport to Key Largo are Emirates (100%), ANA (100%) and Spirit Airlines (87%).

  • What are the cheapest flights from Chicago O'Hare Intl Airport to Key Largo?

    While on average a flight from Chicago O'Hare Intl Airport to Key Largo is generally $721, our data shows the cheapest flight currently is $54. When looking at the most popular route, (Chicago O'Hare Intl - Miami), you can expect to pay $64 for that flight.

  • Can I find deals for flights from O'Hare Intl to Key Largo that include hotel bookings?

    Yes. In addition to deals on O'Hare Intl to Key Largo flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from O'Hare Intl to Key Largo?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from O'Hare Intl to Key Largo.

  • Can I find deals for business class flights from O'Hare Intl to Key Largo?

    Yes. Cheapflights offers flight deals from O'Hare Intl to Key Largo by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Chicago O'Hare Intl Airport to Key Largo?

    Currently, February is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to Key Largo (average of $73). Flying from Chicago O'Hare Intl Airport to Key Largo in June is currently the most expensive (average of $117). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for O'Hare Intl to Key Largo

See prices for flight routes from nearby airports that may be better suited for you.
O'Hare Intl to Orlando flights
O'Hare Intl to Fort Lauderdale flights
O'Hare Intl to Miami flights
O'Hare Intl to Tampa flights
Midway to Miami flights
O'Hare Intl to Fort Myers flights
Midway to Orlando flights
Midway to Fort Lauderdale flights
O'Hare Intl to West Palm Beach flights
Midway to Tampa flights
O'Hare Intl to Key West flights
O'Hare Intl to Sarasota flights
Midway to Fort Myers flights
O'Hare Intl to Jacksonville flights
O'Hare Intl to Pensacola flights
Midway to West Palm Beach flights
O'Hare Intl to Panama City flights
Midway to Key West flights
Midway to Sarasota flights
Rockford to St Petersburg flights
Rockford to Orlando Sanford Intl flights
Midway to Jacksonville flights
Midway to Pensacola flights
Midway to Panama City flights
Rockford to Punta Gorda flights
O'Hare Intl to Valparaiso flights
O'Hare Intl to Daytona Beach flights
O'Hare Intl to St Petersburg flights
O'Hare Intl to Tallahassee flights
O'Hare Intl to Melbourne flights
O'Hare Intl to Punta Gorda flights
Midway to Melbourne flights
Midway to Daytona Beach flights
Midway to Punta Gorda flights
Midway to Valparaiso flights
Midway to Tallahassee flights
O'Hare Intl to Gainesville flights
O'Hare Intl to Orlando Sanford Intl flights
Midway to Gainesville flights
Midway to Valdosta flights
O'Hare Intl to Valdosta flights
Midway to Orlando Sanford Intl flights
O'Hare Intl to Destin flights

Top 8 airlines flying from O'Hare Intl to Key Largo

Discover the top 8 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 December 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$54Average$191FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$85Average$256FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$130Average$289FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$166Average$371FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$166Average$372FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$167Average$405FlexibilityNo cancel feeOn-time69%
DeltaCheapest$176Average$361FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$176Average$215FlexibilityNo cancel feeOn-time75%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.