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 11/1. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — CHI
17 Jan — 24 Jan1
Round-trip
1 adult
Economy
Round-trip
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Ottawa to Chicago are usually found in May or June, booked 51 days in advance, depart on a Saturday or Friday and return on a Wednesday
Cheap flight deals from Ottawa to Chicago
Enter your travel dates to find the best prices.
Cheapest flights from Ottawa to Chicago
Explore the most affordable flight options available from Ottawa to Chicago. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 December 2025.
Wed 31/126:50 a.m.YOW - MDW
1 stop4h 15mPorter Airlines
Tue 6/111:00 a.m.MDW - YOW
1 stop5h 29mPorter Airlines
Deal found 16/12C$ 580
Wed 31/126:50 a.m.YOW - MDW
1 stop4h 15mPorter Airlines
Sat 3/14:15 p.m.MDW - YOW
1 stop5h 14mPorter Airlines
Deal found 16/12C$ 586
Wed 31/126:50 a.m.YOW - MDW
1 stop4h 15mPorter Airlines
Mon 5/14:15 p.m.MDW - YOW
1 stop3h 39mPorter Airlines
Deal found 16/12C$ 612
Wed 31/129:30 a.m.YOW - ORD
1 stop10h 32mMultiple Airlines
Mon 5/14:38 p.m.ORD - YOW
1 stop23h 47mMultiple Airlines
Deal found 16/12C$ 613
Wed 31/129:30 a.m.YOW - MDW
1 stop13h 28mMultiple Airlines
Fri 2/18:15 a.m.MDW - YOW
2 stops14h 43mMultiple Airlines
Deal found 16/12C$ 635
Tue 30/126:50 a.m.YOW - MDW
1 stop4h 15mMultiple Airlines
Fri 2/18:15 a.m.MDW - YOW
2 stops14h 43mMultiple Airlines
Deal found 16/12C$ 650
Wed 31/129:30 a.m.YOW - MDW
1 stop13h 28mMultiple Airlines
Sun 4/14:15 p.m.MDW - YOW
1 stop3h 39mMultiple Airlines
Deal found 16/12C$ 686
Mon 29/124:20 p.m.YOW - ORD
1 stop23h 01mMultiple Airlines
Mon 5/19:09 p.m.ORD - YOW
2 stops49h 49mMultiple Airlines
Deal found 17/12C$ 700
Tue 30/126:50 a.m.YOW - MDW
2 stops7h 11mMultiple Airlines
Sat 3/14:15 p.m.MDW - YOW
1 stop5h 14mMultiple Airlines
Deal found 16/12C$ 730
Wed 31/129:30 a.m.YOW - MDW
1 stop13h 28mMultiple Airlines
Mon 5/16:14 p.m.MDW - YOW
2 stops12h 45mMultiple Airlines
Deal found 16/12C$ 732
Wed 31/129:30 a.m.YOW - ORD
1 stop10h 32mMultiple Airlines
Fri 2/17:20 a.m.ORD - YOW
1 stop15h 38mMultiple Airlines
Deal found 16/12C$ 733
Tue 30/1212:10 p.m.YOW - MDW
1 stop4h 10mPorter Airlines
Fri 2/111:00 a.m.MDW - YOW
1 stop5h 29mPorter Airlines
Deal found 16/12C$ 756
Best flights from Ottawa to Chicago
Discover carefully curated flight deals from Ottawa to Chicago that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 18 December 2025.
