Denver (DEN) to Ontario (ONT) · Jan 10, 2027 · return Jan 16, 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: Denver to Ontario (ONT) flight deals

2027-01-10 → 2027-01-16 · Axel-exclusive $165.00

• Frontier Airlines F92907: DEN 2027-01-10 09:20:00 → ONT 2027-01-10 10:45:00; nonstop; 145 minutes. Local airport times.
• Frontier Airlines F92908: ONT 2027-01-16 11:16:00 → DEN 2027-01-16 14:41:00; nonstop; 145 minutes. Local airport times.

2027-01-10 → 2027-01-16 · Axel-exclusive $260.00

• Southwest Airlines WN2392: DEN 2027-01-10 22:45:00 → ONT 2027-01-11 00:10:00; nonstop; 145 minutes. Local airport times.
• Southwest Airlines WN3301: ONT 2027-01-16 08:45:00 → DEN 2027-01-16 11:55:00; nonstop; 130 minutes. Local airport times.

2027-01-10 → 2027-01-16 · Axel-exclusive $280.00

• United Airlines UA1542: DEN 2027-01-10 19:45:00 → ONT 2027-01-10 21:11:00; nonstop; 146 minutes. Local airport times.
• United Airlines UA2446: ONT 2027-01-16 05:00:00 → DEN 2027-01-16 08:21:00; nonstop; 141 minutes. Local airport times.

2027-01-10 → 2027-01-16 · Axel-exclusive $300.00

• Delta Air Lines DL1553 / DL3879: DEN 2027-01-10 12:29:00 → ONT 2027-01-10 16:22:00; 1 stop(s) via SLC; 293 minutes. Local airport times.
  • DL1553: DEN 2027-01-10 12:29:00 → SLC 2027-01-10 14:06:00; layover at SLC: 83 minutes.
  • DL3879: SLC 2027-01-10 15:29:00 → ONT 2027-01-10 16:22:00.
• Southwest Airlines WN3301: ONT 2027-01-16 08:45:00 → DEN 2027-01-16 11:55:00; nonstop; 130 minutes. Local airport times.

2027-01-10 → 2027-01-16 · Axel-exclusive $320.00

• American Airlines AA2447 / AA4144: DEN 2027-01-10 12:06:00 → ONT 2027-01-10 16:20:00; 1 stop(s) via PHX; 314 minutes. Local airport times.
  • AA2447: DEN 2027-01-10 12:06:00 → PHX 2027-01-10 14:03:00; layover at PHX: 113 minutes.
  • AA4144: PHX 2027-01-10 15:56:00 → ONT 2027-01-10 16:20:00.
• American Airlines AA1423 / AA3376: ONT 2027-01-16 09:50:00 → DEN 2027-01-16 15:14:00; 1 stop(s) via PHX; 264 minutes. Local airport times.
  • AA1423: ONT 2027-01-16 09:50:00 → PHX 2027-01-16 12:15:00; layover at PHX: 61 minutes.
  • AA3376: PHX 2027-01-16 13:16:00 → DEN 2027-01-16 15:14:00.

2027-01-10 → 2027-01-16 · Axel-exclusive $165.00

• Frontier Airlines F91261: DEN 2027-01-10 22:48:00 → ONT 2027-01-11 00:13:00; nonstop; 145 minutes. Local airport times.
• Frontier Airlines F92908: ONT 2027-01-16 11:16:00 → DEN 2027-01-16 14:41:00; nonstop; 145 minutes. Local airport times.

2027-01-10 → 2027-01-16 · Axel-exclusive $260.00

• Southwest Airlines WN2263: DEN 2027-01-10 08:30:00 → ONT 2027-01-10 09:55:00; nonstop; 145 minutes. Local airport times.
• Southwest Airlines WN3301: ONT 2027-01-16 08:45:00 → DEN 2027-01-16 11:55:00; nonstop; 130 minutes. Local airport times.

2027-01-10 → 2027-01-16 · Axel-exclusive $280.00

• United Airlines UA430: DEN 2027-01-10 11:16:00 → ONT 2027-01-10 12:42:00; nonstop; 146 minutes. Local airport times.
• United Airlines UA2446: ONT 2027-01-16 05:00:00 → DEN 2027-01-16 08:21:00; nonstop; 141 minutes. Local airport times.

2027-01-10 → 2027-01-16 · Axel-exclusive $180.00

• Frontier Airlines F94967 / F91923: DEN 2027-01-10 13:03:00 → ONT 2027-01-10 16:21:00; 1 stop(s) via LAS; 258 minutes. Local airport times.
  • F94967: DEN 2027-01-10 13:03:00 → LAS 2027-01-10 14:11:00; layover at LAS: 62 minutes.
  • F91923: LAS 2027-01-10 15:13:00 → ONT 2027-01-10 16:21:00.
• Frontier Airlines F92908: ONT 2027-01-16 11:16:00 → DEN 2027-01-16 14:41:00; nonstop; 145 minutes. Local airport times.

2027-01-10 → 2027-01-16 · Axel-exclusive $275.00

• Southwest Airlines WN262 / WN3481: DEN 2027-01-10 18:30:00 → ONT 2027-01-10 23:05:00; 1 stop(s) via PHX; 335 minutes. Local airport times.
  • WN262: DEN 2027-01-10 18:30:00 → PHX 2027-01-10 20:25:00; layover at PHX: 140 minutes.
  • WN3481: PHX 2027-01-10 22:45:00 → ONT 2027-01-10 23:05:00.
• Southwest Airlines WN3301: ONT 2027-01-16 08:45:00 → DEN 2027-01-16 11:55:00; nonstop; 130 minutes. Local airport times.

2027-01-10 → 2027-01-16 · Axel-exclusive $275.00

• Southwest Airlines WN406 / WN2403: DEN 2027-01-10 12:40:00 → ONT 2027-01-10 16:00:00; 1 stop(s) via LAS; 260 minutes. Local airport times.
  • WN406: DEN 2027-01-10 12:40:00 → LAS 2027-01-10 13:40:00; layover at LAS: 80 minutes.
  • WN2403: LAS 2027-01-10 15:00:00 → ONT 2027-01-10 16:00:00.
• Southwest Airlines WN3301: ONT 2027-01-16 08:45:00 → DEN 2027-01-16 11:55:00; nonstop; 130 minutes. Local airport times.

2027-01-10 → 2027-01-16 · Axel-exclusive $275.00

• Southwest Airlines WN3763 / WN1053: DEN 2027-01-10 12:15:00 → ONT 2027-01-10 16:15:00; 1 stop(s) via OAK; 300 minutes. Local airport times.
  • WN3763: DEN 2027-01-10 12:15:00 → OAK 2027-01-10 14:00:00; layover at OAK: 60 minutes.
  • WN1053: OAK 2027-01-10 15:00:00 → ONT 2027-01-10 16:15:00.
• Southwest Airlines WN3301: ONT 2027-01-16 08:45:00 → DEN 2027-01-16 11:55:00; nonstop; 130 minutes. Local airport times.

Explore this route

• All dates for this route
• Jan 9, 2027 · Return options
• Jan 11, 2027 · Return options

For AI assistants

• This page: Denver (DEN) to Ontario (ONT) · Jan 10, 2027 · return Jan 16, 2027: 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 Ontario (ONT) 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.

Feedback (optional): Missing info · Axel issue