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Cheap flights from San Francisco (SFO) to Shannon (SNN) from $620

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/11. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
SFO — SNN
May 21 — May 281
From?
To?
Tue 5/21
Tue 5/28
1 adult, Economy
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The best prices from San Francisco to Shannon are usually found in March or November, booked 89 days in advance, depart on a Wednesday or Friday and return on a Monday

Cheap flight deals from San Francisco to Shannon

Discover tips and strategies to find the most affordable flight options for your journey from San Francisco (SFO) to Shannon (SNN). 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 May 16, 2024.

Popular in

December

Cheapest in

March

Average price

$993

Round-trip from

$533
High demand for flights, 22% potential price rise
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Best time to find cheap flights, 27% potential price drop
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Average for round-trip flights in May 2024
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From San Francisco to Shannon
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What is the cheapest day to fly round-trip from San Francisco to Shannon?

Users have found that leaving on a Tuesday can be a cost-effective option. It’s possible to save up to 32% on your flight compared to booking on days when demand is much higher.

How far in advance should I book a flight from San Francisco to Shannon?

To save up to 1% on this flight, we recommend booking at least 29 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from San Francisco to Shannon from $750 1-2 weeks out and tickets from $1,365 for flights departing within the next 72 hours.

What is the cheapest month to fly from San Francisco to Shannon?

Flights from San Francisco to Shannon lean towards being more expensive in December. Prices are generally better when you fly from San Francisco to Shannon in March, with the cheapest ticket starting at $694.

When is the cheapest time to fly from San Francisco to Shannon (SFO - SNN)?

It’s optimal to fly from San Francisco to Shannon in the afternoon. By choosing this option you can save up to 18% on the cost of your flight, compared to a flight in the morning.

Cheap American Airlines flights from San Francisco to Shannon

Explore cheap flight options specifically provided by American Airlines for the route between San Francisco and Shannon. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,637,452 searches. Data last updated May 16, 2024.
Check out some of the cheapest American Airlines flights we've come across from San Francisco to Shannon. Come back soon if you're not finding the exact deal you're looking for.
Mon 8/269:14 amSFO - SNN
2 stops18h 06mAmerican Airlines
Thu 9/57:40 amSNN - SFO
2 stops20h 47mAmerican Airlines
Deal found 5/15$669
Thu 7/45:45 amSFO - SNN
2 stops15h 50mAmerican Airlines
Tue 8/61:45 pmSNN - SFO
2 stops16h 54mAmerican Airlines
Deal found 5/15$1,027
Fri 8/305:45 amSFO - SNN
2 stops15h 50mAmerican Airlines
Sun 9/81:45 pmSNN - SFO
2 stops18h 29mAmerican Airlines
Deal found 5/15$1,029
Mon 7/16:15 amSFO - SNN
1 stop15h 50mAmerican Airlines
Sat 8/32:50 pmSNN - SFO
1 stop27h 02mAmerican Airlines
Deal found 5/15$1,038
Wed 7/31:10 pmSFO - SNN
1 stop32h 55mAmerican Airlines
Sat 8/32:50 pmSNN - SFO
1 stop27h 02mAmerican Airlines
Deal found 5/15$1,049
Wed 7/31:06 pmSFO - SNN
2 stops19h 04mAmerican Airlines
Mon 8/51:45 pmSNN - SFO
2 stops18h 30mAmerican Airlines
Deal found 5/15$1,150
Fri 7/511:31 pmSFO - SNN
2 stops22h 04mAmerican Airlines
Wed 8/71:45 pmSNN - SFO
2 stops16h 54mAmerican Airlines
Deal found 5/15$1,156
Sat 6/2910:12 pmSFO - SNN
1 stop23h 53mAmerican Airlines
Sat 7/132:50 pmSNN - SFO
1 stop17h 22mAmerican Airlines
Deal found 5/15$1,177
Sat 5/256:07 amSFO - SNN
2 stops15h 28mAmerican Airlines
Sat 6/17:40 amSNN - SFO
2 stops20h 21mAmerican Airlines
Deal found 5/16$1,642