Wed 14/17:00 a.m.YOW - ORD
2 stops10h 52mMultiple Airlines
Wed 21/17:21 p.m.ORD - YOW
1 stop18h 37mMultiple Airlines
Deal found 17/12C$ 364
Fri 9/17:00 a.m.YOW - MDW
1 stop4h 05mPorter Airlines
Tue 13/111:00 a.m.MDW - YOW
1 stop5h 29mPorter Airlines
Deal found 16/12C$ 554
Thu 22/15:40 a.m.YOW - MDW
2 stops13h 15mWestJet
Mon 26/19:33 a.m.MDW - YOW
2 stops14h 09mWestJet
Deal found 17/12C$ 573
Thu 29/19:40 a.m.YOW - ORD
1 stop14h 36mMultiple Airlines
Thu 5/27:20 a.m.ORD - YOW
1 stop9h 05mMultiple Airlines
Deal found 17/12C$ 408
Tue 6/13:05 p.m.YOW - ORD
2 stops18h 26mMultiple Airlines
Tue 13/16:05 a.m.ORD - YOW
1 stop10h 08mMultiple Airlines
Deal found 16/12C$ 423
Thu 8/17:00 a.m.YOW - MDW
1 stop4h 05mPorter Airlines
Mon 12/111:00 a.m.MDW - YOW
1 stop5h 29mPorter Airlines
Deal found 16/12C$ 554
Thu 22/15:40 a.m.YOW - MDW
2 stops8h 06mWestJet
Sun 25/19:32 a.m.MDW - YOW
2 stops14h 10mWestJet
Deal found 17/12C$ 573
Tue 13/13:55 p.m.YOW - MDW
1 stop9h 07mMultiple Airlines
Wed 21/11:20 p.m.MDW - YOW
2 stops26h 53mMultiple Airlines
Deal found 16/12C$ 489
Thu 22/15:40 a.m.YOW - ORD
2 stops11h 42mWestJet
Sun 25/18:50 a.m.ORD - YOW
2 stops14h 52mWestJet
Deal found 17/12C$ 573
Fri 6/27:00 a.m.YOW - MDW
1 stop4h 05mPorter Airlines
Sun 8/24:15 p.m.MDW - YOW
1 stop3h 39mPorter Airlines
Deal found 14/12C$ 577
Fri 30/17:00 a.m.YOW - ORD
3 stops27h 43mMultiple Airlines
Fri 6/28:43 p.m.ORD - YOW
2 stops17h 40mMultiple Airlines
Deal found 16/12C$ 496
Fri 23/17:00 a.m.YOW - MDW
1 stop4h 05mPorter Airlines
Sun 25/14:15 p.m.MDW - YOW
1 stop5h 14mPorter Airlines
Deal found 14/12C$ 577
Mon 12/19:30 a.m.YOW - MDW
1 stop14h 39mMultiple Airlines
Mon 19/110:07 a.m.MDW - YOW
1 stop12h 51mMultiple Airlines
Deal found 15/12C$ 504
Thu 12/35:40 a.m.YOW - ORD
2 stops28h 17mWestJet
Tue 17/312:00 p.m.ORD - YOW
2 stops11h 39mWestJet
Deal found 16/12C$ 635
Wed 31/126:50 a.m.YOW - MDW
1 stop4h 15mPorter Airlines
Tue 6/111:00 a.m.MDW - YOW
1 stop5h 29mPorter Airlines
Deal found 16/12C$ 580
Mon 2/34:15 p.m.YOW - ORD
2 stops19h 36mMultiple Airlines
Fri 6/36:17 p.m.ORD - YOW
1 stop22h 08mMultiple Airlines
Deal found 15/12C$ 530
Thu 12/36:50 a.m.YOW - MDW
2 stops7h 12mMultiple Airlines
Tue 17/37:30 a.m.MDW - YOW
1 stop8h 55mMultiple Airlines
Deal found 16/12C$ 536
Fri 23/19:30 a.m.YOW - ORD
1 stop9h 22mMultiple Airlines
Tue 27/16:05 a.m.ORD - YOW
1 stop10h 08mMultiple Airlines
Deal found 17/12C$ 552
Tue 17/24:20 p.m.YOW - MDW
2 stops27h 47mMultiple Airlines
Sun 22/24:15 p.m.MDW - YOW
1 stop5h 14mMultiple Airlines
Deal found 17/12C$ 554
Fri 30/14:20 p.m.YOW - MDW
2 stops17h 23mMultiple Airlines
Fri 6/211:05 a.m.MDW - YOW
1 stop5h 24mMultiple Airlines
Deal found 16/12C$ 584
Wed 31/129:30 a.m.YOW - ORD
1 stop10h 32mMultiple Airlines
Mon 5/19:34 a.m.ORD - YOW
2 stops28h 30mMultiple Airlines
Deal found 16/12C$ 614
Thu 12/33:55 p.m.YOW - ORD
1 stop8h 38mMultiple Airlines
Tue 17/39:40 a.m.ORD - YOW
1 stop13h 45mMultiple Airlines
Deal found 16/12C$ 659
Direct flights from Ottawa to Chicago
Explore direct flight options from Ottawa to Chicago based on user searches, and compare prices and availability for your desired travel dates. Data last updated 18 December 2025.
