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Cheap flights from St. Louis to Belfast from £645

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/10. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BHD
6 Apr — 13 Apr1
1 adult

Cheap flight deals from St. Louis to Belfast

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Belfast (BF1). 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 1 April 2025.

Round-trip from

£843
British Airways
  • British Airways
  • 14/7-21/7
  • 4 total stops
  • 46h 26m total
  • St. Louis to Belfast
Search Deals

Find flight deals from St. Louis to Belfast

Cheapest flights from St. Louis to Belfast
Explore the most affordable flight options available from St. Louis to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 1 April 2025.

Fri 10/1018:05STL - BHD
2 stops18h 10mIberia
Sat 18/1007:05BHD - STL
2 stops16h 58mIberia
Deal found 31/3£645
Mon 14/716:52STL - BHD
2 stops16h 48mBritish Airways
Mon 21/719:30BHD - STL
2 stops29h 38mBritish Airways
Deal found 31/3£843
Fri 10/1006:35STL - BHD
3 stops26h 00mAer Lingus
Sat 18/1009:50BHD - STL
3 stops19h 35mAer Lingus
Deal found 31/3£1,221
Mon 14/717:27STL - BHD
2 stops18h 03mMultiple Airlines
Mon 21/709:50BHD - STL
3 stops19h 59mMultiple Airlines
Deal found 31/3£1,620

Cheapflights Fare Finder

Customise your flight search to find flights from St. Louis to Belfast 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 858,174 searches. Data last updated 1 April 2025.
Use the filters below to find and compare flights from St. Louis to Belfast that are best for you.

Fly from

St. Louis

Fly to

Belfast

Route

Depart

Return

Price

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 14/7

16:52-15:40

2 stops16h 48m

Belfast City

Mon 21/7

19:30-19:08

2 stops29h 38m

£843

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 14/7

17:27-17:30

2 stops18h 03m

Belfast City

Mon 21/7

09:50-23:49

3 stops19h 59m

£1,620

Flights are sorted by cheapest return flights first.

Deals found on 31/3

Best time to book a flight from St. Louis to Belfast

Have a flexible travel schedule? Discover the best time to fly to Belfast from St. Louis with our price prediction graph.
Estimated return 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 St. Louis to Belfast

Rainfall in Belfast by month

Plan your trip to Belfast by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Belfast ranges from 50.0 - 90.0 inches per month. October is typically the wettest month, when rainfall can reach 90.0 mm. April is typically the driest time to visit Belfast when rainfall is around 50.0 mm.

Temperature in Belfast by month

Plan your trip to Belfast by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Belfast, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 16.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 5.0 C).

Reviews of airlines servicing Belfast

Get insights into the airlines that provide service to Belfast. 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 Belfast. Reviews last updated 1 April 2025.
British Airways
6.6
Okay
6,713 reviews
Check prices

Crew

7.5

Boarding

6.8

Food

6.3

Overall

6.6

Comfort

6.7

Entertainment

6.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,Mar 2025

ORD - LHR

Plane was delayed 2 hours. We were charged extra for luggage and seats. Seat rows were so close together that it was almost impossible to get in and out to use the bathroom, let alone sit comfortably. Food was mediocre at best. Your ambient music is the same tune that is used when AA puts me on hold. Flying has become a nightmare!
British Airways
6.6
Okay
6,713 reviews
British Airways
6.6
Okay
6,713 reviews
Check prices

Crew

7.5

Boarding

6.8

Food

6.3

Overall

6.6

Comfort

6.7

Entertainment

6.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,Mar 2025

ORD - LHR

Plane was delayed 2 hours. We were charged extra for luggage and seats. Seat rows were so close together that it was almost impossible to get in and out to use the bathroom, let alone sit comfortably. Food was mediocre at best. Your ambient music is the same tune that is used when AA puts me on hold. Flying has become a nightmare!

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Belfast. 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 St. Louis to Belfast?

    Most people fly from Lambert-St Louis (STL) if they book a flight from St. Louis to Belfast. On average, Lambert-St Louis has 0 outbound flights to Belfast per day from 0 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

  • What is the cheapest airline to fly from St. Louis to Belfast round-trip?

    Currently priced at £843, British Airways will fly you from St. Louis to Belfast and back. In addition to British Airways, many other airlines offer competitively priced options for your trip.

  • Can I find deals for flights from St. Louis to Belfast that include hotel bookings?

    Yes. In addition to deals on St. Louis to Belfast flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Belfast?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Belfast.

  • Can I find deals for business class flights from St. Louis to Belfast?

    Yes. Cheapflights offers flight deals from St. Louis to Belfast 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 St. Louis to Belfast?

    Currently, January is the cheapest month in which you can book a flight from St. Louis to Belfast (average of £67). Flying from St. Louis to Belfast in July is currently the most expensive (average of £90). 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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Alternative routes for St. Louis to Belfast

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How does Cheapflights help users find flights from St. Louis to Belfast?

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Can Cheapflights find flights from St. Louis to Belfast with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from St. Louis to Belfast, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from St. Louis to Belfast become cheaper?

Of course! You can now track prices for flights from St. Louis to Belfast and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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