Seattle (SEA) to Ontario (ONT), August 2027: flights from $110 one way
Lowest published fares in August 2027: $215 round trip, Axel-exclusive, Frontier Airlines, nonstop, Aug 1–4, 2027; $110 one way, Axel-exclusive, Frontier Airlines, nonstop, Aug 1, 2027; 72 priced flights on 36 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.
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Flights in August 2027
Lowest published fares in August 2027: $215 round trip, Axel-exclusive, Frontier Airlines, nonstop, Aug 1–4, 2027; $110 one way, Axel-exclusive, Frontier Airlines, nonstop, Aug 1, 2027; 72 priced flights on 36 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.
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Seattle (SEA) to Ontario (ONT): August 2027
Route overview: Seattle to Ontario (ONT) flight deals
2027-08-01 · one way · Axel-exclusive $110.00
- Frontier Airlines F92276: SEA 2027-08-01 10:50:00 → ONT 2027-08-01 13:38:00; nonstop; 168 minutes. Local airport times.
2027-08-01 · one way · Axel-exclusive $175.00
- Alaska Airlines AS571: SEA 2027-08-01 12:20:00 → ONT 2027-08-01 15:03:00; nonstop; 163 minutes. Local airport times.
2027-08-01 → 2027-08-04 · Axel-exclusive $215.00
- Frontier Airlines F92276: SEA 2027-08-01 10:50:00 → ONT 2027-08-01 13:38:00; nonstop; 168 minutes. Local airport times.
- Frontier Airlines F92275: ONT 2027-08-04 06:00:00 → SEA 2027-08-04 09:03:00; nonstop; 183 minutes. Local airport times.
2027-08-01 → 2027-08-04 · Axel-exclusive $339.00
- Alaska Airlines AS571: SEA 2027-08-01 12:20:00 → ONT 2027-08-01 15:03:00; nonstop; 163 minutes. Local airport times.
- Alaska Airlines AS677: ONT 2027-08-04 11:57:00 → SEA 2027-08-04 14:49:00; nonstop; 172 minutes. Local airport times.
2027-08-02 → 2027-08-05 · Axel-exclusive $215.00
- Frontier Airlines F92276: SEA 2027-08-02 10:18:00 → ONT 2027-08-02 13:06:00; nonstop; 168 minutes. Local airport times.
- Frontier Airlines F92275: ONT 2027-08-05 06:00:00 → SEA 2027-08-05 09:03:00; nonstop; 183 minutes. Local airport times.
2027-08-02 → 2027-08-05 · Axel-exclusive $349.00
- Delta Air Lines DL4031: SEA 2027-08-02 11:59:00 → ONT 2027-08-02 14:50:00; nonstop; 171 minutes. Local airport times.
- Delta Air Lines DL4031: ONT 2027-08-05 17:38:00 → SEA 2027-08-05 20:43:00; nonstop; 185 minutes. Local airport times.
2027-08-03 → 2027-08-06 · Axel-exclusive $339.00
- Alaska Airlines AS571: SEA 2027-08-03 13:33:00 → ONT 2027-08-03 16:05:00; nonstop; 152 minutes. Local airport times.
- Alaska Airlines AS677: ONT 2027-08-06 11:57:00 → SEA 2027-08-06 14:49:00; nonstop; 172 minutes. Local airport times.
2027-08-03 → 2027-08-06 · Axel-exclusive $382.00
- American Airlines AA2073 / AA1841: SEA 2027-08-03 15:00:00 → ONT 2027-08-03 21:52:00; 1 stop(s) via PHX; 412 minutes. Local airport times.
- AA2073: SEA 2027-08-03 15:00:00 → PHX 2027-08-03 17:52:00; layover at PHX: 163 minutes.
- AA1841: PHX 2027-08-03 20:35:00 → ONT 2027-08-03 21:52:00.
