$588 Cheap Flights from San Francisco (SFO) to Londonderry (LDY)

View $588 flight on Mon, Mar 9, 2026Opens in a new window

Popular airlines from San Francisco Intl. Airport (SFO) to Londonderry (LDY-City of Derry)

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Cheap Flights from San Francisco to Londonderry (SFO-LDY)

Prices were available within the past 7 days and start at $588 for one-way flights and $923 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

British Airways
Mon, Mar 9 - Mon, Mar 16
SFO
San Francisco
LDY
Londonderry
$923 Roundtrip, found 6 days ago
$923
Roundtrip
found 6 days ago
Select British Airways flight, departing Mon, Mar 9 from San Francisco to Londonderry, returning Mon, Mar 16, priced at $923 found 6 days ago
British Airways
Mon, Mar 9 - Mon, Mar 16
SFO
San Francisco
LDY
Londonderry
$924 Roundtrip, found 6 days ago
$924
Roundtrip
found 6 days ago
Select British Airways flight, departing Mon, Mar 9 from San Francisco to Londonderry, returning Mon, Mar 16, priced at $924 found 6 days ago
Aer Lingus
Sat, Mar 7 - Wed, Mar 18
SFO
San Francisco
LDY
Londonderry
$925 Roundtrip, found 6 days ago
$925
Roundtrip
found 6 days ago
Select Aer Lingus flight, departing Sat, Mar 7 from San Francisco to Londonderry, returning Wed, Mar 18, priced at $925 found 6 days ago
United
Sun, Mar 8 - Wed, Mar 18
SFO
San Francisco
LDY
Londonderry
$928 Roundtrip, found 6 days ago
$928
Roundtrip
found 6 days ago
Select United flight, departing Sun, Mar 8 from San Francisco to Londonderry, returning Wed, Mar 18, priced at $928 found 6 days ago
British Airways
Mon, Mar 9 - Mon, Mar 16
SFO
San Francisco
LDY
Londonderry
$936 Roundtrip, found 6 days ago
$936
Roundtrip
found 6 days ago
Select British Airways flight, departing Mon, Mar 9 from San Francisco to Londonderry, returning Mon, Mar 16, priced at $936 found 6 days ago
British Airways
Mon, Mar 9 - Mon, Mar 16
SFO
San Francisco
LDY
Londonderry
$947 Roundtrip, found 6 days ago
$947
Roundtrip
found 6 days ago
Select British Airways flight, departing Mon, Mar 9 from San Francisco to Londonderry, returning Mon, Mar 16, priced at $947 found 6 days ago
Aer Lingus
Sat, Mar 7 - Sat, Mar 14
SFO
San Francisco
LDY
Londonderry
$954 Roundtrip, found 6 days ago
$954
Roundtrip
found 6 days ago
Select Aer Lingus flight, departing Sat, Mar 7 from San Francisco to Londonderry, returning Sat, Mar 14, priced at $954 found 6 days ago
British Airways
Fri, Mar 6 - Fri, Mar 13
SFO
San Francisco
LDY
Londonderry
$977 Roundtrip, found 6 days ago
$977
Roundtrip
found 6 days ago
Select British Airways flight, departing Fri, Mar 6 from San Francisco to Londonderry, returning Fri, Mar 13, priced at $977 found 6 days ago
United
Sat, Mar 7 - Thu, Mar 19
SFO
San Francisco
LDY
Londonderry
$978 Roundtrip, found 6 days ago
$978
Roundtrip
found 6 days ago
Select United flight, departing Sat, Mar 7 from San Francisco to Londonderry, returning Thu, Mar 19, priced at $978 found 6 days ago
Alaska Airlines
Fri, Nov 28 - Sun, Dec 7
SFO
San Francisco
LDY
Londonderry
$991 Roundtrip, found 4 days ago
$991
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Fri, Nov 28 from San Francisco to Londonderry, returning Sun, Dec 7, priced at $991 found 4 days ago
Flights from San Francisco (SFO) to Londonderry (LDY)
Origin airport
San Francisco Intl.
Destination airport
City of Derry
Roundtrip price
$923
Distance
4983 mi

San Francisco to Londonderry Flights

The cheapest times to fly from San Francisco to Londonderry

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 San Francisco to Londonderry are during the month of March. You can find some of the cheapest flights from San Francisco to Londonderry with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from San Francisco to Londonderry

Sunday is one of the best days to book for cheap flights from San Francisco to Londonderry: 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 San Francisco to Londonderry

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 San Francisco to Londonderry in 2025. You can also book with separate airlines for your outbound and return journeys, from $588 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 San Francisco to Londonderry 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 San Francisco to Londonderry 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 San Francisco Intl. Airport (SFO) to City of Derry Airport (LDY) cost?
Lock in a cheap one-way flight from $588 or cheap return flight from $923 from San Francisco Intl. Airport (SFO) to City of Derry Airport (LDY) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from San Francisco Intl. Airport (SFO) to City of Derry Airport (LDY)?
March is the least expensive month to fly from SFO to LDY. Traveling during an off-peak travel window is often the key to finding better fares.
What is the cheapest airline that flies from San Francisco Intl. Airport (SFO) to City of Derry Airport (LDY)?
To find the cheapest airline flying from SFO to LDY, use Expedia's filter tool. Tailor your search based on what matters most to you, such as preferred carriers and flight duration. You can then sort your results by "Price (lowest to highest)" to see the cheapest fares upfront.
How many flights per day from San Francisco Intl. Airport (SFO) to City of Derry Airport (LDY)?
Nonstop flights from San Francisco Intl. Airport (SFO) to City of Derry Airport (LDY) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your travel dates and select either "1 Stop" or "2+ Stops."
What day of the week has the most flights from SFO to LDY?
You'll usually find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from San Francisco Intl. Airport (SFO) to City of Derry Airport (LDY)?
To reach City of Derry Airport (LDY) on time, select a flight that leaves San Francisco Intl. Airport (SFO) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from San Francisco Intl. Airport (SFO) to City of Derry Airport (LDY) last-minute?
Waiting until just before your trip to book a ticket from SFO to LDY generally means paying more. While you may come across some last-minute offers, they're not always guaranteed. Keep your travel plans flexible for a better chance of landing a bargain.
Is it cheaper to book a SFO to LDY flight and hotel package?
You'll generally save money by booking a SFO to LDY flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's easy to manage it all in one convenient place. Once you've selected your preferred accommodations and flights, you can add extras such as activities, tours and car rentals.
Can I cancel or change the date of my flight from San Francisco Intl. Airport (SFO) to City of Derry Airport (LDY)?
If you reserved your SFO to LDY flight in the last 24 hours, you may be able to cancel or modify it without any fees. Depending on the airline and the fare type you purchased, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal for further details.

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*Available to One Key members.