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Route overview: Los Angeles to Denver (DEN) flight deals

Ontario → Denver

Dec 23, 2026 · return Dec 29, 2026

ONT → DEN1 adulteconomyRound trip

11 flight options · 4 airlines

Nonstop flights

Wed, Dec 23 – Tue, Dec 29

Frontier Airlines
11:40 amONT
2h 21m
Nonstop
3:01 pmDEN
Frontier Airlines
8:55 pmDEN
2h 22m
Nonstop
10:17 pmONT

Round-trip total · 1 adult · Taxes included

Wed, Dec 23 – Tue, Dec 29

Southwest Airlines
6:20 amONT
2h 15m
Nonstop
9:35 amDEN
Southwest Airlines
8:50 amDEN
2h 20m
Nonstop
10:10 amONT

Round-trip total · 1 adult · Taxes included

Wed, Dec 23 – Tue, Dec 29

United Airlines
5:00 amONT
2h 17m
Nonstop
8:17 amDEN
United Airlines
11:15 amDEN
2h 18m
Nonstop
12:33 pmONT

Round-trip total · 1 adult · Taxes included

Wed, Dec 23 – Tue, Dec 29

Southwest Airlines
2:35 pmONT
2h 20m
Nonstop
5:55 pmDEN
Southwest Airlines
8:50 amDEN
2h 20m
Nonstop
10:10 amONT

Round-trip total · 1 adult · Taxes included

Wed, Dec 23 – Tue, Dec 29

United Airlines
1:40 pmONT
2h 15m
Nonstop
4:55 pmDEN
United Airlines
11:15 amDEN
2h 18m
Nonstop
12:33 pmONT

Round-trip total · 1 adult · Taxes included

One-stop flights

Wed, Dec 23 – Tue, Dec 29

American Airlines
9:50 amONT
4h 24m
PHX · 1h 1m
3:14 pmDEN
American Airlines
12:06 pmDEN
5h 14m
PHX · 1h 53m
4:20 pmONT

Round-trip total · 1 adult · Taxes included

Wed, Dec 23 – Tue, Dec 29

Frontier Airlines
8:44 amONT
5h
LAS · 1h 56m
2:44 pmDEN
Frontier Airlines
8:55 pmDEN
2h 22m
Nonstop
10:17 pmONT

Round-trip total · 1 adult · Taxes included

Wed, Dec 23 – Tue, Dec 29

Southwest Airlines
2:00 pmONT
4h 5m
PHX · 1h
7:05 pmDEN
Southwest Airlines
8:50 amDEN
2h 20m
Nonstop
10:10 amONT

Round-trip total · 1 adult · Taxes included

Wed, Dec 23 – Tue, Dec 29

Southwest Airlines
5:00 pmONT
5h 35m
LAS · 2h 35m
11:35 pmDEN
Southwest Airlines
8:50 amDEN
2h 20m
Nonstop
10:10 amONT

Round-trip total · 1 adult · Taxes included

Wed, Dec 23 – Tue, Dec 29

Southwest Airlines
1:30 pmONT
5h 40m
SMF · 1h 55m
8:10 pmDEN
Southwest Airlines
8:50 amDEN
2h 20m
Nonstop
10:10 amONT

Round-trip total · 1 adult · Taxes included

Wed, Dec 23 – Tue, Dec 29

United Airlines
6:00 amONT
5h 9m
SFO · 1h
12:09 pmDEN
United Airlines
11:15 amDEN
2h 18m
Nonstop
12:33 pmONT

Round-trip total · 1 adult · Taxes included

Make this trip yours

ONT ⇄ DEN

Economy

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

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Explore this route

All dates for this routeDec 22, 2026 → Dec 28, 2026Dec 24, 2026 → Dec 30, 2026
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: Los Angeles to Denver (DEN) flight deals