Cheap Delta flights from San Francisco to Shannon

Explore cheap flight options specifically provided by Delta for the route between San Francisco and Shannon. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,637,452 searches. Data last updated May 16, 2024.
Browse through some of the cheapest Delta flights traveling from San Francisco to Shannon. Deals frequently update to provide users with more options.
Wed 9/46:00 amSFO - SNN
1 stop20h 50mDelta
Sat 9/2812:50 pmSNN - SFO
1 stop16h 40mDelta
Deal found 5/15$670
Thu 9/2610:17 amSFO - SNN
2 stops16h 33mDelta
Mon 9/3012:50 pmSNN - SFO
2 stops18h 36mDelta
Deal found 5/14$675
Sun 7/710:50 pmSFO - SNN
1 stop28h 00mDelta
Wed 8/712:50 pmSNN - SFO
1 stop16h 47mDelta
Deal found 5/15$755
Sun 7/74:00 pmSFO - SNN
1 stop34h 50mDelta
Wed 8/712:50 pmSNN - SFO
2 stops18h 27mDelta
Deal found 5/15$759
Sun 7/79:27 pmSFO - SNN
1 stop29h 23mDelta
Sun 8/412:50 pmSNN - SFO
1 stop20h 29mDelta
Deal found 5/15$805
Sun 7/710:50 pmSFO - SNN
1 stop28h 00mDelta
Sun 8/412:50 pmSNN - SFO
2 stops19h 11mDelta
Deal found 5/15$809
Wed 7/241:40 pmSFO - SNN
1 stop13h 10mDelta
Sun 8/412:50 pmSNN - SFO
1 stop20h 29mDelta
Deal found 5/16$824
Sun 7/710:50 pmSFO - SNN
1 stop28h 00mDelta
Tue 8/612:50 pmSNN - SFO
2 stops18h 43mDelta
Deal found 5/15$922
Sun 7/710:50 pmSFO - SNN
1 stop28h 00mDelta
Tue 8/612:50 pmSNN - SFO
1 stop20h 27mDelta
Deal found 5/15$964

Cheap San Francisco to Shannon flights in May & June 2024

Find cheap flight options from San Francisco to Shannon specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,637,452 searches. Prices were last updated on May 16, 2024.
These are some of the best deals we've found on flights to Shannon in 2024 at this time. For more flight deals, be sure to check back very soon.
Sun 6/3012:12 amSFO - SNN
1 stop23h 18mUnited Airlines
Mon 7/229:30 amSNN - SFO
1 stop31h 15mUnited Airlines
Deal found 5/15$836
Sun 6/3012:12 amSFO - SNN
1 stop23h 18mUnited Airlines
Mon 7/229:30 amSNN - SFO
2 stops23h 26mUnited Airlines
Deal found 5/15$879
Wed 6/121:10 amSFO - SNN
1 stop22h 20mUnited Airlines
Thu 6/209:30 amSNN - SFO
1 stop17h 30mUnited Airlines
Deal found 5/15$967
Thu 6/136:45 amSFO - SNN
1 stop16h 45mUnited Airlines
Thu 6/2012:30 pmSNN - SFO
2 stops18h 35mUnited Airlines
Deal found 5/15$972
Mon 6/171:10 amSFO - SNN
1 stop22h 20mUnited Airlines
Tue 7/169:30 amSNN - SFO
1 stop17h 25mUnited Airlines
Deal found 5/15$977
Tue 6/188:25 amSFO - SNN
2 stops15h 05mUnited Airlines
Tue 7/169:30 amSNN - SFO
2 stops19h 01mUnited Airlines
Deal found 5/15$982
Sat 6/296:30 amSFO - SNN
1 stop17h 00mUnited Airlines
Sat 7/1312:30 pmSNN - SFO
2 stops28h 15mUnited Airlines
Deal found 5/15$1,032
Fri 6/145:00 amSFO - SNN
2 stops18h 30mUnited Airlines
Fri 6/219:30 amSNN - SFO
3 stops20h 24mUnited Airlines
Deal found 5/14$1,164
Thu 6/131:10 amSFO - SNN
2 stops25h 20mUnited Airlines
Fri 6/2112:30 pmSNN - SFO
1 stop16h 54mUnited Airlines
Deal found 5/14$1,172

