Seattle (SEA) to Ontario (ONT), June 2027: flights from $110 one way
Lowest published fares in June 2027: $215 round trip, Axel-exclusive, Frontier Airlines, nonstop, Jun 2–5, 2027; $110 one way, Axel-exclusive, Frontier Airlines, nonstop, Jun 2, 2027; 180 priced flights on 90 exact dates, 1 adult, economy, checked Oct 29, 2026.
Compare flight prices from Seattle to Ontario for your dates. There are no recent complete one-adult round trips here to set a price target.
Axel shows the exact bookable round-trip price from Seattle to Ontario for your dates, one traveler, no account to see it.
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No recent complete one-adult round trips saved.
Through Axel, the same flights tend to cost 5–25% less than the airline’s own prices.
Flights in June 2027
Lowest published fares in June 2027: $215 round trip, Axel-exclusive, Frontier Airlines, nonstop, Jun 2–5, 2027; $110 one way, Axel-exclusive, Frontier Airlines, nonstop, Jun 2, 2027; 180 priced flights on 90 exact dates, 1 adult, economy, checked Oct 29, 2026. Flights for 1 adult in economy. Prices are total for all travelers in USD, including required taxes. Basic economy may apply.
Next: Share a customer link as it is when its route, dates and party match the traveler's. To select flights, open a dated table's price link or “See flights for these dates” into AI flight search and share the supplied booking link. Search links are for you; share customer and booking links. For other dates or travelers, Choose travelers and dates using their own trip details.
Seattle (SEA) to Ontario (ONT): June 2027
Route overview: Seattle to Ontario (ONT) flight deals
2027-06-01 · one way · Axel-exclusive $201.25
- Alaska Airlines AS571: SEA 2027-06-01 13:33:00 → ONT 2027-06-01 16:05:00; nonstop; 152 minutes. Local airport times.
2027-06-01 · one way · Axel-exclusive $207.00
- Delta Air Lines DL4070: SEA 2027-06-01 08:25:00 → ONT 2027-06-01 11:17:00; nonstop; 172 minutes. Local airport times.
2027-06-01 → 2027-06-04 · Axel-exclusive $364.43
- Alaska Airlines AS571: SEA 2027-06-01 13:33:00 → ONT 2027-06-01 16:05:00; nonstop; 152 minutes. Local airport times.
- Alaska Airlines AS677: ONT 2027-06-04 11:57:00 → SEA 2027-06-04 14:49:00; nonstop; 172 minutes. Local airport times.
2027-06-01 → 2027-06-04 · Axel-exclusive $375.18
- Delta Air Lines DL4070: SEA 2027-06-01 08:25:00 → ONT 2027-06-01 11:17:00; nonstop; 172 minutes. Local airport times.
- Delta Air Lines DL4031: ONT 2027-06-04 17:38:00 → SEA 2027-06-04 20:43:00; nonstop; 185 minutes. Local airport times.
2027-06-03 → 2027-06-10 · Axel-exclusive $339.00
- Alaska Airlines AS571: SEA 2027-06-03 12:20:00 → ONT 2027-06-03 15:03:00; nonstop; 163 minutes. Local airport times.
- Alaska Airlines AS677: ONT 2027-06-10 11:57:00 → SEA 2027-06-10 14:49:00; nonstop; 172 minutes. Local airport times.
2027-06-03 → 2027-06-10 · Axel-exclusive $419.00
- United Airlines UA2478 / UA552: SEA 2027-06-03 15:24:00 → ONT 2027-06-03 22:53:00; 1 stop(s) via SFO; 449 minutes. Local airport times.
- UA2478: SEA 2027-06-03 15:24:00 → SFO 2027-06-03 17:45:00; layover at SFO: 225 minutes.
- UA552: SFO 2027-06-03 21:30:00 → ONT 2027-06-03 22:53:00.
