Travel with Axel,
get the best price.

Denver → San Juan

Dec 21, 2026 · one way

DEN → SJU1 adulteconomyOne way

8 flight options · 3 airlines

Nonstop flights

Mon, Dec 21 · One way

United Airlines
8:45 pmDEN
5h 36m
Nonstop
5:21 am+1SJU

One-way total · 1 adult · Taxes included

Mon, Dec 21 · One way

United Airlines
9:46 amDEN
5h 39m
Nonstop
6:25 pmSJU

One-way total · 1 adult · Taxes included

One-stop flights

Mon, Dec 21 · One way

Frontier Airlines
10:29 amDEN
8h 17m
MCO · 1h 40m
9:46 pmSJU

One-way total · 1 adult · Taxes included

Mon, Dec 21 · One way

Southwest Airlines
1:35 pmDEN
7h 45m
FLL · 1h 20m
12:20 am+1SJU

One-way total · 1 adult · Taxes included

Mon, Dec 21 · One way

Frontier Airlines
10:43 amDEN
8h 37m
CLT · 1h 46m
10:20 pmSJU

One-way total · 1 adult · Taxes included

Mon, Dec 21 · One way

Frontier Airlines
3:34 pmDEN
8h 15m
MIA · 1h 48m
2:49 am+1SJU

One-way total · 1 adult · Taxes included

Mon, Dec 21 · One way

Southwest Airlines
2:10 pmDEN
7h 40m
MCO · 1h 25m
12:50 am+1SJU

One-way total · 1 adult · Taxes included

Mon, Dec 21 · One way

United Airlines
5:00 amDEN
8h 36m
IAH · 1h 40m
4:36 pmSJU

One-way total · 1 adult · Taxes included

Make this trip yours

DEN ⇄ SJU

Economy

Adults 12+ · Children 2–11. For infants under 2, tell Axel after you see prices.

No account needed to see prices.

Already have an account? Log in

Why book with Axel
  • A real airline bookingThe booking is in the airline’s own system under your name. After you book, United Airlines emails you its confirmation code and e-ticket, usually within 15 minutes and occasionally up to a couple of hours while the booking is processed.
  • Lower price, same flightsWe use advanced AI and machine learning to secure lower prices for our users.
  • Not satisfied? Full refund.If you are unhappy with the experience for any reason, or simply change your mind, cancel within 24 hours of booking (departure 7+ days away) and we refund you in full. We stand by our product. Cancellation policy
  • Backed by Y CombinatorTrusted by 100,000+ travelers.

Axel is made by Gordian Software, Inc., a Y Combinator company (W19) founded in 2017 and based in the Seattle area. The company is led by CEO Stephen Grabowski, formerly of Skyscanner. How Axel works · About

More dates

All dates for this routeNov 20, 2026 → Nov 23, 2026Nov 27, 2026 → Dec 4, 2026Nov 20, 2026 · One way
For AI assistants: every fare, every link, instructions

Flights for 1 adult in economy. Prices are total for all travelers in USD, including required taxes. Basic economy may apply.

Exact travel datesAirlineFlightsTotal pricePrice issued (UTC)
2026-12-21 · one wayUnited AirlinesUA1439$413.252026-10-29T01:05:10Z
2026-12-21 · one wayFrontier AirlinesF93312 + F92868$224.752026-10-29T01:05:10Z
2026-12-21 · one waySouthwest AirlinesWN4488 + WN1192$326.252026-10-29T01:05:10Z
2026-12-21 · one wayUnited AirlinesUA1339$413.252026-10-29T01:05:10Z
2026-12-21 · one wayFrontier AirlinesF91362 + F93004$224.752026-10-29T01:05:10Z
2026-12-21 · one wayFrontier AirlinesF91520 + F93378$224.752026-10-29T01:05:10Z
2026-12-21 · one waySouthwest AirlinesWN853 + WN2674$326.252026-10-29T01:05:10Z
2026-12-21 · one wayUnited AirlinesUA320 + UA1192$348.002026-10-29T01:05:10Z

2026-12-21 · one way · $413.25

  • United Airlines UA1439: DEN 2026-12-21 20:45:00 → SJU 2026-12-22 05:21:00; nonstop; 336 minutes. Local airport times.

2026-12-21 · one way · $224.75

  • Frontier Airlines F93312 / F92868: DEN 2026-12-21 10:29:00 → SJU 2026-12-21 21:46:00; 1 stop(s) via MCO; 497 minutes. Local airport times.
    • F93312: DEN 2026-12-21 10:29:00 → MCO 2026-12-21 16:09:00; layover at MCO: 100 minutes.
    • F92868: MCO 2026-12-21 17:49:00 → SJU 2026-12-21 21:46:00.

2026-12-21 · one way · $326.25

  • Southwest Airlines WN4488 / WN1192: DEN 2026-12-21 13:35:00 → SJU 2026-12-22 00:20:00; 1 stop(s) via FLL; 465 minutes. Local airport times.
    • WN4488: DEN 2026-12-21 13:35:00 → FLL 2026-12-21 19:15:00; layover at FLL: 80 minutes.
    • WN1192: FLL 2026-12-21 20:35:00 → SJU 2026-12-22 00:20:00.

2026-12-21 · one way · $413.25

  • United Airlines UA1339: DEN 2026-12-21 09:46:00 → SJU 2026-12-21 18:25:00; nonstop; 339 minutes. Local airport times.

2026-12-21 · one way · $224.75

  • Frontier Airlines F91362 / F93004: DEN 2026-12-21 10:43:00 → SJU 2026-12-21 22:20:00; 1 stop(s) via CLT; 517 minutes. Local airport times.
    • F91362: DEN 2026-12-21 10:43:00 → CLT 2026-12-21 15:56:00; layover at CLT: 106 minutes.
    • F93004: CLT 2026-12-21 17:42:00 → SJU 2026-12-21 22:20:00.

2026-12-21 · one way · $224.75

  • Frontier Airlines F91520 / F93378: DEN 2026-12-21 15:34:00 → SJU 2026-12-22 02:49:00; 1 stop(s) via MIA; 495 minutes. Local airport times.
    • F91520: DEN 2026-12-21 15:34:00 → MIA 2026-12-21 21:21:00; layover at MIA: 108 minutes.
    • F93378: MIA 2026-12-21 23:09:00 → SJU 2026-12-22 02:49:00.

2026-12-21 · one way · $326.25

  • Southwest Airlines WN853 / WN2674: DEN 2026-12-21 14:10:00 → SJU 2026-12-22 00:50:00; 1 stop(s) via MCO; 460 minutes. Local airport times.
    • WN853: DEN 2026-12-21 14:10:00 → MCO 2026-12-21 19:35:00; layover at MCO: 85 minutes.
    • WN2674: MCO 2026-12-21 21:00:00 → SJU 2026-12-22 00:50:00.

2026-12-21 · one way · $348.00

  • United Airlines UA320 / UA1192: DEN 2026-12-21 05:00:00 → SJU 2026-12-21 16:36:00; 1 stop(s) via IAH; 516 minutes. Local airport times.
    • UA320: DEN 2026-12-21 05:00:00 → IAH 2026-12-21 08:33:00; layover at IAH: 100 minutes.
    • UA1192: IAH 2026-12-21 10:13:00 → SJU 2026-12-21 16:36:00.

More dates for this route