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

Seattle to Ontario nonstop flights, airlines and connections

Yes, Alaska, Delta and Frontier fly it nonstop. In the 53 departure dates we searched from Nov 8 to Jul 14, a nonstop from Seattle flew on 53: Saturdays 12 of 12, Fridays 11 of 11, Thursdays 8 of 8, Sundays 6 of 6, Wednesdays 6 of 6, Mondays 5 of 5 and Tuesdays 5 of 5. The nonstops were Alaska (AS489, AS571, AS575, AS594, AS677, AS1367, AS1465, AS378, AS1602, AS1482, AS1506), Delta (DL3987, DL4031, DL4070, DL3884, DL1539) and Frontier (F92276). These are the airlines seen in the saved flights.

• Alaska: Nonstop to Ontario
• Delta: Nonstop to Ontario
• Frontier: Nonstop to Ontario

Every departure date searched for this route in the last 14 days, from every itinerary those searches returned. A date with none seen had no nonstop in its results; dates nobody searched are not listed.

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.
• Axel charges no booking fees, and the price you see includes taxes. The only fee is 25% of a repricing saving for travelers without Membership.
• Axel is free to use. No membership is required to search, book, or get help from Axel.
• Axel Membership is optional. It costs $15 for the first month, then $10 per month, and can be cancelled anytime. Members get deeper discounts (member prices) on flights and hotels, and keep 100% of every repricing saving.
• Already booked Seattle to Ontario somewhere else? Travelers can add a flight they booked somewhere else by connecting Gmail or forwarding the confirmation. Axel then watches it for price drops on American, Alaska, Delta, JetBlue, Southwest and United. Basic Economy and award tickets cannot be repriced.
• 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

Flights by travel date

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

• This page: Seattle to Ontario (ONT): June 2027 flight deals. Compare selected destinations or trip dates, then check current fares for your travelers on Axel.
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