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Key Largo

$40+ 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 3/31. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — MIA
Mar 8 — Mar 151
Sun 3/8
Sun 3/15
1 adult, Economy
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Cheapflights Tip: The best prices from Chicago O'Hare Intl to Key Largo are usually found in September or August, booked 29 days in advance, depart on a Monday or Sunday 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 February 6, 2026.

This Priceline deal was found by Cheapflights users on 2/3. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/79:18 am
ORD
-
MIA
Nonstop3h 18m
Multiple Airlines
Sat 3/147:15 am
MIA
-
ORD
Nonstop3h 38m
Multiple Airlines
Deal found 2/3$84
This CheapOair deal was found by Cheapflights users on 2/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/49:18 am
ORD
-
MIA
1 stop10h 33m
Multiple Airlines
Fri 3/61:00 pm
MIA
-
ORD
Nonstop3h 38m
Multiple Airlines
Deal found 2/3$85
This Cheapflightsfares deal was found by Cheapflights users on 2/3. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/79:18 am
ORD
-
MIA
Nonstop3h 18m
Spirit Airlines
Mon 3/166:00 am
MIA
-
ORD
Nonstop3h 25m
Spirit Airlines
Deal found 2/3$86
This Cheapflightsfares deal was found by Cheapflights users on 2/4. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/89:23 am
ORD
-
MIA
Nonstop3h 18m
Spirit Airlines
Thu 2/127:12 am
MIA
-
ORD
Nonstop3h 27m
Spirit Airlines
Deal found 2/4$87
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/179:18 am
ORD
-
MIA
Nonstop3h 18m
Multiple Airlines
Fri 2/277:00 am
MIA
-
ORD
Nonstop3h 38m
Multiple Airlines
Deal found 2/2$88
This CheapOair deal was found by Cheapflights users on 2/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/109:23 am
ORD
-
MIA
Nonstop3h 18m
Spirit Airlines
Fri 2/137:12 am
MIA
-
ORD
Nonstop3h 27m
Spirit Airlines
Deal found 2/3$89
This Cheapflightsfares deal was found by Cheapflights users on 2/5. 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.
Tue 2/179:18 am
ORD
-
MIA
Nonstop3h 18m
Spirit Airlines
Tue 2/247:12 am
MIA
-
ORD
Nonstop3h 27m
Spirit Airlines
Deal found 2/5$90
This Expedia deal was found by Cheapflights users on 2/5. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/227:23 pm
ORD
-
MIA
Nonstop3h 16m
Multiple Airlines
Fri 2/277:00 am
MIA
-
ORD
Nonstop3h 38m
Multiple Airlines
Deal found 2/5$91
This CheapOair deal was found by Cheapflights users on 2/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/289:18 am
ORD
-
MIA
Nonstop3h 18m
Spirit Airlines
Tue 3/37:12 am
MIA
-
ORD
Nonstop3h 27m
Spirit Airlines
Deal found 2/3$92
This CheapOair deal was found by Cheapflights users on 2/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/257:23 pm
ORD
-
MIA
Nonstop3h 16m
Spirit Airlines
Sat 2/287:12 am
MIA
-
ORD
Nonstop3h 27m
Spirit Airlines
Deal found 2/3$94
This Travelocity deal was found by Cheapflights users on 2/3. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/311:56 am
ORD
-
MIA
1 stop11h 46m
Multiple Airlines
Tue 3/107:12 am
MIA
-
ORD
Nonstop3h 27m
Multiple Airlines
Deal found 2/3$95

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 February 6, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$84
(Priceline)

One-way from

$40
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$263
Provider with most accurate pricing for Chicago (CHI)-Miami flight deals.
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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. 5% potential increase in price ($15 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
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 February 6, 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

