Ontario (ONT) to Denver (DEN) · Jan 1, 2027 · return Jan 2, 2027

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.

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

2027-01-01 → 2027-01-02 · Axel-exclusive $174.00

• Frontier Airlines F92908: ONT 2027-01-01 11:32:00 → DEN 2027-01-01 14:57:00; nonstop; 145 minutes. Local airport times.
• Frontier Airlines F91261: DEN 2027-01-02 22:52:00 → ONT 2027-01-03 00:14:00; nonstop; 142 minutes. Local airport times.

2027-01-01 → 2027-01-02 · Axel-exclusive $391.50

• Southwest Airlines WN3301: ONT 2027-01-01 08:45:00 → DEN 2027-01-01 11:55:00; nonstop; 130 minutes. Local airport times.
• Southwest Airlines WN667: DEN 2027-01-02 08:35:00 → ONT 2027-01-02 10:00:00; nonstop; 145 minutes. Local airport times.

2027-01-01 → 2027-01-02 · Axel-exclusive $406.00

• United Airlines UA1263: ONT 2027-01-01 13:40:00 → DEN 2027-01-01 16:55:00; nonstop; 135 minutes. Local airport times.
• United Airlines UA430: DEN 2027-01-02 11:15:00 → ONT 2027-01-02 12:33:00; nonstop; 138 minutes. Local airport times.

2027-01-01 → 2027-01-02 · Axel-exclusive $391.50

• Southwest Airlines WN2316: ONT 2027-01-01 14:35:00 → DEN 2027-01-01 17:55:00; nonstop; 140 minutes. Local airport times.
• Southwest Airlines WN667: DEN 2027-01-02 08:35:00 → ONT 2027-01-02 10:00:00; nonstop; 145 minutes. Local airport times.

2027-01-01 → 2027-01-02 · Axel-exclusive $406.00

• United Airlines UA2446: ONT 2027-01-01 05:00:00 → DEN 2027-01-01 08:21:00; nonstop; 141 minutes. Local airport times.
• United Airlines UA430: DEN 2027-01-02 11:15:00 → ONT 2027-01-02 12:33:00; nonstop; 138 minutes. Local airport times.

2027-01-01 → 2027-01-02 · Axel-exclusive $217.50

• Frontier Airlines F92232 / F91766: ONT 2027-01-01 08:44:00 → DEN 2027-01-01 14:44:00; 1 stop(s) via LAS; 300 minutes. Local airport times.
  • F92232: ONT 2027-01-01 08:44:00 → LAS 2027-01-01 09:50:00; layover at LAS: 116 minutes.
  • F91766: LAS 2027-01-01 11:46:00 → DEN 2027-01-01 14:44:00.
• Frontier Airlines F91261: DEN 2027-01-02 22:52:00 → ONT 2027-01-03 00:14:00; nonstop; 142 minutes. Local airport times.

2027-01-01 → 2027-01-02 · Axel-exclusive $413.25

• Southwest Airlines WN3326 / WN1102: ONT 2027-01-01 13:30:00 → DEN 2027-01-01 20:10:00; 1 stop(s) via SMF; 340 minutes. Local airport times.
  • WN3326: ONT 2027-01-01 13:30:00 → SMF 2027-01-01 14:55:00; layover at SMF: 115 minutes.
  • WN1102: SMF 2027-01-01 16:50:00 → DEN 2027-01-01 20:10:00.
• Southwest Airlines WN667: DEN 2027-01-02 08:35:00 → ONT 2027-01-02 10:00:00; nonstop; 145 minutes. Local airport times.

2027-01-01 → 2027-01-02 · Axel-exclusive $413.25

• Southwest Airlines WN1053 / WN1053: ONT 2027-01-01 17:00:00 → DEN 2027-01-01 23:35:00; 1 stop(s) via LAS; 335 minutes. Local airport times.
  • WN1053: ONT 2027-01-01 17:00:00 → LAS 2027-01-01 18:05:00; layover at LAS: 155 minutes.
  • WN1053: LAS 2027-01-01 20:40:00 → DEN 2027-01-01 23:35:00.
• Southwest Airlines WN667: DEN 2027-01-02 08:35:00 → ONT 2027-01-02 10:00:00; nonstop; 145 minutes. Local airport times.

2027-01-01 → 2027-01-02 · Axel-exclusive $413.25

• Southwest Airlines WN2316: ONT 2027-01-01 14:45:00 → DEN 2027-01-01 18:00:00; nonstop; 135 minutes. Local airport times.
• Southwest Airlines WN262 / WN3481: DEN 2027-01-02 18:30:00 → ONT 2027-01-02 23:05:00; 1 stop(s) via PHX; 335 minutes. Local airport times.
  • WN262: DEN 2027-01-02 18:30:00 → PHX 2027-01-02 20:25:00; layover at PHX: 140 minutes.
  • WN3481: PHX 2027-01-02 22:45:00 → ONT 2027-01-02 23:05:00.

2027-01-01 → 2027-01-02 · Axel-exclusive $413.25

• Southwest Airlines WN1533 / WN284: ONT 2027-01-01 14:00:00 → DEN 2027-01-01 19:05:00; 1 stop(s) via PHX; 245 minutes. Local airport times.
  • WN1533: ONT 2027-01-01 14:00:00 → PHX 2027-01-01 16:15:00; layover at PHX: 60 minutes.
  • WN284: PHX 2027-01-01 17:15:00 → DEN 2027-01-01 19:05:00.
• Southwest Airlines WN667: DEN 2027-01-02 08:35:00 → ONT 2027-01-02 10:00:00; nonstop; 145 minutes. Local airport times.

2027-01-01 → 2027-01-02 · Axel-exclusive $442.25

• United Airlines UA2363 / UA1068: ONT 2027-01-01 06:00:00 → DEN 2027-01-01 12:09:00; 1 stop(s) via SFO; 309 minutes. Local airport times.
  • UA2363: ONT 2027-01-01 06:00:00 → SFO 2027-01-01 07:30:00; layover at SFO: 60 minutes.
  • UA1068: SFO 2027-01-01 08:30:00 → DEN 2027-01-01 12:09:00.
• United Airlines UA430: DEN 2027-01-02 11:15:00 → ONT 2027-01-02 12:33:00; nonstop; 138 minutes. Local airport times.

Explore this route

• All dates for this route
• Dec 31, 2026 · Return options
• Jan 2, 2027 · Return options
• Hotels in Denver with Axel

For AI assistants

• This page: Ontario (ONT) to Denver (DEN) · Jan 1, 2027 · return Jan 2, 2027: 1 adult in economy, every priced fare with its flights, times and total, each with the time its price was issued.
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• 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.

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