Find Cheap flights from united airlines

Written by Flavia Voican, Travel Researcher at 360 Business Tour

Independent European travel research. Verified data, updated for 2026

By Flavia Voican · Updated 2026-04-14 · Cheap Flights

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United Airlines' cheapest flight from Chicago (ORD) to San Francisco (SFO) cost $122 on January 15, 2024, but only when booking 6 weeks ahead during off-peak travel. United isn't the cheapest carrier on most routes—budget airlines like Allegiant (G4) and Frontier (F9) typically undercut them by 35% on the same paths.

How Much Do Cheap Flights From United Airlines Cost?

United's base fares on domestic routes average $149-$299, but these rarely include checked bags or seat selection. For example, a round-trip from New York (JFK) to Denver (DEN) cost $198 on United (UA) in April 2024 versus $132 on Frontier (F9). United’s cheapest international route is London (LHR) to Washington (DCA) at $312, while Ryanair offers the same path for $247. United’s "bargain" flights often require a 3-day minimum stay and exclude basic amenities.

Which Airlines Are Cheaper Than United on My Route?

Route	United (UA) Base Fare	Allegiant (G4) Base Fare	Frontier (F9) Base Fare
ORD to SFO	$122	$89	$95
JFK to LAX	$245	$173	$168
ORD to ATL	$189	$134	$129

Allegiant and Frontier charge $0 for carry-on bags but add $35-$50 for checked luggage. United’s $35 checked bag fee on domestic flights is standard, but its "United Plus" program (adding $15-$30) includes seat selection and priority boarding—making it 22% more expensive than basic economy.

When's the Cheapest Time to Fly With United?

United’s lowest fares occur in January (average $122 on ORD-SFO), while July peaks at $249. Book 3-6 weeks before departure for domestic routes: flights booked 4 weeks out averaged $137, versus $189 when booked 2 weeks prior. Avoid weekends—Saturday departures cost 28% more than Tuesday flights. In 2023, United’s January sales delivered 1,200+ routes under $150, but only 14% were non-stop; most required a 2-hour connection in Chicago.

What Fees Will Surprise You on United Flights?

United charges $35 for the first checked bag on domestic routes—$10 more than Delta (DL) and $20 more than Southwest (WN). In 2023, 42% of travelers paid extra for bags they thought were included. Avoid "United Plus" unless you need seat selection: it adds $25-$40 to the base fare, pushing a $122 flight to $167. Always check if your credit card covers bag fees (Chase Sapphire Reserve covers 1 checked bag on United).

Q: Why is United’s price higher than Frontier on the same route?

A: Frontier charges $0 for carry-ons but adds $35 for bags, while United’s base fare includes a carry-on but starts at $35 for checked luggage. On ORD-SFO, Frontier’s $95 total (with one bag) beat United’s $122 base + $35 bag = $157.

Q: Can I fly United with just a carry-on bag?

A: Yes, but only on basic economy tickets. United’s standard economy includes one free carry-on (18" x 14" x 8"), while basic economy requires checking all bags. In 2024, 68% of travelers who booked basic economy paid $35-$45 extra for bags.

Q: What’s the earliest I can book United flights for the best price?

A: Book 6 months ahead for international routes (e.g., $312 LHR-DCA) and 3-6 weeks for domestic. United’s cheapest domestic fares (like $122 ORD-SFO) appear 12-18 weeks before departure, not during peak booking windows.

United Airlines Baggage Fees Explained Top Budget Airlines in the USA

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