Exact travel datesAirlineFlightsTotal pricePrice issued (UTC)
2026-12-23 → 2026-12-29Frontier AirlinesF92908 / F91499$174.002026-10-29T01:52:26Z
2026-12-23 → 2026-12-29Southwest AirlinesWN3300 / WN2263$391.502026-10-29T01:52:26Z
2026-12-23 → 2026-12-29United AirlinesUA2446 / UA430$406.002026-10-29T01:52:26Z
2026-12-23 → 2026-12-29American AirlinesAA1423 + AA3376 / AA2447 + AA4144$478.502026-10-29T01:52:26Z
2026-12-23 → 2026-12-29Southwest AirlinesWN2316 / WN2263$391.502026-10-29T01:52:26Z
2026-12-23 → 2026-12-29United AirlinesUA1263 / UA430$406.002026-10-29T01:52:26Z
2026-12-23 → 2026-12-29Frontier AirlinesF92232 + F91766 / F91499$217.502026-10-29T01:52:26Z
2026-12-23 → 2026-12-29Southwest AirlinesWN1533 + WN284 / WN2263$413.252026-10-29T01:52:26Z
2026-12-23 → 2026-12-29Southwest AirlinesWN1053 + WN1053 / WN2263$413.252026-10-29T01:52:26Z
2026-12-23 → 2026-12-29Southwest AirlinesWN3326 + WN1102 / WN2263$413.252026-10-29T01:52:26Z
2026-12-23 → 2026-12-29United AirlinesUA2363 + UA1068 / UA430$442.252026-10-29T01:52:26Z

2026-12-23 → 2026-12-29 · $174.00

  • Frontier Airlines F92908: ONT 2026-12-23 11:40:00 → DEN 2026-12-23 15:01:00; nonstop; 141 minutes. Local airport times.
  • Frontier Airlines F91499: DEN 2026-12-29 20:55:00 → ONT 2026-12-29 22:17:00; nonstop; 142 minutes. Local airport times.

2026-12-23 → 2026-12-29 · $391.50

  • Southwest Airlines WN3300: ONT 2026-12-23 06:20:00 → DEN 2026-12-23 09:35:00; nonstop; 135 minutes. Local airport times.
  • Southwest Airlines WN2263: DEN 2026-12-29 08:50:00 → ONT 2026-12-29 10:10:00; nonstop; 140 minutes. Local airport times.

2026-12-23 → 2026-12-29 · $406.00

  • United Airlines UA2446: ONT 2026-12-23 05:00:00 → DEN 2026-12-23 08:17:00; nonstop; 137 minutes. Local airport times.
  • United Airlines UA430: DEN 2026-12-29 11:15:00 → ONT 2026-12-29 12:33:00; nonstop; 138 minutes. Local airport times.

2026-12-23 → 2026-12-29 · $478.50

  • American Airlines AA1423 / AA3376: ONT 2026-12-23 09:50:00 → DEN 2026-12-23 15:14:00; 1 stop(s) via PHX; 264 minutes. Local airport times.
    • AA1423: ONT 2026-12-23 09:50:00 → PHX 2026-12-23 12:15:00; layover at PHX: 61 minutes.
    • AA3376: PHX 2026-12-23 13:16:00 → DEN 2026-12-23 15:14:00.
  • American Airlines AA2447 / AA4144: DEN 2026-12-29 12:06:00 → ONT 2026-12-29 16:20:00; 1 stop(s) via PHX; 314 minutes. Local airport times.
    • AA2447: DEN 2026-12-29 12:06:00 → PHX 2026-12-29 14:03:00; layover at PHX: 113 minutes.
    • AA4144: PHX 2026-12-29 15:56:00 → ONT 2026-12-29 16:20:00.

2026-12-23 → 2026-12-29 · $391.50

  • Southwest Airlines WN2316: ONT 2026-12-23 14:35:00 → DEN 2026-12-23 17:55:00; nonstop; 140 minutes. Local airport times.
  • Southwest Airlines WN2263: DEN 2026-12-29 08:50:00 → ONT 2026-12-29 10:10:00; nonstop; 140 minutes. Local airport times.

