$3,161+ Cheap flights from Missouri to Belfast Intl (BFS)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/19. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BFS
Jan 2 — Jan 91
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Missouri to Belfast Intl with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Missouri to Belfast Intl
Best flights from Missouri to Belfast IntlDiscover carefully curated flight deals from Missouri to Belfast Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 3, 2025.
Discover carefully curated flight deals from Missouri to Belfast Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 3, 2025.
This Mytrip deal was found by Cheapflights users on 12/2. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/194:05 pmSTL - BFS
2 stops16h 35mMultiple Airlines
Tue 3/319:25 pmBFS - STL
2 stops22h 05mMultiple Airlines
Deal found 12/2![Multiple Airlines logo]()
$3,161
Find flight deals from Missouri to Belfast Intl
Keep the following information in mind while searching for Missouri to Belfast Intl flight deals. Data was last updated December 3, 2025.
Round-trip from | $3,161 (Mytrip) |
|---|
Cheapflights Fare Finder
Customize your flight search to find flights from Missouri to Belfast Intl 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 December 3, 2025.
Use the filters below to find and compare flights from Missouri to Belfast Intl Airport that are best for you.
Fly from
Missouri
Fly to
Belfast Intl
Route
Depart
Return
Price
St. LouisBelfast
STL - BFS
STLBFS
Lambert-St Louis
Thu 3/19
4:05 pm-1:40 pm
2 stops16h 35m
Belfast Intl
Tue 3/31
9:25 pm-1:30 pm
2 stops22h 05m
$3,161
Best time to book a flight from Missouri to Belfast Intl
Have a flexible travel schedule? Discover the best time to fly to Belfast Intl from Missouri 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 Missouri to Belfast Intl Airport
What is the cheapest time of day to fly from MO to BFS?
Find hourly flight availability from Missouri to Belfast Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 3, 2025.
When flying from Missouri to Belfast Intl Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 24% versus a flight at noon.