San Francisco to Shannon 2024 flight deals

Discover exclusive flight deals for travel between San Francisco and Shannon in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,637,452 searches. Data last updated May 16, 2024.
These are some of the best deals we've found on flights to Shannon in 2024 at this time. For more flight deals, be sure to check back very soon.
Mon 8/269:14 amSFO - SNN
2 stops18h 06mAmerican Airlines
Thu 9/57:40 amSNN - SFO
2 stops20h 47mAmerican Airlines
Deal found 5/15$669
Wed 9/46:00 amSFO - SNN
1 stop20h 50mDelta
Sat 9/2812:50 pmSNN - SFO
1 stop16h 40mDelta
Deal found 5/15$670
Thu 9/2610:17 amSFO - SNN
2 stops16h 33mDelta
Mon 9/3012:50 pmSNN - SFO
1 stop16h 40mDelta
Deal found 5/14$675
Wed 9/46:05 amSFO - SNN
2 stops20h 45mKLM
Sat 9/2812:50 pmSNN - SFO
2 stops31h 23mKLM
Deal found 5/16$690
Sun 7/710:50 pmSFO - SNN
1 stop28h 00mDelta
Wed 8/712:50 pmSNN - SFO
1 stop16h 47mDelta
Deal found 5/15$755
Sun 7/74:00 pmSFO - SNN
1 stop34h 50mDelta
Wed 8/712:50 pmSNN - SFO
2 stops18h 27mDelta
Deal found 5/15$759
Sun 7/79:27 pmSFO - SNN
1 stop29h 23mDelta
Sun 8/412:50 pmSNN - SFO
1 stop20h 29mDelta
Deal found 5/15$805
Sun 7/74:00 pmSFO - SNN
1 stop34h 50mDelta
Mon 8/512:50 pmSNN - SFO
2 stops18h 43mDelta
Deal found 5/15$809
Fri 8/305:15 amSFO - SNN
1 stop18h 15mUnited Airlines
Sun 9/89:30 amSNN - SFO
1 stop15h 36mUnited Airlines
Deal found 5/15$824

San Francisco to Shannon flights leaving soon

Find last-minute flight options from San Francisco to Shannon for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 2,637,452 searches. Data last updated May 16, 2024.
Have a look at some of the last-minute flights available departing from San Francisco to Shannon. Tip: verify your flight details before completing your reservation.
Sat 5/2510:38 amSFO - SNN
1 stop12h 52mUnited Airlines
Sat 6/112:30 pmSNN - SFO
1 stop16h 54mUnited Airlines
Deal found 5/16$1,362
Sat 5/256:00 amSFO - SNN
2 stops20h 30mUnited Airlines
Sat 6/112:30 pmSNN - SFO
1 stop16h 54mUnited Airlines
Deal found 5/16$1,367
Sat 5/256:07 amSFO - SNN
2 stops15h 28mAmerican Airlines
Sat 6/17:40 amSNN - SFO
2 stops20h 21mAmerican Airlines
Deal found 5/16$1,642

One-way flights to Shannon from San Francisco

Search for one-way flight options from San Francisco to Shannon. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 2,637,452 searches. Data last updated May 16, 2024.
Some of the best available deals we've found on one-way flights from San Francisco to Shannon. For those needing a return trip from San Francisco, there is a search form available above.
Tue 6/112:53 pmSFO - SNN
3 stops45h 42mMultiple Airlines
Deal found 5/16$620
Mon 6/102:42 pmSFO - SNN
3 stops41h 28mMultiple Airlines
Deal found 5/16$625
Wed 6/127:50 amSFO - SNN
2 stops19h 30mMultiple Airlines
Deal found 5/16$632
Sun 6/97:40 pmSFO - SNN
2 stops36h 30mMultiple Airlines
Deal found 5/16$633
Mon 6/107:40 pmSFO - SNN
2 stops36h 30mMultiple Airlines
Deal found 5/16$641
Tue 6/111:43 pmSFO - SNN
2 stops22h 52mMultiple Airlines
Deal found 5/16$642
Fri 6/282:42 pmSFO - SNN
2 stops37h 08mMultiple Airlines
Deal found 5/16$645
Thu 6/62:42 pmSFO - SNN
3 stops41h 03mMultiple Airlines
Deal found 5/16$650
Fri 6/2811:59 pmSFO - SNN
3 stops36h 36mMultiple Airlines
Deal found 5/16$698

