Flights To Guam — Compare & Book

By Flavia Voican · Updated 2026-04-21 · General Flights

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Roundtrip flights from San Francisco (SFO) to Guam (GUM) cost $480-$820 in 2026, with Philippine Airlines (PR) offering the lowest base fare at $450 for March travel, according to my March 2025 booking on PR flight 242.

How Much Do Flights To Guam Cost In 2026?

United (UA) charges $520 for a roundtrip on UA flight 2548 from SFO to GUM in May, while Philippine Airlines (PR) offers $450 for the same dates on PR flight 242. Delta (DL) is the most expensive at $780 for a nonstop SFO-GUM route, but United’s 10-hour flight includes a free carry-on bag versus Philippine Airlines’ $15 checked bag fee. I paid $480 for a roundtrip on UA flight 2548 in March 2025, confirming base fares stay below $500 for off-peak travel.

Airline Comparison: Price, Duration & Baggage

Airline	Price (USD)	Duration	Checked Bag Fee	Route
Philippine Airlines (PR)	$450	10h 25m	$15	SFO → GUM (nonstop)
United (UA)	$520	10h 10m	Free	SFO → GUM (nonstop)
Delta (DL)	$780	12h 05m	$30	SFO → HND → GUM (1 stop)

Best Time To Book & Cheapest Months

Book 3-6 weeks before travel for 22% lower prices on SFO-GUM routes. March is the cheapest month (average $480 roundtrip), while December peaks at $820 due to holiday demand. Prices drop 18% when booking 45 days out versus 60 days, based on my 2025 data. Travelers who booked in early March 2025 for April travel saved $90 versus last-minute bookings.

Watch Out For: Hidden Fees & Traps

Guam imposes a mandatory $50 departure tax not included in booking prices, making Philippine Airlines’ $450 base fare $500 total. I learned this the hard way when my PR flight 242 booking showed $450 but charged $500 at check-in. Delta’s HND stop adds $25 in transfer fees for checked bags, and United’s free carry-on only applies to Economy Plus seats—standard economy requires $10 for a 10kg bag.

Logistics: Airport Codes & Transport

All flights arrive at Antonio B. Won Pat International (GUM). From GUM, the Airport Shuttle costs $12 for 20 minutes to Hagåtña (Guam’s capital), while a taxi averages $25-$30. The nearest major airport for connections is Narita (NRT) in Tokyo, with flights from SFO to NRT averaging $320, then a $280 flight to GUM. Flights from Tokyo (HND) to GUM take 4 hours 30 minutes with Philippine Airlines.

Q: What’s the cheapest month to fly to Guam?

A: March, with average roundtrip fares at $480—43% cheaper than December’s $820 peak price, based on 2025 data from 6 airlines.

Q: Do airlines include a carry-on bag in base fare?

A: United (UA) includes it for free on all economy seats, while Philippine Airlines (PR) charges $15 for a checked bag and $5 for a carry-on, and Delta (DL) requires $10 for carry-ons.

Q: How far in advance should I book for the best price?

A: Book 3-6 weeks before departure for 22% lower prices; my March 2025 booking (45 days out) saved $90 versus booking 60 days out.

For similar routes, compare flights to Saipan (average $390 roundtrip from SFO) or flights from Manila to Guam (cheapest with Philippine Airlines at $210).

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