Sat 28/26:20 a.m.YOW - ORD
Nonstop2h 40mUnited Airlines
Tue 3/31:55 p.m.ORD - YOW
Nonstop2h 12mUnited Airlines
Deal found 16/12C$ 729
Mon 26/15:11 p.m.YOW - ORD
Nonstop2h 44mUnited Airlines
Thu 29/11:55 p.m.ORD - YOW
Nonstop2h 17mUnited Airlines
Deal found 15/12C$ 737
Mon 2/26:20 a.m.YOW - ORD
Nonstop2h 45mUnited Airlines
Tue 3/21:55 p.m.ORD - YOW
Nonstop2h 17mUnited Airlines
Deal found 17/12C$ 747
Thu 22/15:11 p.m.YOW - ORD
Nonstop2h 44mUnited Airlines
Mon 26/11:55 p.m.ORD - YOW
Nonstop2h 17mUnited Airlines
Deal found 17/12C$ 748
Mon 2/35:11 p.m.YOW - ORD
Nonstop2h 41mUnited Airlines
Fri 6/36:04 p.m.ORD - YOW
Nonstop2h 14mUnited Airlines
Deal found 15/12C$ 774
Mon 9/35:11 p.m.YOW - ORD
Nonstop2h 41mUnited Airlines
Sat 14/37:25 a.m.ORD - YOW
Nonstop2h 01mUnited Airlines
Deal found 17/12C$ 780
Wed 14/15:11 p.m.YOW - ORD
Nonstop2h 44mUnited Airlines
Wed 21/11:55 p.m.ORD - YOW
Nonstop2h 17mUnited Airlines
Deal found 17/12C$ 789
Fri 23/15:11 p.m.YOW - ORD
Nonstop2h 44mAir Canada
Mon 26/11:55 p.m.ORD - YOW
Nonstop2h 17mAir Canada
Deal found 17/12C$ 812
Fri 30/15:11 p.m.YOW - ORD
Nonstop2h 44mAir Canada
Fri 6/21:55 p.m.ORD - YOW
Nonstop2h 17mAir Canada
Deal found 16/12C$ 813
Fri 24/46:52 a.m.YOW - ORD
Nonstop2h 08mAir Canada
Mon 27/42:00 p.m.ORD - YOW
Nonstop1h 50mAir Canada
Deal found 17/12C$ 820
Wed 7/15:11 p.m.YOW - ORD
Nonstop2h 44mUnited Airlines
Wed 14/11:55 p.m.ORD - YOW
Nonstop2h 17mUnited Airlines
Deal found 17/12C$ 832
Mon 9/35:11 p.m.YOW - ORD
Nonstop2h 41mAir Canada
Sat 14/37:25 a.m.ORD - YOW
Nonstop2h 01mAir Canada
Deal found 16/12C$ 849
Last-minute flights from Ottawa to Chicago
Discover last-minute flight deals from Ottawa to Chicago. Data last updated 18 December 2025 and is based on user searches.
