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San Francisco to Cancun in December 2026 SFO → CUN

San Francisco International Airport (SFO) → Cancun International Airport (CUN)

For departures in December 2026, the cheapest return found recently is $357 with American Airlines, 1 Dec – 5 Dec, found yesterday. The cheapest one-way found recently is $204 with Southwest Airlines, 5 Dec, found yesterday.

Return

In December 2026, the cheapest return fare on each of 8 departure dates is usually $409 to $471. Across all 12 departure dates we hold on this route, it is usually $392 to $496.

Cheapest return found recently

$357

1 Dec – 5 Dec · American Airlines

San Francisco International Airport (SFO) → Cancun International Airport (CUN)

out 1 stop, back 1 stop

found yesterday

See prices for these datesCheck today's price

It is also the cheapest return we hold, of any age.

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The cheapest dates in December 2026

DatesFromAirlineStopsFound
1 Dec – 5 Dec$357American Airlinesout 1 stop, back 1 stopfound yesterdaySee prices for these dates
8 Dec – 9 Dec$393Southwest Airlinesout 1 stop, back 1 stopfound yesterdaySee prices for these dates
6 Dec – 8 Dec$414American Airlinesout 1 stop, back 1 stopfound yesterdaySee prices for these dates
3 Dec – 8 Dec$440United Airlinesout 1 stop, back 1 stopfound yesterdaySee prices for these dates
4 Dec – 9 Dec$440United Airlinesout 1 stop, back 1 stopfound yesterdaySee prices for these dates

Every date we hold

8 departure dates

1 Dec – 5 Dec: $357, found yesterday2 Dec – 9 Dec: $449, found yesterday3 Dec – 8 Dec: $440, found yesterday4 Dec – 9 Dec: $440, found yesterday6 Dec – 8 Dec: $414, found yesterday8 Dec – 9 Dec: $393, found yesterday24 Dec – 12 Jan 2027: $559, found 2 days ago25 Dec – 9 Jan 2027: $536, found 4 days agoDec
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
1 Dec – 5 Dec$357American AirlinesSan Francisco International Airport (SFO) → Cancun International Airport (CUN)out 1 stop, back 1 stopfound yesterdaySee prices for these dates
2 Dec – 9 Dec$449Air CanadaSan Francisco International Airport (SFO) → Cancun International Airport (CUN)out 1 stop, back 1 stopfound yesterdaySee prices for these dates
3 Dec – 8 Dec$440United AirlinesSan Francisco International Airport (SFO) → Cancun International Airport (CUN)out 1 stop, back 1 stopfound yesterdaySee prices for these dates
4 Dec – 9 Dec$440United AirlinesSan Francisco International Airport (SFO) → Cancun International Airport (CUN)out 1 stop, back 1 stopfound yesterdaySee prices for these dates
6 Dec – 8 Dec$414American AirlinesSan Francisco International Airport (SFO) → Cancun International Airport (CUN)out 1 stop, back 1 stopfound yesterdaySee prices for these dates
8 Dec – 9 Dec$393Southwest AirlinesSan Francisco International Airport (SFO) → Cancun International Airport (CUN)out 1 stop, back 1 stopfound yesterdaySee prices for these dates
24 Dec – 12 Jan 2027$559Frontier AirlinesSan Francisco International Airport (SFO) → Cancun International Airport (CUN)out 2 stops, back 2 stopsfound 2 days agoSee prices for these dates
25 Dec – 9 Jan 2027$536American AirlinesSan Francisco International Airport (SFO) → Cancun International Airport (CUN)out 1 stop, back 1 stopfound 4 days agoSee prices for these dates

Which month looks cheapest?

December 2026 is the cheapest month — from $357.

October 2026From $6301 departure date28 Oct – 29 Nov · found 6 days agoSee prices for these dates
November 2026From $3901 departure date30 Nov – 5 Dec · found yesterdaySee prices for these dates
December 2026From $357Cheapest seen8 departure dates1 Dec – 5 Dec · found yesterdaySee prices for these dates
January 2027From $3882 departure dates4 Jan 2027 – 9 Jan 2027 · found 5 days agoSee prices for these dates

One-way

In December 2026, the cheapest one-way fare on each of 4 departure dates is usually $220 to $233. Across all 7 departure dates we hold on this route, it is usually $166 to $226.

Cheapest one-way found recently

$204

5 Dec · Southwest Airlines

San Francisco International Airport (SFO) → Cancun International Airport (CUN)

1 stop

found yesterday

Open this tripCheck today's price

It is also the cheapest one-way we hold, of any age.

FareTell may earn a commission when you book through a partner.

The cheapest dates in December 2026

DatesFromAirlineStopsFound
5 Dec$204Southwest Airlines1 stopfound yesterdayOpen this trip
6 Dec$225American Airlines1 stopfound yesterdayOpen this trip
4 Dec$227American Airlines1 stopfound yesterdayOpen this trip
3 Dec$251United Airlines1 stopfound yesterdayOpen this trip

Every date we hold

4 departure dates

3 Dec: $251, found yesterday4 Dec: $227, found yesterday5 Dec: $204, found yesterday6 Dec: $225, found yesterdayDec
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
3 Dec$251United AirlinesSan Francisco International Airport (SFO) → Cancun International Airport (CUN)1 stopfound yesterdayOpen this trip
4 Dec$227American AirlinesSan Francisco International Airport (SFO) → Cancun International Airport (CUN)1 stopfound yesterdayOpen this trip
5 Dec$204Southwest AirlinesSan Francisco International Airport (SFO) → Cancun International Airport (CUN)1 stopfound yesterdayOpen this trip
6 Dec$225American AirlinesSan Francisco International Airport (SFO) → Cancun International Airport (CUN)1 stopfound yesterdayOpen this trip

Which month looks cheapest?

November 2026 is the cheapest month — from $164.

November 2026From $164Cheapest seen1 departure date15 Nov · found 6 days agoOpen this trip
December 2026From $2044 departure dates5 Dec · found yesterdayOpen this trip
January 2027From $1662 departure dates8 Jan 2027 · found yesterdayOpen this trip

Prices are what travelers' searches on Aviasales found in the last 7 days, in US dollars: the price the seller showed on Aviasales; bags may cost extra. Fares change, so check today's price before you book. How our prices work