$322 Cheap Flights from Chicago (ORD) to Belfast (BFS)

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Chicago to Belfast Flights

The cheapest times to fly from Chicago to Belfast

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Chicago to Belfast are during the month of April. You can find some of the cheapest flights from Chicago to Belfast with Expedia's search tool and vast selection of airlines.

The best time to book a flight from Chicago to Belfast

Sunday is one of the best days to book for cheap flights from Chicago to Belfast: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

How to find cheap round-trip tickets from Chicago to Belfast

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Chicago to Belfast in 2026. You can also book with separate airlines for your outbound and return journeys, from $322 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Chicago to Belfast flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

You could also save big by booking one of Expedia's vacation packages. Bundling together your Chicago to Belfast airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

*Terms apply.

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

Frequently Asked Questions

How much does a flight from Chicago, IL (ORD-O'Hare Intl.) to Belfast (BFS-Belfast Intl.) cost?

You can find cheap one-way flights from $322 and cheap return flights $822 Chicago, IL (ORD-O'Hare Intl.) to Belfast (BFS-Belfast Intl.) with Expedia. Return flights typically cost between $869 and $3405. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Chicago, IL (ORD-O'Hare Intl.) to Belfast (BFS-Belfast Intl.) ticket fares go up or down.

*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.

What is the cheapest month to fly from Chicago, IL (ORD-O'Hare Intl.) to Belfast (BFS-Belfast Intl.)?

The cheapest month to fly from ORD to BFS is April when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you're able to. Use the calendar view in your search to see which months have low fares on this route.

Which airlines fly direct from Chicago, IL (ORD-O'Hare Intl.) to Belfast (BFS-Belfast Intl.)?

Enter ORD to BFS and your travel dates, then apply the 'Nonstop' filter to see only direct flights.

What is the cheapest airline that flies from Chicago, IL (ORD-O'Hare Intl.) to Belfast (BFS-Belfast Intl.)?

KLM is one of the cheapest airlines offering connecting flights from O'Hare Intl. (ORD) to Belfast Intl. (BFS), with round-trip tickets starting from around $1,041 with a layover in Roissy-Charles de Gaulle (CDG). This option provides a great way to explore both cities. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.

*Prices based on flights available on Expedia in the last year.

How do I find cheap flights from Chicago, IL (ORD-O'Hare Intl.) to Belfast (BFS-Belfast Intl.)?

To find a cheap flight from Chicago, IL (ORD-O'Hare Intl.) to Belfast (BFS-Belfast Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.

What is the best time to fly from Chicago, IL (ORD-O'Hare Intl.) to Belfast (BFS-Belfast Intl.)?

The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.

What is the earliest flight from Chicago, IL (ORD-O'Hare Intl.) to Belfast (BFS-Belfast Intl.)?

You can catch the earliest flight from O'Hare International Airport (ORD) to Belfast International Airport (BFS) at around 6:05 AM. This seasonal service is available in November, allowing you to start your adventure early in the day. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.

What day of the week has the most flights from Chicago, IL (ORD-O'Hare Intl.) to Belfast (BFS-Belfast Intl.)?

You'll usually find the most flights from O'Hare Intl. (ORD) to Belfast Intl. (BFS) on a Sunday, with around 34 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include American Airlines, British Airways, and Delta.

What are the most popular departure times for flights from Chicago, IL (ORD-O'Hare Intl.) to Belfast (BFS-Belfast Intl.)?

The most popular departure times for flights from Chicago (ORD) to Belfast (BFS) are in the late afternoon, from 3pm to 6pm. This time frame accounts for around 46% of total traffic. Many major carriers, including British Airways, operate during this window, making it a favored choice for travelers.

Can you fly business or first class from Chicago, IL (ORD-O'Hare Intl.) to Belfast (BFS-Belfast Intl.)?

Business class seats are offered on the ORD to BFS route with British Airways and KLM.

How do I earn miles on a Chicago, IL (ORD-O'Hare Intl.) to Belfast (BFS-Belfast Intl.) flight with Expedia?

It's easy to earn miles on a Chicago, IL (ORD-O'Hare Intl.) to Belfast (BFS-Belfast Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.

*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.

What airports do you fly into for Belfast from O'Hare Intl. (ORD)?

When traveling from O'Hare Intl. (ORD) to Belfast, you can fly into George Best Belfast City (BHD) and Belfast Intl. (BFS). Some flights may connect through major hubs like Pearson Intl. (YYZ), Detroit Metropolitan Wayne County (DTW), DUB (DUB) before reaching Belfast. Compare routes and airports on Expedia to find the best flight options for your travel plans.

Is it cheaper to buy a plane ticket from Chicago, IL (ORD-O'Hare Intl.) to Belfast (BFS-Belfast Intl.) at the last minute?

Typically, booking a last minute flight from Chicago, IL (ORD-O'Hare Intl.) to Belfast (BFS-Belfast Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.

Is it cheaper to book a Chicago, IL (ORD-O'Hare Intl.) to Belfast (BFS-Belfast Intl.) flight and hotel package?

Securing a Chicago, IL (ORD-O'Hare Intl.) to Belfast (BFS-Belfast Intl.) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.

Can I cancel or change the date of my flight from Chicago, IL (ORD-O'Hare Intl.) to Belfast (BFS-Belfast Intl.)?

If you booked your Chicago, IL (ORD-O'Hare Intl.) to Belfast (BFS-Belfast Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.