Quick Answer
Southwest is the best value ($100 UM fee) with multiple daily nonstops. American has PHX as a hub with tons of options. Flight time is only 1 hour 45 minutes - perfect for first-time UMs. Search this route →
Airlines Flying Phoenix to Denver for UMs
| Airline | UM Ages | Fee (each way) | Nonstop? |
|---|---|---|---|
| Southwest | 5-11 | $100 | ✅ Yes (many daily) |
| American | 5-14 | $150 | ✅ Yes (PHX hub) |
| United | 5-14 | $150 | ✅ Yes (DEN hub) |
| Spirit | 5-14 | $150 | ✅ Yes |
| Frontier | ❌ Does NOT accept unaccompanied minors | ||
⚠️ Frontier Warning
Frontier has heavy presence on PHX-DEN but does NOT accept UMs. Don't book Frontier for kids under 15.
Best Airline for PHX-DEN UM Flights
Best Value: Southwest
- $100/way vs $150 on others = $100 savings round trip
- Multiple daily nonstops
- No change fees - flexibility when plans change
- Two free checked bags
- PHX and DEN are both Southwest focus cities
For Ages 12-14: American or United
Southwest doesn't offer UM service for ages 12+, so choose:
- American: PHX is a hub, most flight options
- United: DEN is their biggest hub
Popular Custody Route
PHX-DEN is one of the most common custody exchange routes in the Mountain West. Tips:
- Short flight: Under 2 hours makes it easy on kids
- Same time zone: No jet lag issues
- Both airports easy: PHX and DEN are well-organized for UMs
- Frequent service: If one flight cancels, many alternatives
How to Book
- Southwest: 1-800-435-9792
- American: 1-800-433-7300
- United: 1-800-864-8331
- Spirit: 1-855-728-3555
