Travel with Axel,
get the best price.

Route overview: Denver to Sydney (SYD) flight deals

Denver → Sydney

Dec 17, 2026 · return Dec 20, 2026

DEN → SYD1 adulteconomyRound trip

5 flight options · 2 airlines

One-stop flights

Thu, Dec 17 – Sun, Dec 20

United Airlines
7:15 pmDEN
19h 50m
LAX · 1h 44m
9:05 am+2SYD
United Airlines
11:50 amSYD
18h 19m
SFO · 2h
12:09 pmDEN

Round-trip total · 1 adult · Taxes included

Thu, Dec 17 – Sun, Dec 20

American Airlines
6:46 pmDEN
20h 14m
LAX · 2h 10m
9:00 am+2SYD
United Airlines
11:50 amSYD
18h 19m
SFO · 2h
12:09 pmDEN

Round-trip total · 1 adult · Taxes included

Thu, Dec 17 – Sun, Dec 20

United Airlines
3:53 pmDEN
21h 2m
YVR · 1h 56m
6:55 am+2SYD
United Airlines
11:50 amSYD
18h 19m
SFO · 2h
12:09 pmDEN

Round-trip total · 1 adult · Taxes included

Thu, Dec 17 – Sun, Dec 20

United Airlines
3:35 pmDEN
21h 25m
IAH · 1h 17m
7:00 am+2SYD
United Airlines
11:50 amSYD
18h 19m
SFO · 2h
12:09 pmDEN

Round-trip total · 1 adult · Taxes included

Thu, Dec 17 – Sun, Dec 20

United Airlines
3:50 pmDEN
20h 30m
SFO · 2h 21m
6:20 am+2SYD
United Airlines
11:50 amSYD
18h 19m
SFO · 2h
12:09 pmDEN

Round-trip total · 1 adult · Taxes included

Make this trip yours

DEN ⇄ SYD

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

Explore this route

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.

Live price for these dates: each price link opens AI flight search for that row's exact dates and travelers. Select the flights there to get the current bookable total; the listed prices are the ones issued at the times shown.

Route overview: Denver to Sydney (SYD) flight deals

Exact travel datesAirlineFlightsTotal pricePrice issued (UTC)
2026-12-17 → 2026-12-20United AirlinesUA1368 + UA839 / UA870 + UA1068$1903.502026-10-29T01:05:09Z
2026-12-17 → 2026-12-20American Airlines / United AirlinesAA6281 + AA73 / UA870 + UA1068$1918.502026-10-29T01:05:09Z
2026-12-17 → 2026-12-20United AirlinesUA1086 + AC37 / UA870 + UA1068$1903.502026-10-29T01:05:09Z
2026-12-17 → 2026-12-20United AirlinesUA489 + UA101 / UA870 + UA1068$1903.502026-10-29T01:05:09Z
2026-12-17 → 2026-12-20United AirlinesUA2633 + UA829 / UA870 + UA1068$1903.502026-10-29T01:05:09Z

2026-12-17 → 2026-12-20 · $1903.50

  • United Airlines UA1368 / UA839: DEN 2026-12-17 19:15:00 → SYD 2026-12-19 09:05:00; 1 stop(s) via LAX; 1190 minutes. Local airport times.
    • UA1368: DEN 2026-12-17 19:15:00 → LAX 2026-12-17 20:56:00; layover at LAX: 104 minutes.
    • UA839: LAX 2026-12-17 22:40:00 → SYD 2026-12-19 09:05:00.
  • United Airlines UA870 / UA1068: SYD 2026-12-20 11:50:00 → DEN 2026-12-20 12:09:00; 1 stop(s) via SFO; 1099 minutes. Local airport times.
    • UA870: SYD 2026-12-20 11:50:00 → SFO 2026-12-20 06:30:00; layover at SFO: 120 minutes.
    • UA1068: SFO 2026-12-20 08:30:00 → DEN 2026-12-20 12:09:00.