Tue 6/14:20 p.m.YOW - ORD
1 stop23h 01mMultiple Airlines
Tue 13/16:05 a.m.ORD - YOW
1 stop10h 08mMultiple Airlines
Deal found 16/12C$ 411
Wed 7/14:15 p.m.YOW - ORD
1 stop29h 15mMultiple Airlines
Wed 14/17:21 p.m.ORD - YOW
1 stop18h 37mMultiple Airlines
Deal found 17/12C$ 327
Thu 8/17:00 a.m.YOW - MDW
1 stop4h 05mPorter Airlines
Tue 13/111:00 a.m.MDW - YOW
1 stop5h 29mPorter Airlines
Deal found 16/12C$ 554
Fri 9/19:15 a.m.YOW - ORD
2 stops14h 27mMultiple Airlines
Mon 12/17:21 p.m.ORD - YOW
1 stop18h 37mMultiple Airlines
Deal found 16/12C$ 394
Mon 12/15:40 a.m.YOW - MDW
2 stops8h 08mMultiple Airlines
Mon 19/110:07 a.m.MDW - YOW
1 stop30h 06mMultiple Airlines
Deal found 15/12C$ 475
Tue 13/13:55 p.m.YOW - MDW
1 stop9h 07mMultiple Airlines
Wed 21/11:20 p.m.MDW - YOW
2 stops26h 53mMultiple Airlines
Deal found 16/12C$ 489
Wed 14/14:15 p.m.YOW - ORD
1 stop29h 42mMultiple Airlines
Wed 21/17:21 p.m.ORD - YOW
1 stop18h 37mMultiple Airlines
Deal found 17/12C$ 325
Thu 22/17:00 a.m.YOW - ORD
1 stop16h 36mMultiple Airlines
Mon 26/17:20 a.m.ORD - YOW
1 stop9h 05mMultiple Airlines
Deal found 17/12C$ 435
Thu 29/19:40 a.m.YOW - ORD
1 stop14h 36mMultiple Airlines
Thu 5/27:20 a.m.ORD - YOW
1 stop9h 05mMultiple Airlines
Deal found 17/12C$ 408
Thu 29/15:40 a.m.YOW - MDW
2 stops8h 06mMultiple Airlines
Thu 5/211:05 a.m.MDW - YOW
1 stop19h 54mMultiple Airlines
Deal found 15/12C$ 507
Thu 29/17:00 a.m.YOW - MDW
1 stop4h 10mPorter Airlines
Thu 5/211:05 a.m.MDW - YOW
1 stop5h 24mPorter Airlines
Deal found 17/12C$ 562
Fri 30/17:15 p.m.YOW - ORD
2 stops28h 29mMultiple Airlines
Fri 6/27:21 p.m.ORD - YOW
1 stop18h 37mMultiple Airlines
Deal found 16/12C$ 390
One-way flights from Ottawa to Chicago
Search for one-way flight options from Ottawa to Chicago. Find affordable one-way fares based on user searches. Data last updated 18 December 2025.
Sun 11/14:20 p.m.YOW - ORD
3 stops28h 18mMultiple Airlines
Deal found 16/12C$ 161
Sat 31/17:00 a.m.YOW - ORD
1 stop15h 03mMultiple Airlines
Deal found 17/12C$ 203
Thu 15/17:00 a.m.YOW - ORD
1 stop14h 57mMultiple Airlines
Deal found 17/12C$ 218
Tue 7/47:00 a.m.YOW - ORD
1 stop29h 26mMultiple Airlines
Deal found 17/12C$ 247
Sat 31/14:20 p.m.YOW - MDW
1 stop28h 32mMultiple Airlines
Deal found 17/12C$ 256
Sun 11/15:40 a.m.YOW - MDW
1 stop10h 40mMultiple Airlines
Deal found 16/12C$ 270
Thu 29/19:40 a.m.YOW - MDW
2 stops31h 09mMultiple Airlines
Deal found 15/12C$ 282
Sun 11/15:45 p.m.YOW - ORD
1 stop20h 50mWestJet
Deal found 16/12C$ 282
Tue 7/47:00 a.m.YOW - MDW
3 stops41h 42mMultiple Airlines
Deal found 17/12C$ 355
Tue 7/48:55 p.m.YOW - MDW
1 stop14h 10mPorter Airlines
Deal found 17/12C$ 361
Sun 11/18:40 a.m.YOW - MDW
1 stop7h 40mPorter Airlines
Deal found 17/12C$ 372
Tue 30/1212:10 p.m.YOW - MDW
1 stop4h 10mPorter Airlines
Deal found 16/12C$ 431
Find flight deals from Ottawa to Chicago
Discover tips and strategies to find the most affordable flight options for your journey from Ottawa (YOW) to Chicago (CHI). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 18 December 2025.
Customize your flight search to find flights from Ottawa to Chicago 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 629,999 searches. Data last updated 18 December 2025.