O'Hare Intl

Fly to

Key Largo

Route

Depart

Return

Price

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Thu 2/26

8:59 am-8:51 pm

1 stop10h 52m

Miami

Sat 2/28

9:53 pm-7:54 am

1 stop11h 01m

$161

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Tue 3/3

1:10 pm-5:29 pm

Nonstop3h 19m

Miami

Wed 3/11

12:11 pm-2:55 pm

Nonstop3h 44m

$177

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Wed 3/11

7:30 am-11:47 am

Nonstop3h 17m

Miami

Thu 3/19

9:00 am-11:38 am

Nonstop3h 38m

$178

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Sun 3/1

6:07 pm-10:23 pm

Nonstop3h 16m

Miami

Wed 3/4

9:00 am-11:38 am

Nonstop3h 38m

$197

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Fri 2/27

7:23 pm-11:39 pm

Nonstop3h 16m

Miami

Mon 3/2

7:12 am-9:39 am

Nonstop3h 27m

$209

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Tue 2/24

5:25 am-12:23 pm

1 stop5h 58m

Miami

Tue 3/3

12:00 pm-4:51 pm

1 stop5h 51m

$217

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Tue 2/24

11:18 am-6:21 pm

1 stop6h 03m

Miami

Wed 3/4

8:05 am-1:20 pm

1 stop6h 15m

$217

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Thu 2/26

8:59 am-8:51 pm

1 stop10h 52m

Miami

Thu 3/5

9:53 pm-7:54 am

1 stop11h 01m

$217

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Wed 3/4

5:25 am-12:23 pm

1 stop5h 58m

Miami

Wed 3/4

4:46 pm-11:56 pm

1 stop8h 10m

$217

ChicagoMiami

ORD - MIA

ORDMIA

Chicago O'Hare Intl

Wed 5/6

10:49 am-5:11 pm

1 stop5h 22m

Miami

Fri 5/8

7:36 pm-11:59 pm

1 stop5h 23m

$219

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/5

Showing 1-10 of 23 results
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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 January 30, 2026.

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 29 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 $67). Flying from Chicago O'Hare Intl Airport to Key Largo in July is currently the most expensive (average of $118). 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 February 6, 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 26% on the cost of your flight, compared to a flight in the morning.

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 January 31, 2026.

Travelers seeking maximum savings on their Chicago O'Hare Intl Airport to Key Largo flight should consider departing on Thursday at noon 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 February 6, 2026.

The most flights from ORD to KE9 are scheduled on a Thursday (46 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (32 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 February 6, 2026.
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
8,151 reviews

Crew

8.5

Comfort

7.9

Boarding

8.1

Overall

7.9

Entertainment

7.8

Food

7.2

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
8,151 reviews
Delta
7.9
Good
8,151 reviews

Crew

8.5

Comfort

7.9

Boarding

8.1

Overall

7.9

Entertainment

7.8

Food

7.2

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
9,240 reviews
Delta
7.9
Good
8,151 reviews

Crew

8.5

Comfort

7.9

Boarding

8.1

Overall

7.9

Entertainment

7.8

Food

7.2

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
11,237 reviews
Delta
7.9
Good
8,151 reviews

Crew

8.5

Comfort

7.9

Boarding

8.1

Overall

7.9

Entertainment

7.8

Food

7.2

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
8,419 reviews
Delta
7.9
Good
8,151 reviews

Crew

8.5

Comfort

7.9

Boarding

8.1

Overall

7.9

Entertainment

7.8

Food

7.2

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
5.7
Fair
3,052 reviews
Delta
7.9
Good
8,151 reviews

Crew

8.5

Comfort

7.9

Boarding

8.1

Overall

7.9

Entertainment

7.8

Food

7.2

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 19m. 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 Frontier, which is currently one of the cheapest options available, starting at $36. Spirit Airlines flights start at $38 while deals on JetBlue start at $68 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 Avianca (80%), Aer Lingus (79%) and Air New Zealand (78%).

  • 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 $647, our data shows the cheapest flight currently is $51. When looking at the most popular route, (Chicago O'Hare Intl - Miami), you can expect to pay $59 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 $67). Flying from Chicago O'Hare Intl Airport to Key Largo in July is currently the most expensive (average of $118). 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

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Top 7 airlines flying from O'Hare Intl to Key Largo

Discover the top 7 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 February 6, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$54Average$183FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$71Average$255FlexibilityNo cancel feeOn-time65%
DeltaCheapest$108Average$365FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$157Average$380FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$158Average$367FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$166Average$368FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$176Average$249FlexibilityNo cancel feeOn-time75%

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