- Delta Air Lines DL4031: ONT 2027-08-06 17:38:00 → SEA 2027-08-06 20:43:00; nonstop; 185 minutes. Local airport times.
2027-08-04 → 2027-08-07 · Axel-exclusive $215.00
- Frontier Airlines F92276: SEA 2027-08-04 10:18:00 → ONT 2027-08-04 13:06:00; nonstop; 168 minutes. Local airport times.
- Frontier Airlines F92275: ONT 2027-08-07 06:00:00 → SEA 2027-08-07 09:03:00; nonstop; 183 minutes. Local airport times.
2027-08-04 → 2027-08-07 · Axel-exclusive $339.00
- Alaska Airlines AS571: SEA 2027-08-04 12:31:00 → ONT 2027-08-04 15:13:00; nonstop; 162 minutes. Local airport times.
- Alaska Airlines AS677: ONT 2027-08-07 11:57:00 → SEA 2027-08-07 14:49:00; nonstop; 172 minutes. Local airport times.
2027-08-05 → 2027-08-12 · Axel-exclusive $215.00
- Frontier Airlines F92276: SEA 2027-08-05 10:50:00 → ONT 2027-08-05 13:38:00; nonstop; 168 minutes. Local airport times.
- Frontier Airlines F92275: ONT 2027-08-12 06:00:00 → SEA 2027-08-12 09:03:00; nonstop; 183 minutes. Local airport times.
2027-08-05 → 2027-08-12 · Axel-exclusive $339.00
- Alaska Airlines AS571: SEA 2027-08-05 12:20:00 → ONT 2027-08-05 15:03:00; nonstop; 163 minutes. Local airport times.
- Alaska Airlines AS677: ONT 2027-08-12 11:57:00 → SEA 2027-08-12 14:49:00; nonstop; 172 minutes. Local airport times.
2027-08-06 → 2027-08-13 · Axel-exclusive $215.00
- Frontier Airlines F92276: SEA 2027-08-06 10:18:00 → ONT 2027-08-06 13:06:00; nonstop; 168 minutes. Local airport times.
- Frontier Airlines F92275: ONT 2027-08-13 06:00:00 → SEA 2027-08-13 09:03:00; nonstop; 183 minutes. Local airport times.
2027-08-06 → 2027-08-13 · Axel-exclusive $339.00
- Alaska Airlines AS571: SEA 2027-08-06 12:20:00 → ONT 2027-08-06 15:03:00; nonstop; 163 minutes. Local airport times.
- Alaska Airlines AS677: ONT 2027-08-13 11:57:00 → SEA 2027-08-13 14:49:00; nonstop; 172 minutes. Local airport times.
2027-08-07 → 2027-08-14 · Axel-exclusive $215.00
- Frontier Airlines F92276: SEA 2027-08-07 10:18:00 → ONT 2027-08-07 13:06:00; nonstop; 168 minutes. Local airport times.
- Frontier Airlines F92275: ONT 2027-08-14 06:00:00 → SEA 2027-08-14 09:03:00; nonstop; 183 minutes. Local airport times.
2027-08-07 → 2027-08-14 · Axel-exclusive $349.00
- Delta Air Lines DL4031: SEA 2027-08-07 11:59:00 → ONT 2027-08-07 14:50:00; nonstop; 171 minutes. Local airport times.
- Delta Air Lines DL4031: ONT 2027-08-14 17:38:00 → SEA 2027-08-14 20:43:00; nonstop; 185 minutes. Local airport times.
2027-08-09 → 2027-08-12 · Axel-exclusive $215.00
- Frontier Airlines F92276: SEA 2027-08-09 10:18:00 → ONT 2027-08-09 13:06:00; nonstop; 168 minutes. Local airport times.
- Frontier Airlines F92275: ONT 2027-08-12 06:00:00 → SEA 2027-08-12 09:03:00; nonstop; 183 minutes. Local airport times.
