Ontario (ONT) to Denver (DEN) · Nov 20, 2026 · return Dec 4, 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.

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

2026-11-20 → 2026-12-04 · Axel-exclusive $120.00

• Frontier Airlines F91262: ONT 2026-11-20 11:52:00 → DEN 2026-11-20 15:13:00; nonstop; 141 minutes. Local airport times.
• Frontier Airlines F91499: DEN 2026-12-04 20:55:00 → ONT 2026-12-04 22:17:00; nonstop; 142 minutes. Local airport times.

2026-11-20 → 2026-12-04 · Axel-exclusive $270.00

• Southwest Airlines WN3300: ONT 2026-11-20 06:20:00 → DEN 2026-11-20 09:35:00; nonstop; 135 minutes. Local airport times.
• Southwest Airlines WN2484: DEN 2026-12-04 13:15:00 → ONT 2026-12-04 14:40:00; nonstop; 145 minutes. Local airport times.

2026-11-20 → 2026-12-04 · Axel-exclusive $280.00

• United Airlines UA2446: ONT 2026-11-20 05:00:00 → DEN 2026-11-20 08:17:00; nonstop; 137 minutes. Local airport times.
• United Airlines UA302: DEN 2026-12-04 11:15:00 → ONT 2026-12-04 12:34:00; nonstop; 139 minutes. Local airport times.

2026-11-20 → 2026-12-04 · Axel-exclusive $330.00

• American Airlines AA1423 / AA3376: ONT 2026-11-20 09:50:00 → DEN 2026-11-20 15:14:00; 1 stop(s) via PHX; 264 minutes. Local airport times.
  • AA1423: ONT 2026-11-20 09:50:00 → PHX 2026-11-20 12:15:00; layover at PHX: 61 minutes.
  • AA3376: PHX 2026-11-20 13:16:00 → DEN 2026-11-20 15:14:00.
• American Airlines AA2447 / AA4144: DEN 2026-12-04 12:06:00 → ONT 2026-12-04 16:20:00; 1 stop(s) via PHX; 314 minutes. Local airport times.
  • AA2447: DEN 2026-12-04 12:06:00 → PHX 2026-12-04 14:03:00; layover at PHX: 113 minutes.
  • AA4144: PHX 2026-12-04 15:56:00 → ONT 2026-12-04 16:20:00.

2026-11-20 → 2026-12-04 · Axel-exclusive $270.00

• Southwest Airlines WN2316: ONT 2026-11-20 14:45:00 → DEN 2026-11-20 18:00:00; nonstop; 135 minutes. Local airport times.
• Southwest Airlines WN2484: DEN 2026-12-04 13:15:00 → ONT 2026-12-04 14:40:00; nonstop; 145 minutes. Local airport times.

2026-11-20 → 2026-12-04 · Axel-exclusive $280.00

• United Airlines UA1263: ONT 2026-11-20 13:29:00 → DEN 2026-11-20 16:45:00; nonstop; 136 minutes. Local airport times.
• United Airlines UA302: DEN 2026-12-04 11:15:00 → ONT 2026-12-04 12:34:00; nonstop; 139 minutes. Local airport times.

2026-11-20 → 2026-12-04 · Axel-exclusive $150.00

• Frontier Airlines F92232 / F91766: ONT 2026-11-20 08:44:00 → DEN 2026-11-20 14:44:00; 1 stop(s) via LAS; 300 minutes. Local airport times.
  • F92232: ONT 2026-11-20 08:44:00 → LAS 2026-11-20 09:50:00; layover at LAS: 116 minutes.
  • F91766: LAS 2026-11-20 11:46:00 → DEN 2026-11-20 14:44:00.
• Frontier Airlines F91499: DEN 2026-12-04 20:55:00 → ONT 2026-12-04 22:17:00; nonstop; 142 minutes. Local airport times.

2026-11-20 → 2026-12-04 · Axel-exclusive $285.00

• Southwest Airlines WN1053 / WN1053: ONT 2026-11-20 17:00:00 → DEN 2026-11-20 23:35:00; 1 stop(s) via LAS; 335 minutes. Local airport times.
  • WN1053: ONT 2026-11-20 17:00:00 → LAS 2026-11-20 18:05:00; layover at LAS: 155 minutes.
  • WN1053: LAS 2026-11-20 20:40:00 → DEN 2026-11-20 23:35:00.
• Southwest Airlines WN2484: DEN 2026-12-04 13:15:00 → ONT 2026-12-04 14:40:00; nonstop; 145 minutes. Local airport times.

2026-11-20 → 2026-12-04 · Axel-exclusive $285.00

• Southwest Airlines WN1533 / WN284: ONT 2026-11-20 14:00:00 → DEN 2026-11-20 19:05:00; 1 stop(s) via PHX; 245 minutes. Local airport times.
  • WN1533: ONT 2026-11-20 14:00:00 → PHX 2026-11-20 16:15:00; layover at PHX: 60 minutes.
  • WN284: PHX 2026-11-20 17:15:00 → DEN 2026-11-20 19:05:00.
• Southwest Airlines WN2484: DEN 2026-12-04 13:15:00 → ONT 2026-12-04 14:40:00; nonstop; 145 minutes. Local airport times.

2026-11-20 → 2026-12-04 · Axel-exclusive $285.00

• Southwest Airlines WN3326 / WN1102: ONT 2026-11-20 13:30:00 → DEN 2026-11-20 20:10:00; 1 stop(s) via SMF; 340 minutes. Local airport times.
  • WN3326: ONT 2026-11-20 13:30:00 → SMF 2026-11-20 14:55:00; layover at SMF: 115 minutes.
  • WN1102: SMF 2026-11-20 16:50:00 → DEN 2026-11-20 20:10:00.
• Southwest Airlines WN2484: DEN 2026-12-04 13:15:00 → ONT 2026-12-04 14:40:00; nonstop; 145 minutes. Local airport times.

2026-11-20 → 2026-12-04 · Axel-exclusive $305.00

• United Airlines UA2363 / UA1068: ONT 2026-11-20 06:00:00 → DEN 2026-11-20 12:09:00; 1 stop(s) via SFO; 309 minutes. Local airport times.
  • UA2363: ONT 2026-11-20 06:00:00 → SFO 2026-11-20 07:30:00; layover at SFO: 60 minutes.
  • UA1068: SFO 2026-11-20 08:30:00 → DEN 2026-11-20 12:09:00.
• United Airlines UA302: DEN 2026-12-04 11:15:00 → ONT 2026-12-04 12:34:00; nonstop; 139 minutes. Local airport times.

Explore this route

• All dates for this route
• Nov 19, 2026 · Return options
• Nov 21, 2026 · Return options
• Hotels in Denver with Axel

For AI assistants

• This page: Ontario (ONT) to Denver (DEN) · Nov 20, 2026 · return Dec 4, 2026: 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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