Use the filters below to find and compare flights from Ottawa to Chicago that are best for you.
Fly from
Ottawa
Fly to
Chicago
Route
Depart
Return
Price
OttawaChicago
YOW - ORD
YOWORD
Ottawa
Wed 14/1
7:00 a.m.-4:52 p.m.
2 stops10h 52m
Chicago O'Hare Intl
Wed 21/1
7:21 p.m.-2:58 p.m.
1 stop18h 37m
C$ 364
OttawaChicago
YOW - ORD
YOWORD
Ottawa
Thu 29/1
9:40 a.m.-11:16 p.m.
1 stop14h 36m
Chicago O'Hare Intl
Thu 5/2
7:20 a.m.-5:25 p.m.
1 stop9h 05m
C$ 408
OttawaChicago
YOW - ORD
YOWORD
Ottawa
Tue 6/1
3:05 p.m.-8:31 a.m.
2 stops18h 26m
Chicago O'Hare Intl
Tue 13/1
6:05 a.m.-5:13 p.m.
1 stop10h 08m
C$ 423
OttawaChicago
YOW - MDW
YOWMDW
Ottawa
Tue 13/1
3:55 p.m.-12:02 a.m.
1 stop9h 07m
Chicago Midway
Wed 21/1
1:20 p.m.-5:13 p.m.
2 stops26h 53m
C$ 489
OttawaChicago
YOW - ORD
YOWORD
Ottawa
Fri 30/1
7:00 a.m.-9:43 a.m.
3 stops27h 43m
Chicago O'Hare Intl
Fri 6/2
8:43 p.m.-3:23 p.m.
2 stops17h 40m
C$ 496
OttawaChicago
YOW - MDW
YOWMDW
Ottawa
Mon 12/1
9:30 a.m.-11:09 p.m.
1 stop14h 39m
Chicago Midway
Mon 19/1
10:07 a.m.-11:58 p.m.
1 stop12h 51m
C$ 504
OttawaChicago
YOW - ORD
YOWORD
Ottawa
Mon 2/3
4:15 p.m.-10:51 a.m.
2 stops19h 36m
Chicago O'Hare Intl
Fri 6/3
6:17 p.m.-5:25 p.m.
1 stop22h 08m
C$ 530
OttawaChicago
YOW - MDW
YOWMDW
Ottawa
Thu 12/3
6:50 a.m.-1:02 p.m.
2 stops7h 12m
Chicago Midway
Tue 17/3
7:30 a.m.-5:25 p.m.
1 stop8h 55m
C$ 536
OttawaChicago
YOW - ORD
YOWORD
Ottawa
Fri 23/1
9:30 a.m.-5:52 p.m.
1 stop9h 22m
Chicago O'Hare Intl
Tue 27/1
6:05 a.m.-5:13 p.m.
1 stop10h 08m
C$ 552
OttawaChicago
YOW - MDW
YOWMDW
Ottawa
Fri 9/1
7:00 a.m.-10:05 a.m.
1 stop4h 05m
Chicago Midway
Tue 13/1
11:00 a.m.-5:29 p.m.
1 stop5h 29m
C$ 554
Flights are sorted by cheapest round-trip flights first.
Deals found on 16/12
Showing 1-10 of 35 results
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Best time to book a flight from Ottawa to Chicago
Have a flexible travel schedule? Discover the best time to fly to Chicago from Ottawa 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 Ottawa to Chicago
How far ahead should I book a flight from Ottawa to Chicago?
Use this chart to determine the optimal time to book a round-trip flight from Ottawa to Chicago. Price data was last updated on 12 December 2025.
Booking 51 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ottawa to Chicago. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
What is the cheapest month to book a flight from Ottawa to Chicago?
Currently, September is the cheapest month in which you can book a flight from Ottawa to Chicago (average of C$ 180). Flying from Ottawa to Chicago in December is currently the most expensive (average of C$ 373). 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 YOW to CHI?
Find hourly flight availability from Ottawa to Chicago. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 18 December 2025.
When flying from Ottawa to Chicago, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
What’s the top layover airport for flights from Ottawa to Chicago?