2027-08-09 → 2027-08-12 · Axel-exclusive $349.00
- Delta Air Lines DL4031: SEA 2027-08-09 11:59:00 → ONT 2027-08-09 14:50:00; nonstop; 171 minutes. Local airport times.
- Delta Air Lines DL4031: ONT 2027-08-12 17:38:00 → SEA 2027-08-12 20:43:00; nonstop; 185 minutes. Local airport times.
2027-08-10 → 2027-08-13 · Axel-exclusive $339.00
- Alaska Airlines AS571: SEA 2027-08-10 13:33:00 → ONT 2027-08-10 16:05:00; nonstop; 152 minutes. Local airport times.
- Alaska Airlines AS677: ONT 2027-08-13 11:57:00 → SEA 2027-08-13 14:49:00; nonstop; 172 minutes. Local airport times.
2027-08-10 → 2027-08-13 · Axel-exclusive $349.00
- Delta Air Lines DL4070: SEA 2027-08-10 08:25:00 → ONT 2027-08-10 11:17:00; nonstop; 172 minutes. Local airport times.
- Delta Air Lines DL4031: ONT 2027-08-13 17:38:00 → SEA 2027-08-13 20:43:00; nonstop; 185 minutes. Local airport times.
2027-08-11 → 2027-08-14 · Axel-exclusive $215.00
- Frontier Airlines F92276: SEA 2027-08-11 10:18:00 → ONT 2027-08-11 13:06:00; nonstop; 168 minutes. Local airport times.
- Frontier Airlines F92275: ONT 2027-08-14 06:00:00 → SEA 2027-08-14 09:03:00; nonstop; 183 minutes. Local airport times.
2027-08-11 → 2027-08-14 · Axel-exclusive $339.00
- Alaska Airlines AS571: SEA 2027-08-11 12:31:00 → ONT 2027-08-11 15:13:00; nonstop; 162 minutes. Local airport times.
- Alaska Airlines AS677: ONT 2027-08-14 11:57:00 → SEA 2027-08-14 14:49:00; nonstop; 172 minutes. Local airport times.
2027-08-12 → 2027-08-19 · Axel-exclusive $215.00
- Frontier Airlines F92276: SEA 2027-08-12 10:50:00 → ONT 2027-08-12 13:38:00; nonstop; 168 minutes. Local airport times.
- Frontier Airlines F92275: ONT 2027-08-19 06:00:00 → SEA 2027-08-19 09:03:00; nonstop; 183 minutes. Local airport times.
2027-08-12 → 2027-08-19 · Axel-exclusive $419.00
- United Airlines UA2478 / UA552: SEA 2027-08-12 15:24:00 → ONT 2027-08-12 22:53:00; 1 stop(s) via SFO; 449 minutes. Local airport times.
- UA2478: SEA 2027-08-12 15:24:00 → SFO 2027-08-12 17:45:00; layover at SFO: 225 minutes.
- UA552: SFO 2027-08-12 21:30:00 → ONT 2027-08-12 22:53:00.
- United Airlines UA2363 / UA2192: ONT 2027-08-19 06:00:00 → SEA 2027-08-19 12:18:00; 1 stop(s) via SFO; 378 minutes. Local airport times.
- UA2363: ONT 2027-08-19 06:00:00 → SFO 2027-08-19 07:30:00; layover at SFO: 155 minutes.
- UA2192: SFO 2027-08-19 10:05:00 → SEA 2027-08-19 12:18:00.
