Find cheap flights from Belfast Intl Airport to San Francisco

BFS - SFO

Find cheap flights from Belfast Intl Airport to San Francisco

Search hundreds of travel sites at once for deals on flights to San Francisco. Bundle your flight + hotel and save!

Round-trip
Economy
Belfast (BFS)
San Francisco
Fri 9/17
Fri 9/24
Any month
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Include hotels

Good to know

Low season

SeptemberBest time to beat the crowds with an average 23% drop in price.

High season

JanuaryMost popular time to fly with an average 20% increase in price.

Average price round-trip

$657(avg. price over the last 2 weeks)

Good deal one-way

$496or less

When to book flights from Belfast Intl Airport to San Francisco

Estimated round-trip price
Average price per month

Top tips for finding a cheap flight

  • Looking for a cheap flight? 25% of our users found flights on this route for $496 or less one-way.
  • High season is considered to be December, January and February. The cheapest month to fly is September.

FAQs for booking Belfast Intl Airport to San Francisco flights

Can I fly to San Francisco? Are there any travel restrictions when entering San Francisco?

Can I fly to San Francisco without having to quarantine on arrival?

Do I need to take a coronavirus (Covid-19) test before flying to San Francisco?

What documents do I need to fly to San Francisco?

What other coronavirus (Covid-19) restrictions are there in San Francisco?

How long does a flight from Belfast Intl Airport to San Francisco take?

Do I need a passport to fly between Belfast Intl Airport and San Francisco?

How does KAYAK find such low prices on flights from Belfast Intl Airport to San Francisco?

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Belfast Intl Airport to San Francisco?

What is the Hacker Fare option on flights from Belfast Intl Airport to San Francisco?

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Belfast Intl Airport to San Francisco?

COVID-19 information

Safety measures for airlines flying from Belfast Intl Airport to San Francisco

Airlines flying from Belfast Intl Airport to San Francisco have enacted additional safety measures and adjusted policies to better accommodate travelers. Policies vary by airline.

Heightened sanitation

Daily cleaning, installation of cabin HEPA filters on flights from Belfast Intl Airport to San Francisco

Mandatory masks

Masks required on board, masks provided on flights from Belfast Intl Airport to San Francisco

Social distancing seating

Middle seats unavailable to book on flights from Belfast Intl Airport to San Francisco

Pre-flight testing

Testing for antibodies, testing for symptoms for flights from Belfast Intl Airport to San Francisco

Book cheap flights from Belfast Intl Airport to San Francisco

Recent round-trip flight deals

9/23
Thu
2 stops
Multiple Airlines
20h 20m
BFS - SFO
10/4
Mon
2 stops
Multiple Airlines
23h 50m
SFO - BFS
9/23
Thu
3 stops
Multiple Airlines
26h 50m
BFS - SFO
10/4
Mon
2 stops
Multiple Airlines
16h 40m
SFO - BFS
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