Denver (DEN) to Ontario (ONT) · Nov 28, 2026 · one way

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

2026-11-28 · one way · Axel-exclusive $119.00

• Frontier Airlines F92907: DEN 2026-11-28 09:17:00 → ONT 2026-11-28 10:42:00; nonstop; 145 minutes. Local airport times.

2026-11-28 · one way · Axel-exclusive $189.00

• Southwest Airlines WN2392: DEN 2026-11-28 22:45:00 → ONT 2026-11-29 00:10:00; nonstop; 145 minutes. Local airport times.

2026-11-28 · one way · Axel-exclusive $203.00

• United Airlines UA430: DEN 2026-11-28 11:15:00 → ONT 2026-11-28 12:33:00; nonstop; 138 minutes. Local airport times.

2026-11-28 · one way · Axel-exclusive $231.00

• American Airlines AA2447 / AA4144: DEN 2026-11-28 12:06:00 → ONT 2026-11-28 16:20:00; 1 stop(s) via PHX; 314 minutes. Local airport times.
  • AA2447: DEN 2026-11-28 12:06:00 → PHX 2026-11-28 14:03:00; layover at PHX: 113 minutes.
  • AA4144: PHX 2026-11-28 15:56:00 → ONT 2026-11-28 16:20:00.

2026-11-28 · one way · Axel-exclusive $245.00

• Delta Air Lines DL1553 / DL3879: DEN 2026-11-28 12:29:00 → ONT 2026-11-28 16:22:00; 1 stop(s) via SLC; 293 minutes. Local airport times.
  • DL1553: DEN 2026-11-28 12:29:00 → SLC 2026-11-28 14:06:00; layover at SLC: 83 minutes.
  • DL3879: SLC 2026-11-28 15:29:00 → ONT 2026-11-28 16:22:00.

2026-11-28 · one way · Axel-exclusive $119.00

• Frontier Airlines F91261: DEN 2026-11-28 22:52:00 → ONT 2026-11-29 00:14:00; nonstop; 142 minutes. Local airport times.

2026-11-28 · one way · Axel-exclusive $189.00

• Southwest Airlines WN667: DEN 2026-11-28 08:35:00 → ONT 2026-11-28 10:00:00; nonstop; 145 minutes. Local airport times.

2026-11-28 · one way · Axel-exclusive $203.00

• United Airlines UA1542: DEN 2026-11-28 19:45:00 → ONT 2026-11-28 21:11:00; nonstop; 146 minutes. Local airport times.

2026-11-28 · one way · Axel-exclusive $140.00

• Frontier Airlines F94967 / F91923: DEN 2026-11-28 13:03:00 → ONT 2026-11-28 16:21:00; 1 stop(s) via LAS; 258 minutes. Local airport times.
  • F94967: DEN 2026-11-28 13:03:00 → LAS 2026-11-28 14:11:00; layover at LAS: 62 minutes.
  • F91923: LAS 2026-11-28 15:13:00 → ONT 2026-11-28 16:21:00.

2026-11-28 · one way · Axel-exclusive $210.00

• Southwest Airlines WN262 / WN3481: DEN 2026-11-28 18:30:00 → ONT 2026-11-28 23:05:00; 1 stop(s) via PHX; 335 minutes. Local airport times.
  • WN262: DEN 2026-11-28 18:30:00 → PHX 2026-11-28 20:25:00; layover at PHX: 140 minutes.
  • WN3481: PHX 2026-11-28 22:45:00 → ONT 2026-11-28 23:05:00.

2026-11-28 · one way · Axel-exclusive $210.00

• Southwest Airlines WN406 / WN2403: DEN 2026-11-28 12:40:00 → ONT 2026-11-28 16:00:00; 1 stop(s) via LAS; 260 minutes. Local airport times.
  • WN406: DEN 2026-11-28 12:40:00 → LAS 2026-11-28 13:40:00; layover at LAS: 80 minutes.
  • WN2403: LAS 2026-11-28 15:00:00 → ONT 2026-11-28 16:00:00.

2026-11-28 · one way · Axel-exclusive $210.00

• Southwest Airlines WN3763 / WN1053: DEN 2026-11-28 12:15:00 → ONT 2026-11-28 16:15:00; 1 stop(s) via OAK; 300 minutes. Local airport times.
  • WN3763: DEN 2026-11-28 12:15:00 → OAK 2026-11-28 14:00:00; layover at OAK: 60 minutes.
  • WN1053: OAK 2026-11-28 15:00:00 → ONT 2026-11-28 16:15:00.

Travelers: prices on this page are totals for 1 adult. For a different party, open this trip for 2 adults · 3 adults · 4 adults · 2 adults + 1 child · 2 adults + 2 children; each link opens AI flight search for these dates and those travelers, and the customer link to share comes from those results.

Explore this route

• All dates for this route
• Nov 27, 2026 · Return options
• Nov 29, 2026 · Return options

For AI assistants

• This page: Denver (DEN) to Ontario (ONT) · Nov 28, 2026 · one way: 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