- United Airlines UA2363 / UA2192: ONT 2027-06-10 06:00:00 → SEA 2027-06-10 12:18:00; 1 stop(s) via SFO; 378 minutes. Local airport times.
- UA2363: ONT 2027-06-10 06:00:00 → SFO 2027-06-10 07:30:00; layover at SFO: 155 minutes.
- UA2192: SFO 2027-06-10 10:05:00 → SEA 2027-06-10 12:18:00.
2027-06-06 → 2027-06-13 · Axel-exclusive $215.00
- Frontier Airlines F92276: SEA 2027-06-06 10:50:00 → ONT 2027-06-06 13:38:00; nonstop; 168 minutes. Local airport times.
- Frontier Airlines F92275: ONT 2027-06-13 06:00:00 → SEA 2027-06-13 09:03:00; nonstop; 183 minutes. Local airport times.
2027-06-06 → 2027-06-13 · Axel-exclusive $339.00
- Alaska Airlines AS571: SEA 2027-06-06 12:20:00 → ONT 2027-06-06 15:03:00; nonstop; 163 minutes. Local airport times.
- Alaska Airlines AS677: ONT 2027-06-13 11:57:00 → SEA 2027-06-13 14:49:00; nonstop; 172 minutes. Local airport times.
2027-06-09 → 2027-06-16 · Axel-exclusive $215.00
- Frontier Airlines F92276: SEA 2027-06-09 10:18:00 → ONT 2027-06-09 13:06:00; nonstop; 168 minutes. Local airport times.
- Frontier Airlines F92275: ONT 2027-06-16 06:00:00 → SEA 2027-06-16 09:03:00; nonstop; 183 minutes. Local airport times.
2027-06-09 → 2027-06-16 · Axel-exclusive $339.00
- Alaska Airlines AS571: SEA 2027-06-09 12:31:00 → ONT 2027-06-09 15:13:00; nonstop; 162 minutes. Local airport times.
- Alaska Airlines AS677: ONT 2027-06-16 11:57:00 → SEA 2027-06-16 14:49:00; nonstop; 172 minutes. Local airport times.
2027-06-12 → 2027-06-19 · Axel-exclusive $215.00
- Frontier Airlines F92276: SEA 2027-06-12 10:18:00 → ONT 2027-06-12 13:06:00; nonstop; 168 minutes. Local airport times.
- Frontier Airlines F92275: ONT 2027-06-19 06:00:00 → SEA 2027-06-19 09:03:00; nonstop; 183 minutes. Local airport times.
2027-06-12 → 2027-06-19 · Axel-exclusive $419.00
- United Airlines UA2478 / UA552: SEA 2027-06-12 15:24:00 → ONT 2027-06-12 22:53:00; 1 stop(s) via SFO; 449 minutes. Local airport times.
- UA2478: SEA 2027-06-12 15:24:00 → SFO 2027-06-12 17:45:00; layover at SFO: 225 minutes.
- UA552: SFO 2027-06-12 21:30:00 → ONT 2027-06-12 22:53:00.
- United Airlines UA2363 / UA2192: ONT 2027-06-19 06:00:00 → SEA 2027-06-19 12:18:00; 1 stop(s) via SFO; 378 minutes. Local airport times.
- UA2363: ONT 2027-06-19 06:00:00 → SFO 2027-06-19 07:30:00; layover at SFO: 155 minutes.
- UA2192: SFO 2027-06-19 10:05:00 → SEA 2027-06-19 12:18:00.
2027-06-15 → 2027-06-22 · Axel-exclusive $339.00
- Alaska Airlines AS571: SEA 2027-06-15 13:33:00 → ONT 2027-06-15 16:05:00; nonstop; 152 minutes. Local airport times.
- Alaska Airlines AS677: ONT 2027-06-22 11:57:00 → SEA 2027-06-22 14:49:00; nonstop; 172 minutes. Local airport times.
