Route brief · SFO → CUN
San Francisco → Cancún
$429
−12% vs typical
seasonal median $490 · difference $61
Oct 16 – Oct 24 · 8 nights
Frontier Airlines1 stop
- Usual monthly lows
- $459–$516
- Board rank
- Stronger than 28%
- Route sample
- 6 observed months
Cached fare — the booking search re-prices live before you pay.
Destination briefCUNCancúnCaribbean blue, Mayan ruins, cenotes — the highest deal-frequency beach route in the Americas.Best windowDec–AprAirportsCancún (CUN)All routes into CancúnWhen this route gets cheap.
Cached-fare history: across 6 months, Oct is the cheapest for SF → CUN. Best time to be there: Dec–Apr.
Fares bottom out in October around $429 and peak in June near $537 — a $108 spread across the 6 months we track. The cheapest itinerary we are tracking makes one stop and takes about 7.5 hours outbound, on a 8-night trip — ticketed under Frontier Airlines, which on a connecting fare need not operate every leg. At $429 for 3,874 km each way, that works out to about $55 per 1,000 km flown. That is above the $39 typical of medium-haul fares here. That puts it in the cheaper half of the 6 routes of similar length we watch out of San Francisco, where the middle fare is $429.
The 6 days we hold a cached fare for
Tap a date → live search
The median cached fare across this calendar is 9% lower than when tracking began on Aug 8 — $523 then versus $476 now, across 6 recorded snapshots. This is a calendar-level trend, so an individual deal above can be lower. The lowest single day we have seen here is $226, on Oct 13.
These are the only days we have a cached price for on this route so far — not the only days it flies. The search above covers any date.
Cheapest in Oct · around $429
12% below the $490 typical fare
Cheapest round-trip fare found per month · San Francisco → Cancún · cached-price history
Route facts
- Airports
- SFO · Oakland (OAK) · San José (SJC) ↔ Cancún (CUN)
- Flight time
- ~7.5 hours outbound
- Distance
- ~3,874 km each way
- Typical price
- $490 round-trip (seasonal median)
- Airlines on the board
- Frontier Airlines
- Itineraries
- Connections on current fares
- Best months to visit
- Dec–Apr
SF → CUN, answered.
Is $429 a good price for San Francisco to Cancún?
Only slightly. The seasonal median is around $490 round-trip and this fare is 12% under it, about $61. We do not call a drop notable until 20%, so this is an ordinary price for the route rather than a reason to hurry.
What is the cheapest month to fly from San Francisco to Cancún?
Across 6 months of cached-fare history, Oct comes out cheapest on this route. The best months to actually be in Cancún are Dec–Apr — when those overlap, that's your window.
How far in advance should I book SF → Cancún?
We do not publish a number for this, because we cannot measure it yet. Answering it honestly means watching the same departure date on this route over many weeks as it approaches, and that archive is still filling up — so any "book N days ahead" figure here would be borrowed from somewhere else rather than measured. What we can measure is which month is cheap: across 6 months of cached fares, Oct comes out lowest on this route. See /guides/what-moves-a-flight-price/ for what does move a fare.
Are there nonstop flights from San Francisco to Cancún?
The current cheapest fares involve a connection, ticketed under Frontier Airlines. Nonstop options exist on many dates at higher prices — check the live search for your exact dates.
Are these prices guaranteed?
No — these are cached fares found on real searches (this one on September 1). Airlines reprice constantly, so the booking search re-checks the live price before you pay. Fresher finds are far more likely to still be available.
Next step
Sleeping in Cancún?
Lock the flight first — then compare stays for Oct 16 – Oct 24 · 8 nights.
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Missed it?
Cached fares expire. This route has a feed of its own — follow it and the next SF → CUN drop reaches you as soon as we find it.
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