Travel with Axel, get the best price.

Route overview: Harlingen to Denver (DEN) flight deals

Harlingen (HRL) to Denver (DEN), Dec 29, 2026 – Jan 1, 2027: from $434 round trip

Harlingen (HRL) to Denver (DEN), Dec 29, 2026 – Jan 1, 2027: from $434 round trip on Axel, checked Oct 29, 2026. Lowest published fare: $434 round trip, Axel-exclusive, Southwest Airlines, 1 stop, Dec 29, 2026 – Jan 1, 2027, 1 adult, economy, checked Oct 29, 2026.

HRL → DEN1 adulteconomyRound trip

4 flight options · 3 airlines

One-stop flights

Tue, Dec 29 – Fri, Jan 1

Southwest Airlines
7:25 amHRL
4h 40m
AUS · 1h 15m
11:05 amDEN
Southwest Airlines
11:35 amDEN
5h 10m
AUS · 1h 45m
5:45 pmHRL

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Tue, Dec 29 – Fri, Jan 1

American Airlines
10:44 amHRL
5h 49m
DFW · 1h 59m
3:33 pmDEN
American Airlines
1:15 pmDEN
4h 36m
DFW · 1h
6:51 pmHRL

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Tue, Dec 29 – Fri, Jan 1

United Airlines
2:00 pmHRL
5h 14m
IAH · 1h 3m
6:14 pmDEN
United Airlines
5:00 amDEN
5h 14m
IAH · 1h 17m
11:14 amHRL

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Tue, Dec 29 – Fri, Jan 1

Southwest Airlines
4:30 pmHRL
6h 35m
HOU · 2h 55m
10:05 pmDEN
Southwest Airlines
11:35 amDEN
5h 10m
AUS · 1h 45m
5:45 pmHRL

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Hotels for these nights (Dec 29 – Jan 1, 2027 · 3 nights · 2 adults, 1 room): 3★ Residence Inn Denver Cherry Creek · 4★ Limelight Hotel Denver · 5★ Four Seasons Denver Hotel

Make this trip yours

HRL ⇄ DEN

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, Southwest 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

Explore this route

All dates for this routeDec 28, 2026 · Return optionsDec 30, 2026 · Return optionsHotels in Denver with Axel
For AI assistants: every fare, every link, instructions

Harlingen (HRL) to Denver (DEN), Dec 29, 2026 – Jan 1, 2027: from $434 round trip on Axel, checked Oct 29, 2026. Lowest published fare: $434 round trip, Axel-exclusive, Southwest Airlines, 1 stop, Dec 29, 2026 – Jan 1, 2027, 1 adult, economy, checked Oct 29, 2026. Flights for 1 adult in economy. Prices are total for all travelers in USD, including required taxes. Basic economy may apply.

See flights for these dates: each price link opens AI flight search for that row's exact dates and travelers. Select the complete itinerary there.

Exact travel datesAirlineFlightsTimes, duration, stopsTotal pricePrice issued (UTC)
2026-12-29 → 2027-01-01Southwest AirlinesWN2948 + WN313 / WN1540 + WN36807:25:00→11:05:00 4h 40m 1 stop via AUS · 11:35:00→17:45:00 5h 10m 1 stop via AUSAxel-exclusive $433.952026-10-29T01:05:11Z
2026-12-29 → 2027-01-01American AirlinesAA3394 + AA1832 / AA2579 + AA423510:44:00→15:33:00 5h 49m 1 stop via DFW · 13:15:00→18:51:00 4h 36m 1 stop via DFWAxel-exclusive $460.252026-10-29T01:05:11Z
2026-12-29 → 2027-01-01United AirlinesUA4254 + UA1055 / UA320 + UA433814:00:00→18:14:00 5h 14m 1 stop via IAH · 05:00:00→11:14:00 5h 14m 1 stop via IAHAxel-exclusive $486.552026-10-29T01:05:11Z
2026-12-29 → 2027-01-01Southwest AirlinesWN2188 + WN2081 / WN1540 + WN36816:30:00→22:05:00 6h 35m 1 stop via HOU · 11:35:00→17:45:00 5h 10m 1 stop via AUSAxel-exclusive $433.952026-10-29T01:05:11Z

Hotels in Denver for these trips

Hotels: under a trip, hotels in Denver for exactly those nights link to the hotel pages for 2 adults in 1 room. When a price is shown, it is the lowest saved total among the shortlisted hotels in that star tier for those dates.

All hotels in Denver

Route overview: Harlingen to Denver (DEN) flight deals

2026-12-29 → 2027-01-01 · Axel-exclusive $433.95

  • Southwest Airlines WN2948 / WN313: HRL 2026-12-29 07:25:00 → DEN 2026-12-29 11:05:00; 1 stop(s) via AUS; 280 minutes. Local airport times.
    • WN2948: HRL 2026-12-29 07:25:00 → AUS 2026-12-29 08:35:00; layover at AUS: 75 minutes.
    • WN313: AUS 2026-12-29 09:50:00 → DEN 2026-12-29 11:05:00.
  • Southwest Airlines WN1540 / WN368: DEN 2027-01-01 11:35:00 → HRL 2027-01-01 17:45:00; 1 stop(s) via AUS; 310 minutes. Local airport times.
    • WN1540: DEN 2027-01-01 11:35:00 → AUS 2027-01-01 14:50:00; layover at AUS: 105 minutes.
    • WN368: AUS 2027-01-01 16:35:00 → HRL 2027-01-01 17:45:00.