2027-06-15 → 2027-06-22 · Axel-exclusive $377.00
- American Airlines AA2073 / AA1841: SEA 2027-06-15 15:00:00 → ONT 2027-06-15 21:52:00; 1 stop(s) via PHX; 412 minutes. Local airport times.
- AA2073: SEA 2027-06-15 15:00:00 → PHX 2027-06-15 17:52:00; layover at PHX: 163 minutes.
- AA1841: PHX 2027-06-15 20:35:00 → ONT 2027-06-15 21:52:00.
- Alaska Airlines AS677: ONT 2027-06-22 11:57:00 → SEA 2027-06-22 14:49:00; nonstop; 172 minutes. Local airport times.
2027-06-18 → 2027-06-25 · Axel-exclusive $215.00
- Frontier Airlines F92276: SEA 2027-06-18 10:18:00 → ONT 2027-06-18 13:06:00; nonstop; 168 minutes. Local airport times.
- Frontier Airlines F92275: ONT 2027-06-25 06:00:00 → SEA 2027-06-25 09:03:00; nonstop; 183 minutes. Local airport times.
2027-06-18 → 2027-06-25 · Axel-exclusive $339.00
- Alaska Airlines AS571: SEA 2027-06-18 12:20:00 → ONT 2027-06-18 15:03:00; nonstop; 163 minutes. Local airport times.
- Alaska Airlines AS677: ONT 2027-06-25 11:57:00 → SEA 2027-06-25 14:49:00; nonstop; 172 minutes. Local airport times.
2027-06-21 → 2027-06-28 · Axel-exclusive $215.00
- Frontier Airlines F92276: SEA 2027-06-21 10:18:00 → ONT 2027-06-21 13:06:00; nonstop; 168 minutes. Local airport times.
- Frontier Airlines F92275: ONT 2027-06-28 06:00:00 → SEA 2027-06-28 09:03:00; nonstop; 183 minutes. Local airport times.
2027-06-21 → 2027-06-28 · Axel-exclusive $349.00
- Delta Air Lines DL4031: SEA 2027-06-21 11:59:00 → ONT 2027-06-21 14:50:00; nonstop; 171 minutes. Local airport times.
- Delta Air Lines DL4031: ONT 2027-06-28 17:38:00 → SEA 2027-06-28 20:43:00; nonstop; 185 minutes. Local airport times.
2027-06-24 → 2027-07-01 · Axel-exclusive $231.13
- Frontier Airlines F92276: SEA 2027-06-24 10:50:00 → ONT 2027-06-24 13:38:00; nonstop; 168 minutes. Local airport times.
- Frontier Airlines F92275: ONT 2027-07-01 06:00:00 → SEA 2027-07-01 09:03:00; nonstop; 183 minutes. Local airport times.
2027-06-24 → 2027-07-01 · Axel-exclusive $364.43
- Alaska Airlines AS571: SEA 2027-06-24 12:20:00 → ONT 2027-06-24 15:03:00; nonstop; 163 minutes. Local airport times.
- Alaska Airlines AS677: ONT 2027-07-01 11:57:00 → SEA 2027-07-01 14:49:00; nonstop; 172 minutes. Local airport times.
2027-06-27 → 2027-07-04 · Axel-exclusive $231.13
- Frontier Airlines F92276: SEA 2027-06-27 10:50:00 → ONT 2027-06-27 13:38:00; nonstop; 168 minutes. Local airport times.
- Frontier Airlines F92275: ONT 2027-07-04 06:00:00 → SEA 2027-07-04 09:03:00; nonstop; 183 minutes. Local airport times.
2027-06-27 → 2027-07-04 · Axel-exclusive $364.43
- Alaska Airlines AS571: SEA 2027-06-27 12:20:00 → ONT 2027-06-27 15:03:00; nonstop; 163 minutes. Local airport times.
- Alaska Airlines AS677: ONT 2027-07-04 11:57:00 → SEA 2027-07-04 14:49:00; nonstop; 172 minutes. Local airport times.