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 49 departure dates we searched from Nov 7 to Jul 14, a nonstop from Seattle flew on 49: Saturdays 11 of 11, Fridays 10 of 10, Thursdays 7 of 7, Sundays 6 of 6, Wednesdays 6 of 6, Tuesdays 5 of 5 and Mondays 4 of 4. The nonstops were Alaska (AS571, AS575, AS594, AS489, 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
| Departure date | Itineraries searched | Nonstop | Airlines and flights |
|---|---|---|---|
| Sat Nov 7 | 16 | yes | Alaska AS571, AS575, AS594; Delta DL3987, DL4031 |
| Sun Nov 8 | 55 | yes | Alaska AS489, AS571, AS575, AS594; Delta DL3987, DL4031, DL4070; Frontier F92276 |
| Mon Nov 9 | 66 | yes | Alaska AS489, AS571, AS575, AS594; Delta DL3987, DL4031, DL4070; Frontier F92276 |
| Wed Nov 11 | 577 | yes, both ways | Alaska AS571, AS575, AS594; Delta DL3987, DL4031, DL4070 |
| Thu Nov 12 | 874 | yes, both ways | Alaska AS489, AS571, AS575, AS594; Delta DL3987, DL4031, DL4070; Frontier F92276 |
| Fri Nov 13 | 218 | yes, both ways | Alaska AS489, AS571, AS575, AS594; Delta DL3987, DL4031, DL4070; Frontier F92276 |
| Sat Nov 14 | 246 | yes, both ways | Alaska AS571, AS575, AS594; Delta DL3987, DL4031 |
| Sun Nov 15 | 80 | yes | Alaska AS489, AS571, AS575, AS594; Delta DL3987, DL4031, DL4070; Frontier F92276 |
| Mon Nov 16 | 17 | yes | Alaska AS489, AS571, AS575, AS594; Delta DL3987, DL4031, DL4070; Frontier F92276 |
| Sat Nov 21 | 178 | yes, both ways | Alaska AS489, AS571, AS575; Delta DL3987, DL4031, DL4070; Frontier F92276 |
| Tue Nov 24 | 571 | yes, both ways | Alaska AS489, AS571, AS575, AS594; Delta DL3987, DL4031, DL4070; Frontier F92276 |
| Wed Nov 25 | 667 | yes, both ways | Alaska AS489, AS571, AS575, AS594; Delta DL3987, DL4031, DL4070; Frontier F92276 |
| Thu Nov 26 | 685 | yes, both ways | Alaska AS571, AS575; Delta DL4031; Frontier F92276 |
| Fri Nov 27 | 322 | yes, both ways | Alaska AS489, AS571, AS575, AS594; Delta DL4031; Frontier F92276 |
| Sat Nov 28 | 27 | yes | Alaska AS489, AS571, AS575; Delta DL3987, DL4031, DL4070; Frontier F92276 |
| Wed Dec 2 | 22 | yes | Alaska AS571, AS677; Delta DL3987, DL4031, DL4070 |
| Fri Dec 11 | 34 | yes, both ways | Alaska AS489, AS571, AS677; Delta DL3987, DL4031, DL4070 |
| Fri Dec 18 | 99 | yes | Alaska AS489, AS571, AS575, AS594; Delta DL3987, DL4031, DL4070 |
| Sat Dec 19 | 107 | yes | Alaska AS489, AS571, AS575; Delta DL3987, DL4031, DL4070 |
| Sun Dec 20 | 274 | yes | Alaska AS489, AS571, AS575, AS594; Delta DL3987, DL4031, DL4070 |
| Mon Dec 21 | 75 | yes | Alaska AS489, AS571, AS575, AS594; Delta DL3987, DL4031, DL4070 |
| Tue Dec 22 | 156 | yes | Alaska AS489, AS571, AS575, AS594; Delta DL3987, DL4031, DL4070 |
| Wed Dec 23 | 74 | yes | Alaska AS489, AS571, AS575, AS594; Delta DL3987, DL4031, DL4070 |
| Thu Dec 24 | 1151 | yes, both ways | Alaska AS571, AS575, AS594; Delta DL4031, DL4070 |
| Fri Dec 25 | 48 | yes | Alaska AS571, AS575, AS594; Delta DL4031, DL4070 |
