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prices we've seen · United States fares · USD

Flights from San Francisco (SFO) to Cancun (CUN)

  • One way from $178
  • Round trip from $378
  • Nonstop on 6 of 6 dates
  • Fastest 5h 13m
  • 4 airlines

The cheapest one-way fare from San Francisco (SFO) to Cancun (CUN) we have seen is $178 USD, departing Dec 5, 2026 (seen Nov 5, 2026): Frontier F9 4402, 2 stops, 26h 43m.

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Prices are the fare alone; the seller shows the bag and fare rules.

Cheapest by month

Checked Nov 11

Pick a month to search the day its cheapest fare leaves.

  1. Nov 2026$205
  2. Dec 2026$178
  3. Jan 2027—
  4. Feb 2027—
  5. Mar 2027—
  6. Apr 2027$252

Cheapest days to fly one wayCheapest round trips

Each day's cheapest fare we've seen, nonstop and with stops. Cheapest first.

We may earn a commission from the seller · How we rank

  1. SatDec 5

    20:32

    26h 43m2 stops

    02:15+2

    Cheapest$178 USD

    Frontier F9 4402 · seen Nov 5

    Go to seller — $178

  2. MonDec 28

    18:51

    17h 56m1 stop

    15:47+1

    $185 USD

    American Airlines AA 901 · seen Nov 4

    Go to seller — $185

  3. SunNov 15

    22:20

    12h 21m1 stop

    13:41+1

    $205 USD

    Frontier F9 1448 · seen Nov 10

    Go to seller — $205

  4. SatNov 14

    22:20

    12h 21m1 stop

    13:41+1

    $252 USD

    Frontier F9 1448 · seen Nov 10

    Go to seller — $252

  5. SunNov 15

    23:00

    5h 13mNonstop

    07:13+1

    $313 USD

    United UA 1145 · seen Nov 10

    Go to seller — $313

  6. MonDec 28

    23:00

    5h 13mNonstop

    07:13+1

    $317 USD

    United UA 1145 · seen Nov 4

    Go to seller — $317

  7. SatNov 14

    06:41

    5h 19mNonstop

    15:00

    $328 USD

    United UA 1054 · seen Nov 10

    Go to seller — $328

  8. SatDec 5

    08:45

    5h 23mNonstop

    17:08

    $346 USD

    United UA 1679 · seen Nov 5

    Go to seller — $346

  9. TueNov 10

    23:00

    5h 13mNonstop

    07:13+1

    $493 USD

    United UA 1145 · seen Nov 10

    Go to seller — $493

  10. ThuNov 19

    08:45

    5h 23mNonstop

    17:08

    $768 USD

    United UA 1679 · seen Nov 11

    Go to seller — $768

The cheapest round trips we've seen on this route, on any dates, cheapest first.

We may earn a commission from the seller · How we rank

  1. 21 nightsDec 7–28

    08:45

    17:08

    Cheapest$378 USD

    United UA 1679 · 1 stop · 14h 32m in all, both ways · seen Nov 4

    Go to seller — $378

  2. 7 nightsJan 6–13

    00:31

    CUN

    $396 USD

    American Airlines AA 1506 · 2 stops · 18h 1m in all, both ways · seen Nov 8

    Go to seller — $396

  3. 6 nightsDec 2–8

    05:35

    CUN

    $396 USD

    American Airlines AA 402 · 2 stops · 23h 58m in all, both ways · seen Nov 10

    Go to seller — $396

  4. 7 nightsDec 11–18

    23:14

    CUN

    $431 USD

    Frontier F9 1448 · 2 stops · 41h 39m in all, both ways · seen Nov 9

    Go to seller — $431

  5. 7 nightsDec 31 – Jan 7

    22:24

    CUN

    $517 USD

    Aeromexico AM 665 · 2 stops · 22h 18m in all, both ways · seen Nov 5

    Go to seller — $517

  6. 7 nightsJan 6–13

    23:00

    07:13+1

    $561 USD

    United UA 1145 · Nonstop · 11h 20m in all, both ways · seen Nov 8

    Go to seller — $561

  7. 6 nightsDec 2–8

    08:45

    17:08

    $564 USD

    United UA 1679 · Nonstop · 11h 26m in all, both ways · seen Nov 10

    Go to seller — $564

  8. 6 nightsDec 24–30

    08:44

    CUN

    $648 USD

    Frontier F9 4158 · 4 stops · 48h 2m in all, both ways · seen Nov 9

    Go to seller — $648

  9. 7 nightsDec 11–18

    08:45

    17:08

    $664 USD

    United UA 1679 · Nonstop · 11h 30m in all, both ways · seen Nov 9

    Go to seller — $664

  10. 7 nightsDec 31 – Jan 7

    23:00

    07:13+1

    $716 USD

    United UA 1145 · Nonstop · 11h 20m in all, both ways · seen Nov 5

    Go to seller — $716
Show 3 more fares

  1. 4 nightsNov 25–29

    21:11

    CUN

    $748 USD

    Frontier F9 4156 · 4 stops · 66h 28m in all, both ways · seen Nov 6

    Go to seller — $748

  2. 6 nightsDec 24–30

    23:00

    07:13+1

    $941 USD

    United UA 1145 · Nonstop · 11h 16m in all, both ways · seen Nov 9

    Go to seller — $941

  3. 4 nightsNov 25–29

    23:00

    07:13+1

    $970 USD

    United UA 1145 · Nonstop · 11h 20m in all, both ways · seen Nov 6

    Go to seller — $970

Compare other routes

Compared with San Francisco → Cancun: $178 one way (Dec 5).

Other places from San Francisco

Every route from San Francisco →

To Cancun from other cities

Every route to Cancun →

Airlines seen on this route

  • American Airlines
  • Aeromexico
  • Frontier
  • United

Marketing carriers; the operating airline is shown by the seller.

San Francisco to Cancun in numbers

  • By month, Dec 2026 is the cheapest we've seen at $178 USD and Apr 2027 the most expensive at $252 USD — a spread of 42%.
  • Nonstop fares were seen on 6 of the 6 departure dates; carriers seen: American Airlines, Aeromexico, Frontier, United.
  • SFO serves San Francisco, United States; CUN serves Cancun, Mexico.
  • Cancun runs 3 hours ahead of San Francisco.

Questions

What is the cheapest fare from San Francisco (SFO) to Cancun (CUN)?

The cheapest one-way fare from San Francisco (SFO) to Cancun (CUN) we have seen is $178 USD, departing Dec 5, 2026 (seen Nov 5, 2026): Frontier F9 4402, 2 stops, 26h 43m.

Is there a nonstop flight from San Francisco (SFO) to Cancun (CUN)?

Nonstop fares were seen on 6 of the 6 departure dates; carriers seen: American Airlines, Aeromexico, Frontier, United.

Which month is cheapest to fly from San Francisco (SFO) to Cancun (CUN)?

By month, Dec 2026 is the cheapest we've seen at $178 USD and Apr 2027 the most expensive at $252 USD — a spread of 42%.

How old is this price?

It is the cheapest fare we've seen for that date; the date beside it is the day it was seen, or our last check. We look again at least once a day for the routes people search, and stop showing a route's prices two days after our last look. The seller's page shows the price right now.

How does a2bflight rank results?

By price and duration only; commission never enters the order. Cheapest means cheapest among the fares we've seen for this route. A click that books may earn a2bflight a commission from the seller; the price you see is the seller's own. See how we rank and what we keep.