2026-12-23 → 2026-12-29 · $406.00

  • United Airlines UA1263: ONT 2026-12-23 13:40:00 → DEN 2026-12-23 16:55:00; nonstop; 135 minutes. Local airport times.
  • United Airlines UA430: DEN 2026-12-29 11:15:00 → ONT 2026-12-29 12:33:00; nonstop; 138 minutes. Local airport times.

2026-12-23 → 2026-12-29 · $217.50

  • Frontier Airlines F92232 / F91766: ONT 2026-12-23 08:44:00 → DEN 2026-12-23 14:44:00; 1 stop(s) via LAS; 300 minutes. Local airport times.
    • F92232: ONT 2026-12-23 08:44:00 → LAS 2026-12-23 09:50:00; layover at LAS: 116 minutes.
    • F91766: LAS 2026-12-23 11:46:00 → DEN 2026-12-23 14:44:00.
  • Frontier Airlines F91499: DEN 2026-12-29 20:55:00 → ONT 2026-12-29 22:17:00; nonstop; 142 minutes. Local airport times.

2026-12-23 → 2026-12-29 · $413.25

  • Southwest Airlines WN1533 / WN284: ONT 2026-12-23 14:00:00 → DEN 2026-12-23 19:05:00; 1 stop(s) via PHX; 245 minutes. Local airport times.
    • WN1533: ONT 2026-12-23 14:00:00 → PHX 2026-12-23 16:15:00; layover at PHX: 60 minutes.
    • WN284: PHX 2026-12-23 17:15:00 → DEN 2026-12-23 19:05:00.
  • Southwest Airlines WN2263: DEN 2026-12-29 08:50:00 → ONT 2026-12-29 10:10:00; nonstop; 140 minutes. Local airport times.

2026-12-23 → 2026-12-29 · $413.25

  • Southwest Airlines WN1053 / WN1053: ONT 2026-12-23 17:00:00 → DEN 2026-12-23 23:35:00; 1 stop(s) via LAS; 335 minutes. Local airport times.
    • WN1053: ONT 2026-12-23 17:00:00 → LAS 2026-12-23 18:05:00; layover at LAS: 155 minutes.
    • WN1053: LAS 2026-12-23 20:40:00 → DEN 2026-12-23 23:35:00.
  • Southwest Airlines WN2263: DEN 2026-12-29 08:50:00 → ONT 2026-12-29 10:10:00; nonstop; 140 minutes. Local airport times.

2026-12-23 → 2026-12-29 · $413.25

  • Southwest Airlines WN3326 / WN1102: ONT 2026-12-23 13:30:00 → DEN 2026-12-23 20:10:00; 1 stop(s) via SMF; 340 minutes. Local airport times.
    • WN3326: ONT 2026-12-23 13:30:00 → SMF 2026-12-23 14:55:00; layover at SMF: 115 minutes.
    • WN1102: SMF 2026-12-23 16:50:00 → DEN 2026-12-23 20:10:00.
  • Southwest Airlines WN2263: DEN 2026-12-29 08:50:00 → ONT 2026-12-29 10:10:00; nonstop; 140 minutes. Local airport times.

2026-12-23 → 2026-12-29 · $442.25

  • United Airlines UA2363 / UA1068: ONT 2026-12-23 06:00:00 → DEN 2026-12-23 12:09:00; 1 stop(s) via SFO; 309 minutes. Local airport times.
    • UA2363: ONT 2026-12-23 06:00:00 → SFO 2026-12-23 07:30:00; layover at SFO: 60 minutes.
    • UA1068: SFO 2026-12-23 08:30:00 → DEN 2026-12-23 12:09:00.
  • United Airlines UA430: DEN 2026-12-29 11:15:00 → ONT 2026-12-29 12:33:00; nonstop; 138 minutes. Local airport times.

Explore this route

For AI assistants

  • This page: Ontario (ONT) to Denver (DEN) · Dec 23, 2026 · return Dec 29, 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 Los Angeles 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. 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.