| Sat Dec 26 | 694 | yes, both ways | Alaska AS489, AS571, AS575; Delta DL3987, DL4031, DL4070 |
| Sun Dec 27 | 35 | yes | Alaska AS489, AS571, AS575, AS594; Delta DL3987, DL4031, DL4070 |
| Mon Dec 28 | 29 | yes | Alaska AS489, AS571, AS575, AS594; Delta DL3987, DL4031, DL4070 |
| Tue Dec 29 | 21 | yes | Alaska AS489, AS571, AS575, AS594; Delta DL3987, DL4031, DL4070 |
| Fri Jan 8 | 124 | yes, both ways | Alaska AS489, AS571, AS677; Delta DL3884, DL4031 |
| Tue Jan 12 | 24 | yes | Alaska AS489, AS571, AS677; Delta DL3884 |
| Thu Jan 21 | 613 | yes, both ways | Alaska AS489, AS571, AS677; Delta DL3884, DL4031 |
| Fri Jan 22 | 1113 | yes, both ways | Alaska AS489, AS571, AS677; Delta DL3884, DL4031 |
| Thu Feb 4 | 122 | yes, both ways | Alaska AS489, AS571, AS677; Delta DL3884, DL4031 |
| Sun Feb 7 | 159 | yes | Alaska AS489, AS571, AS677; Delta DL3884, DL4031 |
| Thu Feb 11 | 73 | yes | Alaska AS1367, AS1465, AS378; Delta DL3884, DL4031 |
| Fri Feb 12 | 507 | yes | Alaska AS1367, AS1465, AS378; Delta DL3884, DL4031 |
| Sat Feb 13 | 18 | yes | Alaska AS1367, AS1465, AS378; Delta DL3884, DL4031 |
| Fri Mar 12 | 159 | yes | Alaska AS1367, AS1465, AS378; Delta DL3884, DL4031, DL4070 |
| Tue Mar 16 | 131 | yes | Alaska AS1367, AS1465, AS378; Delta DL3884, DL4031, DL4070 |
| Thu Mar 18 | 157 | yes, both ways | Alaska AS1367, AS1465, AS378; Delta DL3884, DL4031, DL4070 |
| Fri Mar 19 | 460 | yes, both ways | Alaska AS1367, AS1465, AS378; Delta DL3884, DL4031, DL4070 |
| Sat Mar 20 | 109 | yes, both ways | Alaska AS1367, AS1465, AS378; Delta DL3884, DL4031, DL4070 |
| Sun Apr 4 | 59 | yes | Alaska AS1367, AS1465, AS378; Delta DL4070 |
| Sat Jun 5 | 50 | yes | Alaska AS1367, AS1465, AS1602, AS378; Delta DL1539, DL3884, DL4031 |
| Wed Jun 9 | 85 | yes | Alaska AS1367, AS1465, AS1602, AS378; Delta DL3884, DL4031, DL4070 |
| Sat Jun 19 | 189 | yes, both ways | Alaska AS1465, AS1482, AS1506, AS1602, AS378; Delta DL3884, DL4031, DL4070 |
| Sat Jul 10 | 552 | yes, both ways | Alaska AS1465, AS1482, AS1506, AS1602, AS378; Delta DL3884, DL4031, DL4070 |
| Wed Jul 14 | 88 | yes | Alaska AS1465, AS1482, AS1506, AS1602, AS378; Delta DL3884, DL4031, DL4070 |
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.
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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: 2027-08.
See flights for your dates and travelers
More Seattle to Ontario fares: other dates and travelers
Airline prices are the airline’s own fares for the same flights, as listed on Google Flights.
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-august-2027
Hotels near ONT
Americas Best Value Inn Riverside (Riverside) · Pala Motel (Pomona) · Studio 6 Corona, CA - West (Corona) · Extended Stay America Suites Los Angeles Ontario Airport (Ontario) · TownePlace Suites by Marriott Ontario Chino Hills (Chino Hills)
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