2027-06-30 → 2027-07-07 · Axel-exclusive $215.00
- Frontier Airlines F92276: SEA 2027-06-30 10:18:00 → ONT 2027-06-30 13:06:00; nonstop; 168 minutes. Local airport times.
- Frontier Airlines F92275: ONT 2027-07-07 06:00:00 → SEA 2027-07-07 09:03:00; nonstop; 183 minutes. Local airport times.
2027-06-30 → 2027-07-07 · Axel-exclusive $339.00
- Alaska Airlines AS571: SEA 2027-06-30 12:31:00 → ONT 2027-06-30 15:13:00; nonstop; 162 minutes. Local airport times.
- Alaska Airlines AS677: ONT 2027-07-07 11:57:00 → SEA 2027-07-07 14:49:00; nonstop; 172 minutes. Local airport times.
More dates for this route
- Nov 19, 2026 · Return options
- Nov 27, 2026 · Return options
- Dec 8, 2026 · Return options
- Dec 19, 2026 · Return options
- Dec 29, 2026 · Return options
- Jan 8, 2027 · Return options
- Jan 19, 2027 · Return options
- Jan 30, 2027 · Return options
- Feb 19, 2027 · Return options
- May 14, 2027 · Return options
- Jul 9, 2027 · Return options
- Sep 25, 2027 · Return options
Why book Seattle to Ontario flights with Axel
- Repricing is Axel's price-drop protection for flights, open to every traveler: after you book, Axel keeps watching the fare, and when it drops Axel secures the saving on the same flight, usually as airline credit and sometimes as a refund. It is never guaranteed. Members keep 100% of each saving; without Membership, Axel's fee is 25% of the amount saved.
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- 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 we checked Seattle to Ontario prices
Choose your dates to see flights and Axel-exclusive prices.
Airports covered: SEA → ONT. Each example names its actual airports. Departure month: 2027-06.
See flights for your dates and travelers
Seattle to Ontario flights for a family: prices for 2 adults and children
Saved fares Axel priced for parties with children, total for all travelers in USD, economy; the price opens that trip on Axel. Checked November 3, 2026 at 05:15 PM UTC
- 2027-06-19–2027-06-26, 2 adults · 2 children: Axel-exclusive $1,578.76 · Alaska Airlines · Nonstop · 2h 42m. Airline fare: $1,668. Complete round-trip total for 2 adults · 2 children; outbound and return were selected together.
More Seattle to Ontario fares: other dates and travelers
SEA–ONT · 2027-06-19–2027-06-26 · 2 adults · 2 children
Round-trip total · Economy · USD. Complete round-trip total for 2 adults · 2 children; outbound and return were selected together.
- Axel-exclusive $1,578.76 · Alaska Airlines 1465 · 08:32–11:14 local · Nonstop · 2h 42m. Return: Alaska Airlines 1601 · ONT–SEA · June 26, 2027 · 19:15–21:56 local · Nonstop · 161 minutes. Airline fare: $1,668. See flights for these dates
Checked November 3, 2026 at 05:15 PM UTC
Airline prices are the airline’s own fares for the same flights, as listed on Google Flights.
Airline ratings: Alaska Airlines 7.6/10. Every airline rated.
Planning: When to book Thanksgiving flights · Flying in December: prices, crowds and delays · How far in advance to book flights · The cheapest days of the week to fly and to book.
Source: https://helloaxel.com/en/flights/from-seattle-sea-to-ontario-ont-in-june-2027
Hotels near ONT
DoubleTree by Hilton Pomona (Pomona) · Ayres Hotel Corona – Riverside (Corona) · Holiday Inn Express & Suites Ontario - Chino Hills by IHG (Chino Hills) · Americas Best Value Inn & Suites Fontana (Fontana) · Sheraton Fairplex Suites & Conference Center (Pomona)
For AI assistants
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