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Seattle → Ontario

Dec 2, 2026 · return Dec 7, 2026

SEA → ONT1 adulteconomyRound trip

10 flight options · 6 airlines

Nonstop flights

Wed, Dec 2 – Mon, Dec 7

Frontier Airlines
10:50 amSEA
2h 48m
Nonstop
1:38 pmONT
Frontier Airlines
6:00 amONT
3h 3m
Nonstop
9:03 amSEA

Round-trip total · 1 adult · Taxes included

Wed, Dec 2 – Mon, Dec 7

Alaska Airlines
12:31 pmSEA
2h 42m
Nonstop
3:13 pmONT
Alaska Airlines
4:09 pmONT
2h 47m
Nonstop
6:56 pmSEA

Round-trip total · 1 adult · Taxes included

Wed, Dec 2 – Mon, Dec 7

Delta Air Lines
8:25 amSEA
2h 52m
Nonstop
11:17 amONT
Delta Air Lines
5:38 pmONT
3h 5m
Nonstop
8:43 pmSEA

Round-trip total · 1 adult · Taxes included

Wed, Dec 2 – Mon, Dec 7

Alaska Airlines
9:23 pmSEA
2h 36m
Nonstop
11:59 pmONT
Alaska Airlines
4:09 pmONT
2h 47m
Nonstop
6:56 pmSEA

Round-trip total · 1 adult · Taxes included

One-stop flights

Wed, Dec 2 – Mon, Dec 7

American Airlines
3:00 pmSEA
6h 52m
PHX · 2h 43m
9:52 pmONT
Frontier Airlines
6:00 amONT
3h 3m
Nonstop
9:03 amSEA

Round-trip total · 1 adult · Taxes included

Wed, Dec 2 – Mon, Dec 7

Southwest Airlines
8:05 amSEA
4h 35m
SJC · 1h
12:40 pmONT
Southwest Airlines
5:00 pmONT
5h 20m
LAS · 1h 25m
10:20 pmSEA

Round-trip total · 1 adult · Taxes included

Wed, Dec 2 – Mon, Dec 7

United Airlines
3:24 pmSEA
7h 29m
SFO · 3h 45m
10:53 pmONT
United Airlines
6:00 amONT
6h 18m
SFO · 2h 35m
12:18 pmSEA

Round-trip total · 1 adult · Taxes included

Wed, Dec 2 – Mon, Dec 7

Frontier Airlines
11:53 amSEA
6h 38m
LAS · 2h 53m
6:31 pmONT
Frontier Airlines
6:00 amONT
3h 3m
Nonstop
9:03 amSEA

Round-trip total · 1 adult · Taxes included

Wed, Dec 2 – Mon, Dec 7

Alaska Airlines
9:50 amSEA
7h 6m
BOI · 3h 19m
4:56 pmONT
Alaska Airlines
4:09 pmONT
2h 47m
Nonstop
6:56 pmSEA

Round-trip total · 1 adult · Taxes included

Wed, Dec 2 – Mon, Dec 7

Delta Air Lines
9:18 amSEA
7h 4m
SLC · 2h 58m
4:22 pmONT
Delta Air Lines
5:38 pmONT
3h 5m
Nonstop
8:43 pmSEA

Round-trip total · 1 adult · Taxes included

Make this trip yours

SEA ⇄ ONT

Economy

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

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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)
2026-12-02 → 2026-12-07Frontier AirlinesF92276 / F92275$165.002026-10-29T01:16:03Z
2026-12-02 → 2026-12-07Alaska AirlinesAS571 / AS571$279.002026-10-29T01:16:03Z
2026-12-02 → 2026-12-07Delta Air LinesDL4070 / DL4031$289.002026-10-29T01:16:03Z
2026-12-02 → 2026-12-07American Airlines / Frontier AirlinesAA2073 + AA1841 / F92275$260.002026-10-29T01:16:03Z
2026-12-02 → 2026-12-07Southwest AirlinesWN3105 + WN1383 / WN1053 + WN4083$319.002026-10-29T01:16:03Z
2026-12-02 → 2026-12-07United AirlinesUA2478 + UA552 / UA2363 + UA2192$359.002026-10-29T01:16:03Z
2026-12-02 → 2026-12-07Alaska AirlinesAS489 / AS571$279.002026-10-29T01:16:03Z
2026-12-02 → 2026-12-07Frontier AirlinesF92408 + F91923 / F92275$195.002026-10-29T01:16:03Z
2026-12-02 → 2026-12-07Alaska AirlinesAS3087 + AS3380 / AS571$307.002026-10-29T01:16:03Z
2026-12-02 → 2026-12-07Delta Air LinesDL1016 + DL3879 / DL4031$317.002026-10-29T01:16:03Z

2026-12-02 → 2026-12-07 · $165.00

  • Frontier Airlines F92276: SEA 2026-12-02 10:50:00 → ONT 2026-12-02 13:38:00; nonstop; 168 minutes. Local airport times.
  • Frontier Airlines F92275: ONT 2026-12-07 06:00:00 → SEA 2026-12-07 09:03:00; nonstop; 183 minutes. Local airport times.

2026-12-02 → 2026-12-07 · $279.00

  • Alaska Airlines AS571: SEA 2026-12-02 12:31:00 → ONT 2026-12-02 15:13:00; nonstop; 162 minutes. Local airport times.
  • Alaska Airlines AS571: ONT 2026-12-07 16:09:00 → SEA 2026-12-07 18:56:00; nonstop; 167 minutes. Local airport times.