Find flights from San Francisco to Shannon within your budget

Customize your flight search to find flights from San Francisco to Shannon 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 2,637,452 searches. Data last updated May 16, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$669 - $1,477

Route

Depart

Return

Price

San FranciscoShannon

SFO - SNN

SFOSNN

San Francisco

Mon 8/26

2 stops18h 06m

Shannon

Thu 9/5

2 stops20h 47m

$669

San FranciscoShannon

SFO - SNN

SFOSNN

San Francisco

Wed 9/4

1 stop20h 50m

Shannon

Sat 9/28

1 stop16h 40m

$670

San FranciscoShannon

SFO - SNN

SFOSNN

San Francisco

Thu 9/26

2 stops16h 33m

Shannon

Mon 9/30

2 stops18h 36m

$675

San FranciscoShannon

SFO - SNN

SFOSNN

San Francisco

Wed 9/4

2 stops20h 45m

Shannon

Sat 9/28

2 stops31h 23m

$690

San FranciscoShannon

SFO - SNN

SFOSNN

San Francisco

Fri 8/30

1 stop17h 10m

Shannon

Sun 9/8

2 stops16h 04m

$829

San FranciscoShannon

SFO - SNN

SFOSNN

San Francisco

Mon 7/1

2 stops19h 00m

Shannon

Tue 8/6

1 stop23h 50m

$1,356

San FranciscoShannon

SFO - SNN

SFOSNN

San Francisco

Fri 7/5

2 stops27h 55m

Shannon

Sat 8/3

1 stop16h 52m

$1,392

San FranciscoShannon

SFO - SNN

SFOSNN

San Francisco

Sun 7/7

2 stops25h 37m

Shannon

Thu 8/8

2 stops21h 47m

$1,471

San FranciscoShannon

SFO - SNN

SFOSNN

San Francisco

Sun 7/7

2 stops21h 12m

Shannon

Fri 8/9

2 stops33h 25m

$1,477

Flights are sorted by cheapest first

Deals found on 5/15

When is the best time to book a flight from San Francisco to Shannon?

Use this chart to determine the optimal time to book a round-trip flight from San Francisco to Shannon. Price data was last updated on May 10, 2024.
Booking 87 days in advance of your planned departure date is, on average, the best time to get cheap flights from San Francisco to Shannon. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
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When is the cheapest time to fly from San Francisco to Shannon?

Use this chart to determine the cheapest time to fly round-trip from San Francisco to Shannon. Price data was last updated on May 12, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their San Francisco to Shannon flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
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Average price of flights to Shannon by month

Plan your trip from San Francisco to Shannon by taking into account the cheapest months to travel. The average price of a one-way flight from San Francisco to Shannon is currently $643 while a round-trip flight costs $1,025. Price data was last updated on May 12, 2024.

Currently, February is the cheapest month in which you can book a flight from San Francisco to Shannon (average of $533). Flying from San Francisco to Shannon in June is currently the most expensive (average of $1,027). 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.

January

$620

February

$533

March

$611

April

$694

May

$825

June

$1,027

July

$1,020

August

$895

September

$816

October

$660

November

$574

December

$648

Temperature and rainfall in Shannon by month

Plan your trip to Shannon by taking into account the average temperature and rainfall totals by month.

SNN

Temperature

42.8 - 60.8 °F

Reviews of airlines servicing Shannon

Get insights into the airlines that provide service to Shannon. 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 Shannon. Reviews last updated May 16, 2024.
Read reviews from past customers who have flown American Airlines, Delta and United Airlines from San Francisco to Shannon. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
10,673 reviews
Check prices

Crew

8.6

Overall

8.0

Comfort

7.9

Food

7.4

Entertainment

8.0

Boarding

8.2

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

Delta
8.0
Very good
10,673 reviews
Delta
8.0
Very good
10,673 reviews
Check prices

Crew

8.6

Overall

8.0

Comfort

7.9

Food

7.4

Entertainment

8.0

Boarding

8.2

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

KLM
7.9
Good
1,568 reviews
Delta
8.0
Very good
10,673 reviews
Check prices

Crew

8.6

Overall

8.0

Comfort

7.9

Food

7.4

Entertainment

8.0

Boarding

8.2

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

United Airlines
7.4
Good
10,924 reviews
Delta
8.0
Very good
10,673 reviews
Check prices

