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Cheap flights from Illinois to Belfast from $322

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to Belfast departing on 9/28. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Illinois to Belfast

Cheap round-trip flights

Multiple Airlines Logo
1:26 pm - 11:10 pmSTL-BFS
27h 44m2 stops
Multiple Airlines Logo
6:45 am - 10:04 pmBFS-STL
21h 19m2 stops
$583Multiple Airlines
Find Deal
Mon, Sep 29 - Tue, Oct 7
Multiple Airlines Logo
9:15 pm - 10:45 pmORD-BFS
20h 30m3 stops
Multiple Airlines Logo
10:20 pm - 3:00 pmBFS-ORD
46h 40m3 stops
$726Multiple Airlines
Find Deal
Fri, Oct 31 - Mon, Nov 10
Multiple Airlines Logo
9:15 pm - 10:45 pmORD-BFS
20h 30m3 stops
Multiple Airlines Logo
9:30 pm - 2:45 pmBFS-ORD
47h 15m3 stops
$733Multiple Airlines
Find Deal
Fri, Oct 31 - Fri, Nov 7
Multiple Airlines Logo
6:30 am - 8:25 pmORD-BFS
31h 55m2 stops
Multiple Airlines Logo
4:25 pm - 4:30 pmBFS-ORD
30h 05m3 stops
$760Multiple Airlines
Find Deal
Mon, Sep 29 - Thu, Oct 2
Multiple Airlines Logo
8:40 am - 5:10 pmORD-BFS
26h 30m3 stops
Multiple Airlines Logo
4:25 pm - 4:30 pmBFS-ORD
30h 05m3 stops
$784Multiple Airlines
Find Deal
Sat, Sep 27 - Thu, Oct 2
Multiple Airlines Logo
8:40 pm - 10:00 pmORD-BFS
20h 20m2 stops
Multiple Airlines Logo
7:05 am - 5:55 pmBFS-ORD
16h 50m2 stops
$817Multiple Airlines
Find Deal
Fri, Oct 31 - Fri, Nov 7
Multiple Airlines Logo
6:30 am - 8:20 pmORD-BFS
31h 50m2 stops
Multiple Airlines Logo
4:25 pm - 4:30 pmBFS-ORD
30h 05m3 stops
$827Multiple Airlines
Find Deal
Sun, Sep 28 - Thu, Oct 2
Multiple Airlines Logo
7:25 pm - 10:20 pmORD-BFS
20h 55m2 stops
Multiple Airlines Logo
5:20 pm - 12:35 pmBFS-ORD
25h 15m2 stops
$836Multiple Airlines
Find Deal
Sun, Sep 28 - Wed, Oct 1
Multiple Airlines Logo
6:45 pm - 3:10 pmORD-BFS
15h 25m2 stops
Multiple Airlines Logo
9:30 pm - 2:45 pmBFS-ORD
47h 15m3 stops
$840Multiple Airlines
Find Deal
Fri, Oct 31 - Fri, Nov 7
Multiple Airlines Logo
8:40 pm - 10:00 pmORD-BFS
20h 20m2 stops
Multiple Airlines Logo
10:20 pm - 3:00 pmBFS-ORD
46h 40m3 stops
$841Multiple Airlines
Find Deal
Fri, Oct 31 - Mon, Nov 10

momondo Fare Finder

 
Customize your flight search to find flights from Illinois to Belfast Intl Airport 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, momondo users made 832,500 searches. Data last updated September 17, 2025.
Use the filters below to find and compare flights from Illinois to Belfast Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Mon 9/29

1:26 pm-11:10 pm

2 stops27h 44m

Belfast Intl

Tue 10/7

6:45 am-10:04 pm

2 stops21h 19m

$583

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Fri 10/31

9:15 pm-10:45 pm

3 stops20h 30m

Belfast Intl

Mon 11/10

10:20 pm-3:00 pm

3 stops46h 40m

$726

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Fri 10/31

9:15 pm-10:45 pm

3 stops20h 30m

Belfast Intl

Fri 11/7

9:30 pm-2:45 pm

3 stops47h 15m

$733

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Mon 9/29

6:30 am-8:25 pm

2 stops31h 55m

Belfast Intl

Thu 10/2

4:25 pm-4:30 pm

3 stops30h 05m

$760

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sat 9/27

8:40 am-5:10 pm

3 stops26h 30m

Belfast Intl

Thu 10/2

4:25 pm-4:30 pm

3 stops30h 05m

$784

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Fri 10/31

8:40 pm-10:00 pm

2 stops20h 20m

Belfast Intl

Fri 11/7

7:05 am-5:55 pm

2 stops16h 50m

$817

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sun 9/28

6:30 am-8:20 pm

2 stops31h 50m

Belfast Intl

Thu 10/2

4:25 pm-4:30 pm

3 stops30h 05m

$827

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sun 9/28

7:25 pm-10:20 pm

2 stops20h 55m

Belfast Intl

Wed 10/1

5:20 pm-12:35 pm

2 stops25h 15m

$836

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Fri 10/31

6:45 pm-3:10 pm

2 stops15h 25m

Belfast Intl

Fri 11/7

9:30 pm-2:45 pm

3 stops47h 15m

$840

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Fri 10/31

8:40 pm-10:00 pm

2 stops20h 20m

Belfast Intl

Mon 11/10

10:20 pm-3:00 pm

3 stops46h 40m

$841

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 resultsSorted by cheapest first
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See travel insights to Belfast from

How to get the cheapest flight ticket from Illinois to Belfast Intl Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Belfast Intl Airport?

The cheapest day to depart on your flight to Belfast Intl Airport is on a Wednesday when prices can be found for as low as $649. This is often the case because there is less demand to fly during this day of the week. When flying out on a Thursday, the most expensive travel day of the week, you can expect to see flight prices from Illinois to Belfast Intl Airport for around $938.

What is the cheapest time of day to depart on your flight to Belfast Intl Airport?

In the evening is the cheapest time of day to fly from Illinois to Belfast Intl Airport when you can find flight prices for as low as $769. Flying to Belfast Intl Airport in the evening is an ideal time because this is during off-peak travel hours. In contrast, the most expensive time of day to depart to Belfast Intl Airport is in the afternoon when prices are around $804.

Cheap Illinois to Belfast Intl Airport flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to Belfast Intl Airport

Direct flights

None
There are no direct flights from Illinois to Belfast Intl Airport. There are no popular flight routes from Illinois to Belfast Intl Airport.
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  • When did momondo last update prices for flights from Illinois to Belfast Intl Airport?

    Prices for flights from Illinois to Belfast Intl Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Illinois to Belfast Intl Airport?

  • How old do you have to be to fly from Illinois to Belfast Intl Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Illinois to Belfast Intl Airport.

  • What documentation or ID do you need to fly to Belfast Intl Airport?

    The travel and health documents you'll need for your trip to Belfast Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Belfast Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from Illinois to Belfast Intl Airport

Compare and see reviews for airlines that fly from Illinois to Belfast Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
British AirwaysPriceFrom $577Free CancellationRating
6.7
7,367 reviews
Search British Airways flights

Traveling to a place near Belfast?

Book flights to Belfast if you plan to visit one of these locations
Newry
Armagh
Cookstown
Dungannon

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to Belfast?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Illinois to Belfast. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Illinois to Belfast with flexible booking policies on momondo?

Flights from Illinois to Belfast with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Illinois to Belfast?

momondo helps you find the best flight between Illinois and Belfast by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Illinois to Belfast right now. Can momondo alert me if prices change?

Price alerts on flights to Belfast from Illinois are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your Belfast Intl Airport trip

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