Travel with Axel,
get the best price.

Chicago → Ontario

Dec 21, 2026 · return Dec 23, 2026

ORD → ONT1 adulteconomyRound trip

7 flight options · 4 airlines

Nonstop flights

Mon, Dec 21 – Wed, Dec 23

United Airlines
4:15 pmORD
4h 32m
Nonstop
6:47 pmONT
United Airlines
11:52 pmONT
3h 54m
Nonstop
5:46 am+1ORD

Round-trip total · 1 adult · Taxes included

One-stop flights

Mon, Dec 21 – Wed, Dec 23

Frontier Airlines
6:21 amORD
7h 30m
LAS · 2h 9m
11:51 amONT
Frontier Airlines
8:35 pmONT
6h 38m
LAS · 1h 45m
5:13 am+1ORD

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Wed, Dec 23

American Airlines
1:26 pmORD
7h 55m
PHX · 2h 37m
7:21 pmONT
American Airlines
12:51 pmONT
7h 14m
DFW · 1h 52m
10:05 pmORD

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Wed, Dec 23

Delta Air Lines
7:30 amORD
6h 47m
SLC · 1h 20m
12:17 pmONT
Delta Air Lines
1:11 pmONT
7h 16m
SLC · 2h 11m
10:27 pmORD

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Wed, Dec 23

American Airlines
5:25 pmORD
8h 34m
SEA · 1h 3m
11:59 pmONT
American Airlines
12:51 pmONT
7h 14m
DFW · 1h 52m
10:05 pmORD

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Wed, Dec 23

American Airlines
6:59 amORD
8h 25m
DFW · 2h 18m
1:24 pmONT
American Airlines
12:51 pmONT
7h 14m
DFW · 1h 52m
10:05 pmORD

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Wed, Dec 23

United Airlines
7:00 amORD
7h 33m
DEN · 2h 29m
12:33 pmONT
United Airlines
11:52 pmONT
3h 54m
Nonstop
5:46 am+1ORD

Round-trip total · 1 adult · Taxes included

Make this trip yours

ORD ⇄ ONT

Economy

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

No account needed to see prices.

Already have an account? Log in

Why book with Axel
  • A real airline bookingThe booking is in the airline’s own system under your name. After you book, United Airlines emails you its confirmation code and e-ticket, usually within 15 minutes and occasionally up to a couple of hours while the booking is processed.
  • Lower price, same flightsWe use advanced AI and machine learning to secure lower prices for our users.
  • Not satisfied? Full refund.If you are unhappy with the experience for any reason, or simply change your mind, cancel within 24 hours of booking (departure 7+ days away) and we refund you in full. We stand by our product. Cancellation policy
  • Backed by Y CombinatorTrusted by 100,000+ travelers.

Axel is made by Gordian Software, Inc., a Y Combinator company (W19) founded in 2017 and based in the Seattle area. The company is led by CEO Stephen Grabowski, formerly of Skyscanner. How Axel works · About

More dates

All dates for this routeNov 20, 2026 → Nov 23, 2026Nov 27, 2026 → Dec 4, 2026Nov 20, 2026 · One way
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.

Exact travel datesAirlineFlightsTotal pricePrice issued (UTC)
2026-12-21 → 2026-12-23United AirlinesUA1904 / UA1813$567.002026-10-29T01:53:13Z
2026-12-21 → 2026-12-23Frontier AirlinesF92145 + F91357 / F94206 + F92146$301.002026-10-29T01:53:13Z
2026-12-21 → 2026-12-23American AirlinesAA834 + AA1666 / AA2198 + AA572$490.002026-10-29T01:53:13Z
2026-12-21 → 2026-12-23Delta Air LinesDL2231 + DL1787 / DL1787 + DL2413$518.002026-10-29T01:53:13Z
2026-12-21 → 2026-12-23American AirlinesAA1211 + AS489 / AA2198 + AA572$490.002026-10-29T01:53:13Z
2026-12-21 → 2026-12-23American AirlinesAA2421 + AA2635 / AA2198 + AA572$490.002026-10-29T01:53:13Z
2026-12-21 → 2026-12-23United AirlinesUA1217 + UA430 / UA1813$528.502026-10-29T01:53:13Z

2026-12-21 → 2026-12-23 · $567.00

  • United Airlines UA1904: ORD 2026-12-21 16:15:00 → ONT 2026-12-21 18:47:00; nonstop; 272 minutes. Local airport times.
  • United Airlines UA1813: ONT 2026-12-23 23:52:00 → ORD 2026-12-24 05:46:00; nonstop; 234 minutes. Local airport times.