Share of one-stop round-trip flights from Ottawa to Chicago chosen by Cheapflights users in the past 12 months, using the same layover each way.
Toronto (YTZ) – chosen by Cheapflights users on 90% of one-stop itineraries from Ottawa to Chicago on Cheapflights.
What’s the cheapest layover airport for flights from Ottawa to Chicago?
Average round-trip fare for 1-stop flights from Ottawa to Chicago, chosen by Cheapflights users in the past 12 months, with the same layover each way.
Calgary (YYC) is the most affordable 1-stop option, with an average round-trip price of C$ 444.
What’s the fastest layover option from Ottawa to Chicago?
Shortest average travel time for 1-stop one-way flights from Ottawa to Chicago, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.
Flights via Toronto (YYZ) have the shortest average one-way travel time for 1-stop routes: 4h 20m.
Which airport typically offers the quickest layover for flights from Ottawa to Chicago?
Average layover duration for 1-stop one-way flights from Ottawa to Chicago, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Toronto (YYZ) offer the fastest connection on this route, with an average layover time of 1h 19m.
Reviews of airlines servicing Chicago
Get insights into the airlines that provide service to Chicago. 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 Chicago. Reviews last updated 18 December 2025.
Get a feel of what it's like to fly with Porter Airlines,United Airlines, andAir Canada from Ottawa to Chicago by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
It's good. Planes are new and fresh. WiFi is best and stands out
Related info for your journey
Find useful and relevant information for your journey from Ottawa to Chicago. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
What airport do you fly from for flights from Ottawa to Chicago?
Ottawa (YOW), located 10.6 km from the city centre, is the airport you fly out of when you book flights from Ottawa to Chicago. 3 airlines have flights from Ottawa to Chicago on a regular basis. Booking flights from Ottawa to Chicago should not be difficult; the airport handles an average of 4 outbound flights to Chicago per day.
How long is the flight from Ottawa to Chicago?
Departing from Ottawa to Chicago will take you 4h 05m. There are 1048 km between Ottawa and Chicago.
What are the cheapest airlines flying from Ottawa to Chicago round-trip?
Currently priced at C$ 330, Porter Airlines will fly you from Ottawa to Chicago and back. In addition to Porter Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from United Airlines and Air Canada - these airlines can fly you to your destination from C$ 463 and C$ 490, respectively. You may be able to fly from Ottawa to Chicago for 42% less than the average price by searching for these airlines.
What are the most reliable airlines from Ottawa to Chicago?
The top 3 most reliable airlines when flying from Ottawa to Chicago are SkyWest Airlines (100%), ANA (83%) and United Airlines (80%).
What are the cheapest flights from Ottawa to Chicago?
Looking at all options, your cheapest flight can be booked for C$ 225. While the most popular route (Ottawa - Chicago O'Hare Intl) can be booked for C$ 325 on average, our data indicates C$ 1,448 when flying from Ottawa to Chicago.
Can I find deals for business class flights from Ottawa to Chicago?
Yes. Cheapflights offers flight deals from Ottawa to Chicago 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 Ottawa to Chicago?
Currently, September is the cheapest month in which you can book a flight from Ottawa to Chicago (average of C$ 180). Flying from Ottawa to Chicago in December is currently the most expensive (average of C$ 373). 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.
Explore flights to Chicago departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 18 December 2025.
Discover the top 3 airlines that operate flights from Ottawa to Chicago. 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 629,999 searches. Data last updated 18 December 2025.
Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.
How does Cheapflights help users find flights from Ottawa to Chicago?
When you search for this flight from Ottawa to Chicago, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.
Why should you use Cheapflights to find cheap flight tickets from Ottawa to Chicago?
Cheapflights helps you find that perfect flight to Chicago from Ottawa by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!
Can Cheapflights find flights from Ottawa to Chicago with no change fees?
Users can book flights with no change fees policies with our dedicated filters. Book flights from Ottawa to Chicago flexibly with Cheapflights today.
Can Cheapflights notify me if prices for flights from Ottawa to Chicago become cheaper?
Yes, Cheapflights offers price alerts on Ottawa to Chicago flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.
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