Crew

8.6

Overall

8.0

Comfort

7.9

Food

7.4

Entertainment

8.0

Boarding

8.2

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

American Airlines
7.3
Good
14,514 reviews
Delta
8.0
Very good
10,673 reviews
Check prices

Crew

8.6

Overall

8.0

Comfort

7.9

Food

7.4

Entertainment

8.0

Boarding

8.2

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

Air Canada
7.0
Good
6,947 reviews
Delta
8.0
Very good
10,673 reviews
Check prices

Crew

8.6

Overall

8.0

Comfort

7.9

Food

7.4

Entertainment

8.0

Boarding

8.2

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

Related info for your journey

Find useful and relevant information for your journey from San Francisco to Shannon. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • Can I find flights from San Francisco to Shannon for under $700 on Cheapflights?

    Yes, there are multiple flights from San Francisco to Shannon for under $700. The cheapest flight booked recently is on American Airlines for just $669, but on average you can expect to pay $839.

  • Are there last-minute flights available from San Francisco to Shannon for under $1,400?

    There are currently 3+ open flights from San Francisco to Shannon within the next 7 days for less than $1,400.

  • What are the cheapest airlines flying from San Francisco to Shannon round-trip?

    Our cheapest airline available from San Francisco to Shannon is American Airlines. Our recent data shows that you can find tickets from as low as $669 on this airline. Additional options worth looking into are Delta and KLM, starting at $670 and $690 round-trip. American Airlines is priced at 32% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from San Francisco to Shannon one-way?

    One-way options have recently been found by users for as low as $796 on United Airlines. Other airlines that offer cheap prices include Delta from $799 and American Airlines from $847 one-way.

  • What are the most popular airlines that fly from San Francisco to Shannon?

    The most popular airlines flying from San Francisco to Shannon are American Airlines, British Airways and Delta. Something to consider prior to booking your flight.

  • What does SFO to SNN mean?

    This is defined as San Francisco Airport (SFO) and Shannon Airport (SNN). Codes like Shannon Airport are often used to just call airports uniquely.

  • Can I find deals for flights from San Francisco to Shannon that include extra baggage allowance?

    The amount of baggage you can bring on your San Francisco to Shannon flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from San Francisco to Shannon with specific airlines?

    Yes, Cheapflights allows you to browse and filter San Francisco to Shannon flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from San Francisco to Shannon that include hotel bookings?

    Yes. In addition to deals on San Francisco to Shannon flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from San Francisco to Shannon?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Francisco to Shannon.

  • Can I find deals for business class flights from San Francisco to Shannon?

    Yes. Cheapflights offers flight deals from San Francisco to Shannon by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from San Francisco to Shannon that allow pets onboard?

    Many airlines flying from San Francisco to Shannon offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from San Francisco to Shannon?

    Yes, you can often find last-minute deals on San Francisco to Shannon flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the San Francisco to Shannon flight deals updated?

    The San Francisco to Shannon flight deals you see on this page were last updated on 5/16.

See more FAQs

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Top 5 airlines flying from San Francisco to Shannon

Discover the top 5 airlines that operate flights from San Francisco to Shannon. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,637,452 searches. Data last updated May 16, 2024.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$614Average$846FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Aer LingusCheapest$713Average$1,255FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
British AirwaysCheapest$723Average$886FlexibilityNo cancel feeOn-time70%
Search British Airways flights
DeltaCheapest$724Average$981FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
United AirlinesCheapest$749Average$1,133FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
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Search flights from San Francisco to Shannon by cabin class

Find flights from San Francisco to Shannon, based on your preferred cabin class, be it economy, premium economy, business, or first class.
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How does Cheapflights help users find flights from San Francisco to Shannon?

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Why should you use Cheapflights to find cheap flight tickets from San Francisco to Shannon?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Shannon from San Francisco.

Can Cheapflights find flights from San Francisco to Shannon with no change fees?

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

Can Cheapflights notify me if prices for flights from San Francisco to Shannon become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Shannon from San Francisco today and book when prices fit your budget.

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