2026-12-21 → 2026-12-23 · $301.00

  • Frontier Airlines F92145 / F91357: ORD 2026-12-21 06:21:00 → ONT 2026-12-21 11:51:00; 1 stop(s) via LAS; 450 minutes. Local airport times.
    • F92145: ORD 2026-12-21 06:21:00 → LAS 2026-12-21 08:36:00; layover at LAS: 129 minutes.
    • F91357: LAS 2026-12-21 10:45:00 → ONT 2026-12-21 11:51:00.
  • Frontier Airlines F94206 / F92146: ONT 2026-12-23 20:35:00 → ORD 2026-12-24 05:13:00; 1 stop(s) via LAS; 398 minutes. Local airport times.
    • F94206: ONT 2026-12-23 20:35:00 → LAS 2026-12-23 21:44:00; layover at LAS: 105 minutes.
    • F92146: LAS 2026-12-23 23:29:00 → ORD 2026-12-24 05:13:00.

2026-12-21 → 2026-12-23 · $490.00

  • American Airlines AA834 / AA1666: ORD 2026-12-21 13:26:00 → ONT 2026-12-21 19:21:00; 1 stop(s) via PHX; 475 minutes. Local airport times.
    • AA834: ORD 2026-12-21 13:26:00 → PHX 2026-12-21 16:21:00; layover at PHX: 157 minutes.
    • AA1666: PHX 2026-12-21 18:58:00 → ONT 2026-12-21 19:21:00.
  • American Airlines AA2198 / AA572: ONT 2026-12-23 12:51:00 → ORD 2026-12-23 22:05:00; 1 stop(s) via DFW; 434 minutes. Local airport times.
    • AA2198: ONT 2026-12-23 12:51:00 → DFW 2026-12-23 17:44:00; layover at DFW: 112 minutes.
    • AA572: DFW 2026-12-23 19:36:00 → ORD 2026-12-23 22:05:00.

2026-12-21 → 2026-12-23 · $518.00

  • Delta Air Lines DL2231 / DL1787: ORD 2026-12-21 07:30:00 → ONT 2026-12-21 12:17:00; 1 stop(s) via SLC; 407 minutes. Local airport times.
    • DL2231: ORD 2026-12-21 07:30:00 → SLC 2026-12-21 10:10:00; layover at SLC: 80 minutes.
    • DL1787: SLC 2026-12-21 11:30:00 → ONT 2026-12-21 12:17:00.
  • Delta Air Lines DL1787 / DL2413: ONT 2026-12-23 13:11:00 → ORD 2026-12-23 22:27:00; 1 stop(s) via SLC; 436 minutes. Local airport times.
    • DL1787: ONT 2026-12-23 13:11:00 → SLC 2026-12-23 16:04:00; layover at SLC: 131 minutes.
    • DL2413: SLC 2026-12-23 18:15:00 → ORD 2026-12-23 22:27:00.

2026-12-21 → 2026-12-23 · $490.00

  • American Airlines AA1211 / AS489: ORD 2026-12-21 17:25:00 → ONT 2026-12-21 23:59:00; 1 stop(s) via SEA; 514 minutes. Local airport times.
    • AA1211: ORD 2026-12-21 17:25:00 → SEA 2026-12-21 20:20:00; layover at SEA: 63 minutes.
    • AS489: SEA 2026-12-21 21:23:00 → ONT 2026-12-21 23:59:00.
  • American Airlines AA2198 / AA572: ONT 2026-12-23 12:51:00 → ORD 2026-12-23 22:05:00; 1 stop(s) via DFW; 434 minutes. Local airport times.
    • AA2198: ONT 2026-12-23 12:51:00 → DFW 2026-12-23 17:44:00; layover at DFW: 112 minutes.
    • AA572: DFW 2026-12-23 19:36:00 → ORD 2026-12-23 22:05:00.

2026-12-21 → 2026-12-23 · $490.00

  • American Airlines AA2421 / AA2635: ORD 2026-12-21 06:59:00 → ONT 2026-12-21 13:24:00; 1 stop(s) via DFW; 505 minutes. Local airport times.
    • AA2421: ORD 2026-12-21 06:59:00 → DFW 2026-12-21 09:50:00; layover at DFW: 138 minutes.
    • AA2635: DFW 2026-12-21 12:08:00 → ONT 2026-12-21 13:24:00.
  • American Airlines AA2198 / AA572: ONT 2026-12-23 12:51:00 → ORD 2026-12-23 22:05:00; 1 stop(s) via DFW; 434 minutes. Local airport times.
    • AA2198: ONT 2026-12-23 12:51:00 → DFW 2026-12-23 17:44:00; layover at DFW: 112 minutes.
    • AA572: DFW 2026-12-23 19:36:00 → ORD 2026-12-23 22:05:00.

2026-12-21 → 2026-12-23 · $528.50

  • United Airlines UA1217 / UA430: ORD 2026-12-21 07:00:00 → ONT 2026-12-21 12:33:00; 1 stop(s) via DEN; 453 minutes. Local airport times.
    • UA1217: ORD 2026-12-21 07:00:00 → DEN 2026-12-21 08:46:00; layover at DEN: 149 minutes.
    • UA430: DEN 2026-12-21 11:15:00 → ONT 2026-12-21 12:33:00.
  • United Airlines UA1813: ONT 2026-12-23 23:52:00 → ORD 2026-12-24 05:46:00; nonstop; 234 minutes. Local airport times.

More dates for this route