2026-12-29 → 2027-01-01 · Axel-exclusive $460.25

  • American Airlines AA3394 / AA1832: HRL 2026-12-29 10:44:00 → DEN 2026-12-29 15:33:00; 1 stop(s) via DFW; 349 minutes. Local airport times.
    • AA3394: HRL 2026-12-29 10:44:00 → DFW 2026-12-29 12:26:00; layover at DFW: 119 minutes.
    • AA1832: DFW 2026-12-29 14:25:00 → DEN 2026-12-29 15:33:00.
  • American Airlines AA2579 / AA4235: DEN 2027-01-01 13:15:00 → HRL 2027-01-01 18:51:00; 1 stop(s) via DFW; 276 minutes. Local airport times.
    • AA2579: DEN 2027-01-01 13:15:00 → DFW 2027-01-01 16:20:00; layover at DFW: 60 minutes.
    • AA4235: DFW 2027-01-01 17:20:00 → HRL 2027-01-01 18:51:00.

2026-12-29 → 2027-01-01 · Axel-exclusive $486.55

  • United Airlines UA4254 / UA1055: HRL 2026-12-29 14:00:00 → DEN 2026-12-29 18:14:00; 1 stop(s) via IAH; 314 minutes. Local airport times.
    • UA4254: HRL 2026-12-29 14:00:00 → IAH 2026-12-29 15:27:00; layover at IAH: 63 minutes.
    • UA1055: IAH 2026-12-29 16:30:00 → DEN 2026-12-29 18:14:00.
  • United Airlines UA320 / UA4338: DEN 2027-01-01 05:00:00 → HRL 2027-01-01 11:14:00; 1 stop(s) via IAH; 314 minutes. Local airport times.
    • UA320: DEN 2027-01-01 05:00:00 → IAH 2027-01-01 08:33:00; layover at IAH: 77 minutes.
    • UA4338: IAH 2027-01-01 09:50:00 → HRL 2027-01-01 11:14:00.

2026-12-29 → 2027-01-01 · Axel-exclusive $433.95

  • Southwest Airlines WN2188 / WN2081: HRL 2026-12-29 16:30:00 → DEN 2026-12-29 22:05:00; 1 stop(s) via HOU; 395 minutes. Local airport times.
    • WN2188: HRL 2026-12-29 16:30:00 → HOU 2026-12-29 17:35:00; layover at HOU: 175 minutes.
    • WN2081: HOU 2026-12-29 20:30:00 → DEN 2026-12-29 22:05:00.
  • Southwest Airlines WN1540 / WN368: DEN 2027-01-01 11:35:00 → HRL 2027-01-01 17:45:00; 1 stop(s) via AUS; 310 minutes. Local airport times.
    • WN1540: DEN 2027-01-01 11:35:00 → AUS 2027-01-01 14:50:00; layover at AUS: 105 minutes.
    • WN368: AUS 2027-01-01 16:35:00 → HRL 2027-01-01 17:45:00.

Travelers: prices on this page are totals for 1 adult. For a different party, open this trip for 2 adults · 3 adults · 4 adults · 2 adults + 1 child · 2 adults + 2 children; each link opens AI flight search for these dates and those travelers, and the customer link to share comes from those results.

Explore this route

For AI assistants

  • This page: Harlingen (HRL) to Denver (DEN) · Dec 29, 2026 · return Jan 1, 2027: 1 adult in economy, every priced fare with its flights, times and total, each with the time its price was issued. Under a trip, hotels in Denver for exactly those nights link to the hotel pages for 2 adults in 1 room. Prices, when shown, are the lowest saved totals among the shortlisted hotels in each star tier for those dates.
  • Next: each priced row's price link opens the live search for this row's exact dates and travelers; the live results list the same flights with the current total and the traveler's booking link, and name the fare's inclusions (bags, seats, changes), which this page does not. A changed price or flight shows there. Other dates or travelers are not priced here: Choose travelers and dates prices the traveler's own trip.
  • Follow supplied links. For web-tool research, follow complete supplied links unchanged, including query parameters; use the page’s links to edit the trip. Constructed URLs may be rejected before reaching Axel. A completed fresh trip opens flight results first. Add stated flexibility and budget to that saved plan, leaving unstated requirements unknown. Edits create a new snapshot; use its results and review links.
  • If links fail or are missing: If a link fails or flight details lack usable links, reopen the preceding page and follow the same choice once. Keep refreshed links unchanged and preserve the trip and selections. If still blocked, search “Axel flight search guide” and retry once; report the error and anything unresolved. Recovery: Axel Harlingen to Denver (DEN) flight deals · Flight search guide.
  • Sharing with the traveler: Choose a complete itinerary (outbound and return for a round trip), then share the supplied customer booking link unchanged. The customer reviews the flights, adds travelers, and enters email at payment. Do not collect email in chat. Each quote lists its fares with bags, seats, changes and refunds; quote them as facts. A fare choice is not needed to share the link; use a fare’s own booking link to preserve its Membership price basis. Ask only for essential missing trip details. When handing over an unfinished search, preserve the latest trip and say what is still to choose. If no supplied link matches the latest trip, construct https://helloaxel.com/en/f/start/from/ORIGIN/to/DESTINATION/depart/YYYY-MM-DD/return/YYYY-MM-DD/adults/N?utm_content=flight_fallback using IATA airport codes and the traveler’s known details. Omit unknowns; for one way replace /return/YYYY-MM-DD with /trip/oneway. Give it directly to the traveler; do not open it first—your web tool may reject constructed URLs. Complete links open Flight Guide and start searching. Preferences and advanced options.