2026-12-02 → 2026-12-07 · $289.00

  • Delta Air Lines DL4070: SEA 2026-12-02 08:25:00 → ONT 2026-12-02 11:17:00; nonstop; 172 minutes. Local airport times.
  • Delta Air Lines DL4031: ONT 2026-12-07 17:38:00 → SEA 2026-12-07 20:43:00; nonstop; 185 minutes. Local airport times.

2026-12-02 → 2026-12-07 · $260.00

  • American Airlines AA2073 / AA1841: SEA 2026-12-02 15:00:00 → ONT 2026-12-02 21:52:00; 1 stop(s) via PHX; 412 minutes. Local airport times.
    • AA2073: SEA 2026-12-02 15:00:00 → PHX 2026-12-02 18:52:00; layover at PHX: 163 minutes.
    • AA1841: PHX 2026-12-02 21:35:00 → ONT 2026-12-02 21:52:00.
  • Frontier Airlines F92275: ONT 2026-12-07 06:00:00 → SEA 2026-12-07 09:03:00; nonstop; 183 minutes. Local airport times.

2026-12-02 → 2026-12-07 · $319.00

  • Southwest Airlines WN3105 / WN1383: SEA 2026-12-02 08:05:00 → ONT 2026-12-02 12:40:00; 1 stop(s) via SJC; 275 minutes. Local airport times.
    • WN3105: SEA 2026-12-02 08:05:00 → SJC 2026-12-02 10:20:00; layover at SJC: 60 minutes.
    • WN1383: SJC 2026-12-02 11:20:00 → ONT 2026-12-02 12:40:00.
  • Southwest Airlines WN1053 / WN4083: ONT 2026-12-07 17:00:00 → SEA 2026-12-07 22:20:00; 1 stop(s) via LAS; 320 minutes. Local airport times.
    • WN1053: ONT 2026-12-07 17:00:00 → LAS 2026-12-07 18:05:00; layover at LAS: 85 minutes.
    • WN4083: LAS 2026-12-07 19:30:00 → SEA 2026-12-07 22:20:00.

2026-12-02 → 2026-12-07 · $359.00

  • United Airlines UA2478 / UA552: SEA 2026-12-02 15:24:00 → ONT 2026-12-02 22:53:00; 1 stop(s) via SFO; 449 minutes. Local airport times.
    • UA2478: SEA 2026-12-02 15:24:00 → SFO 2026-12-02 17:45:00; layover at SFO: 225 minutes.
    • UA552: SFO 2026-12-02 21:30:00 → ONT 2026-12-02 22:53:00.
  • United Airlines UA2363 / UA2192: ONT 2026-12-07 06:00:00 → SEA 2026-12-07 12:18:00; 1 stop(s) via SFO; 378 minutes. Local airport times.
    • UA2363: ONT 2026-12-07 06:00:00 → SFO 2026-12-07 07:30:00; layover at SFO: 155 minutes.
    • UA2192: SFO 2026-12-07 10:05:00 → SEA 2026-12-07 12:18:00.

2026-12-02 → 2026-12-07 · $279.00

  • Alaska Airlines AS489: SEA 2026-12-02 21:23:00 → ONT 2026-12-02 23:59:00; nonstop; 156 minutes. Local airport times.
  • Alaska Airlines AS571: ONT 2026-12-07 16:09:00 → SEA 2026-12-07 18:56:00; nonstop; 167 minutes. Local airport times.

2026-12-02 → 2026-12-07 · $195.00

  • Frontier Airlines F92408 / F91923: SEA 2026-12-02 11:53:00 → ONT 2026-12-02 18:31:00; 1 stop(s) via LAS; 398 minutes. Local airport times.
    • F92408: SEA 2026-12-02 11:53:00 → LAS 2026-12-02 14:32:00; layover at LAS: 173 minutes.
    • F91923: LAS 2026-12-02 17:25:00 → ONT 2026-12-02 18:31:00.
  • Frontier Airlines F92275: ONT 2026-12-07 06:00:00 → SEA 2026-12-07 09:03:00; nonstop; 183 minutes. Local airport times.

2026-12-02 → 2026-12-07 · $307.00

  • Alaska Airlines AS3087 / AS3380: SEA 2026-12-02 09:50:00 → ONT 2026-12-02 16:56:00; 1 stop(s) via BOI; 426 minutes. Local airport times.
    • AS3087: SEA 2026-12-02 09:50:00 → BOI 2026-12-02 12:21:00; layover at BOI: 199 minutes.
    • AS3380: BOI 2026-12-02 15:40:00 → ONT 2026-12-02 16:56:00.
  • Alaska Airlines AS571: ONT 2026-12-07 16:09:00 → SEA 2026-12-07 18:56:00; nonstop; 167 minutes. Local airport times.

2026-12-02 → 2026-12-07 · $317.00

  • Delta Air Lines DL1016 / DL3879: SEA 2026-12-02 09:18:00 → ONT 2026-12-02 16:22:00; 1 stop(s) via SLC; 424 minutes. Local airport times.
    • DL1016: SEA 2026-12-02 09:18:00 → SLC 2026-12-02 12:31:00; layover at SLC: 178 minutes.
    • DL3879: SLC 2026-12-02 15:29:00 → ONT 2026-12-02 16:22:00.
  • Delta Air Lines DL4031: ONT 2026-12-07 17:38:00 → SEA 2026-12-07 20:43:00; nonstop; 185 minutes. Local airport times.

More dates for this route