2026-12-17 → 2026-12-20 · $1918.50

  • American Airlines AA6281 / AA73: DEN 2026-12-17 18:46:00 → SYD 2026-12-19 09:00:00; 1 stop(s) via LAX; 1214 minutes. Local airport times.
    • AA6281: DEN 2026-12-17 18:46:00 → LAX 2026-12-17 20:30:00; layover at LAX: 130 minutes.
    • AA73: LAX 2026-12-17 22:40:00 → SYD 2026-12-19 09:00:00.
  • United Airlines UA870 / UA1068: SYD 2026-12-20 11:50:00 → DEN 2026-12-20 12:09:00; 1 stop(s) via SFO; 1099 minutes. Local airport times.
    • UA870: SYD 2026-12-20 11:50:00 → SFO 2026-12-20 06:30:00; layover at SFO: 120 minutes.
    • UA1068: SFO 2026-12-20 08:30:00 → DEN 2026-12-20 12:09:00.

2026-12-17 → 2026-12-20 · $1903.50

  • United Airlines UA1086 / AC37: DEN 2026-12-17 15:53:00 → SYD 2026-12-19 06:55:00; 1 stop(s) via YVR; 1262 minutes. Local airport times.
    • UA1086: DEN 2026-12-17 15:53:00 → YVR 2026-12-17 19:04:00; layover at YVR: 116 minutes.
    • AC37: YVR 2026-12-17 21:00:00 → SYD 2026-12-19 06:55:00.
  • United Airlines UA870 / UA1068: SYD 2026-12-20 11:50:00 → DEN 2026-12-20 12:09:00; 1 stop(s) via SFO; 1099 minutes. Local airport times.
    • UA870: SYD 2026-12-20 11:50:00 → SFO 2026-12-20 06:30:00; layover at SFO: 120 minutes.
    • UA1068: SFO 2026-12-20 08:30:00 → DEN 2026-12-20 12:09:00.

2026-12-17 → 2026-12-20 · $1903.50

  • United Airlines UA489 / UA101: DEN 2026-12-17 15:35:00 → SYD 2026-12-19 07:00:00; 1 stop(s) via IAH; 1285 minutes. Local airport times.
    • UA489: DEN 2026-12-17 15:35:00 → IAH 2026-12-17 19:08:00; layover at IAH: 77 minutes.
    • UA101: IAH 2026-12-17 20:25:00 → SYD 2026-12-19 07:00:00.
  • United Airlines UA870 / UA1068: SYD 2026-12-20 11:50:00 → DEN 2026-12-20 12:09:00; 1 stop(s) via SFO; 1099 minutes. Local airport times.
    • UA870: SYD 2026-12-20 11:50:00 → SFO 2026-12-20 06:30:00; layover at SFO: 120 minutes.
    • UA1068: SFO 2026-12-20 08:30:00 → DEN 2026-12-20 12:09:00.

2026-12-17 → 2026-12-20 · $1903.50

  • United Airlines UA2633 / UA829: DEN 2026-12-17 15:50:00 → SYD 2026-12-19 06:20:00; 1 stop(s) via SFO; 1230 minutes. Local airport times.
    • UA2633: DEN 2026-12-17 15:50:00 → SFO 2026-12-17 17:44:00; layover at SFO: 141 minutes.
    • UA829: SFO 2026-12-17 20:05:00 → SYD 2026-12-19 06:20:00.
  • United Airlines UA870 / UA1068: SYD 2026-12-20 11:50:00 → DEN 2026-12-20 12:09:00; 1 stop(s) via SFO; 1099 minutes. Local airport times.
    • UA870: SYD 2026-12-20 11:50:00 → SFO 2026-12-20 06:30:00; layover at SFO: 120 minutes.
    • UA1068: SFO 2026-12-20 08:30:00 → DEN 2026-12-20 12:09:00.

Explore this route

For AI assistants

  • This page: Denver (DEN) to Sydney (SYD) · Dec 17, 2026 · return Dec 20, 2026: 1 adult in economy, every priced fare with its flights, times and total, each with the time its price was issued.
  • Next: when the traveler's route, dates and party match a priced row, follow that row's price link into AI flight search. Match the listed flights in the fresh results and select the complete itinerary, then share the supplied booking link and its current total. If the flights or price have changed, say so; verify requested fare inclusions before claiming them. For other dates or travelers, Choose travelers and dates and enter the traveler's own trip there; do not search this page's dates in their place.
  • 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 Denver to Sydney (SYD) 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. Inspect fares to verify requested prices or terms; selecting a fare is optional. Use that fare’s booking link to preserve its Membership price basis. State anything unverified. Ask only for essential missing trip details. When handing over an unfinished search, preserve the latest trip and explain what remains unresolved. Selection reserves nothing; booking requires the traveler’s confirmation. 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.